Adding tools module to apex-pdp

The tools module contains the utility applications for apex
like converting policy model to cli, generating json events from policy
model, simple websocket client example etc.
The tools are defined to work in console and hence contain sysouts which
are actually needed.

Change-Id: Ia6d40fa7d3f6609ef86abd91a438d6ccbcd1f277
Issue-ID: POLICY-863
Signed-off-by: ramverma <ram.krishna.verma@ericsson.com>

11 files changed, 1518 insertions, 0 deletions

diff --git a/tools/model-generator/pom.xml b/tools/model-generator/pom.xml
new file mode 100644
index 000000000..2cdc7c20f
--- /dev/null
+++ b/tools/model-generator/pom.xml
@@ -0,0 +1,60 @@
+<!--
+  ============LICENSE_START=======================================================
+   Copyright (C) 2018 Ericsson. All rights reserved.
+  ================================================================================
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+  SPDX-License-Identifier: Apache-2.0
+  ============LICENSE_END=========================================================
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.onap.policy.apex-pdp.tools</groupId>
+        <artifactId>tools</artifactId>
+        <version>2.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>model-generator</artifactId>
+    <name>${project.artifactId}</name>
+    <description>[${project.parent.artifactId}] Apex generators from policy model</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.onap.policy.apex-pdp.tools</groupId>
+            <artifactId>tools-common</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.onap.policy.apex-pdp.model</groupId>
+            <artifactId>model-api</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.onap.policy.apex-pdp.services</groupId>
+            <artifactId>services-engine</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.onap.policy.apex-pdp.plugins.plugins-context.context-schema</groupId>
+            <artifactId>context-schema-avro</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.onap.policy.apex-pdp.auth</groupId>
+            <artifactId>cli-codegen</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+    </dependencies>
+</project>
\ No newline at end of file
diff --git a/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/KeyInfoGetter.java b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/KeyInfoGetter.java
new file mode 100644
index 000000000..a04ed49f3
--- /dev/null
+++ b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/KeyInfoGetter.java
@@ -0,0 +1,153 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.tools.model.generator;
+
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxKeyInfo;
+import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey;
+import org.onap.policy.apex.model.policymodel.concepts.AxPolicyModel;
+
+/**
+ * Getter methods for policy keys.
+ *
+ * @author John Keeney (john.keeney@ericsson.com)
+ */
+
+public class KeyInfoGetter {
+
+    /** The policy model for the getters. */
+    private final AxPolicyModel model;
+
+    /**
+     * Creates a new key getter.
+     *
+     * @param model the policy model to use
+     */
+    public KeyInfoGetter(final AxPolicyModel model) {
+        this.model = model;
+    }
+
+    /**
+     * Returns the key name as string.
+     *
+     * @param key the key to transform
+     * @return key name as string, null if key was null
+     */
+    public String getName(final AxArtifactKey key) {
+        if (key == null) {
+            return null;
+        }
+        return key.getName();
+    }
+
+    /**
+     * Returns the version of an artifact key.
+     *
+     * @param key the key to extract version from
+     * @return version of the key, null if key was null
+     */
+    public String getVersion(final AxArtifactKey key) {
+        if (key == null) {
+            return null;
+        }
+        return key.getVersion();
+    }
+
+    /**
+     * Returns the parent name for the key.
+     *
+     * @param key the key to process
+     * @return parent name, null if key was null
+     */
+    public String getPName(final AxReferenceKey key) {
+        if (key == null) {
+            return null;
+        }
+        return key.getParentKeyName();
+    }
+
+    /**
+     * Returns the parent version for the key.
+     *
+     * @param key the key to process
+     * @return parent version, null if key was null
+     */
+    public String getPVersion(final AxReferenceKey key) {
+        if (key == null) {
+            return null;
+        }
+        return key.getParentKeyVersion();
+    }
+
+    /**
+     * Returns the local name for the key.
+     *
+     * @param key the key to process
+     * @return local name, null if key was null
+     */
+    public String getLName(final AxReferenceKey key) {
+        if (key == null) {
+            return null;
+        }
+        return key.getLocalName();
+    }
+
+    /**
+     * Returns the local name of the parent for the key.
+     *
+     * @param key the key to process
+     * @return local name of the parent, null if key was null
+     */
+    public String getPLName(final AxReferenceKey key) {
+        if (key == null) {
+            return null;
+        }
+        return key.getParentLocalName();
+    }
+
+    /**
+     * Returns the UUID of an artifact key.
+     *
+     * @param key the key to extract version from
+     * @return UUID of the key, null if key was null
+     */
+    public String getUUID(final AxArtifactKey key) {
+        final AxKeyInfo ki = model.getKeyInformation().get(key);
+        if (ki == null || ki.getUUID() == null) {
+            return null;
+        }
+        return ki.getUUID().toString();
+    }
+
+    /**
+     * Returns the description of an artifact key.
+     *
+     * @param key the key to extract version from
+     * @return description of the key, null if key was null
+     */
+    public String getDesc(final AxArtifactKey key) {
+        final AxKeyInfo ki = model.getKeyInformation().get(key);
+        if (ki == null || ki.getDescription() == null) {
+            return null;
+        }
+        return ki.getDescription().toString();
+    }
+}
diff --git a/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/SchemaUtils.java b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/SchemaUtils.java
new file mode 100644
index 000000000..3a4feb049
--- /dev/null
+++ b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/SchemaUtils.java
@@ -0,0 +1,175 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.tools.model.generator;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.avro.AvroRuntimeException;
+import org.apache.avro.Schema;
+import org.apache.avro.Schema.Field;
+import org.apache.avro.reflect.ReflectData;
+import org.onap.policy.apex.context.SchemaHelper;
+import org.onap.policy.apex.context.impl.schema.SchemaHelperFactory;
+import org.onap.policy.apex.model.eventmodel.concepts.AxEvent;
+import org.onap.policy.apex.model.eventmodel.concepts.AxField;
+import org.onap.policy.apex.plugins.context.schema.avro.AvroSchemaHelper;
+import org.onap.policy.apex.service.engine.event.ApexEventException;
+
+/**
+ * Utility methods for schema handling.
+ *
+ * @author John Keeney (john.keeney@ericsson.com)
+ */
+public final class SchemaUtils {
+
+    /**
+     * Private constructor to avoid instantiation.
+     */
+    private SchemaUtils() {}
+
+    /**
+     * Returns the schema for an event.
+     *
+     * @param event the event to process
+     * @return the schema of the event
+     * @throws ApexEventException in any error case
+     */
+    public static Schema getEventSchema(final AxEvent event) throws ApexEventException {
+        final Schema skeletonSchema = Schema.createRecord(event.getKey().getName(), event.getNameSpace(),
+                "org.onap.policy.apex.model.eventmodel.events", false);
+
+        // Get the schema field for each parameter
+        final List<Field> fields = new ArrayList<>(getSkeletonEventSchemaFields());
+
+        final Map<String, Schema> preExistingParamSchemas = new LinkedHashMap<>();
+        for (final AxField parameter : event.getParameterMap().values()) {
+            final Schema fieldSchema = getEventParameterSchema(parameter, preExistingParamSchemas);
+            final Field f = new Field(parameter.getKey().getLocalName(), fieldSchema, (String) null, (Object) null);
+            fields.add(f);
+        }
+        skeletonSchema.setFields(fields);
+
+        return skeletonSchema;
+    }
+
+    /**
+     * Returns the schema fields as an array.
+     *
+     * @return an array with schema fields in the following order: nameSpace, name, version, source, target
+     */
+    public static List<Field> getSkeletonEventSchemaFields() {
+        // Fixed fields
+        final Field f1 = new Field("nameSpace", Schema.create(Schema.Type.STRING), (String) null, (Object) null);
+        final Field f2 = new Field("name", Schema.create(Schema.Type.STRING), (String) null, (Object) null);
+        final Field f3 = new Field("version", Schema.create(Schema.Type.STRING), (String) null, (Object) null);
+        final Field f4 = new Field("source", Schema.create(Schema.Type.STRING), (String) null, (Object) null);
+        final Field f5 = new Field("target", Schema.create(Schema.Type.STRING), (String) null, (Object) null);
+
+        return Arrays.asList(f1, f2, f3, f4, f5);
+    }
+
+    /**
+     * Returns the schema for an event parameter.
+     *
+     * @param parameter the parameter to process
+     * @param preexistingParamSchemas map of pre-existing schemas
+     * @return the schema for the event parameter
+     * @throws ApexEventException in case of any error
+     */
+    public static Schema getEventParameterSchema(final AxField parameter,
+            final Map<String, Schema> preexistingParamSchemas) throws ApexEventException {
+        final SchemaHelper schemaHelper =
+                new SchemaHelperFactory().createSchemaHelper(parameter.getKey(), parameter.getSchema().getKey());
+
+        Schema parameterSchema = null;
+        try {
+            if (schemaHelper instanceof AvroSchemaHelper) {
+                parameterSchema = ((AvroSchemaHelper) schemaHelper).getAvroSchema();
+            } else {
+                parameterSchema = ReflectData.get().getSchema(schemaHelper.getSchemaClass());
+            }
+        } catch (final AvroRuntimeException e) {
+            throw new ApexEventException("failed to decode a schema for parameter " + parameter.getKey().getLocalName()
+                    + " of type " + parameter.getSchema().getID() + " with Java type " + schemaHelper.getSchemaClass(),
+                    e);
+        }
+        final String schemaname = parameterSchema.getFullName();
+
+        // Get the Avro schema for this parameter, we need to keep track of sub-schemas for records because Avro does
+        // not
+        // allow re-declaration of sub-schema records of the same type. You simply reference the first sub-schema.
+        final Schema alreadyseen = preexistingParamSchemas.get(schemaname);
+
+        try {
+            processSubSchemas(parameterSchema, preexistingParamSchemas);
+        } catch (AvroRuntimeException | ApexEventException e) {
+            throw new ApexEventException("failed to decode a schema for parameter " + parameter.getKey().getLocalName()
+                    + " of type " + parameter.getSchema().getID() + " using Schema type " + schemaname, e);
+        }
+        if (alreadyseen != null) {
+            // logger.warn("parameter "+ parameter.getKey().getLocalName() + " of type " + parameter.getSchema().getID()
+            // + " tries to redfine AVRO type
+            // "+schemaname+", but it was previously defined. This parameter will use the previously defined version
+            // because AVRO does not support redefinition
+            // of types that have already been defined");
+            parameterSchema = alreadyseen;
+        }
+
+        return parameterSchema;
+    }
+
+    /**
+     * Processes a sub-schema.
+     *
+     * @param avroParameterSchema an AVRO schema to process
+     * @param map mapping of strings to schemas
+     * @throws ApexEventException in case of any error
+     */
+    public static void processSubSchemas(final Schema avroParameterSchema, final Map<String, Schema> map)
+            throws ApexEventException {
+        if (avroParameterSchema.getType() == Schema.Type.RECORD) {
+            final String schematypename = avroParameterSchema.getFullName();
+            final Schema alreadyregistered = map.get(schematypename);
+            if (alreadyregistered != null && !avroParameterSchema.equals(alreadyregistered)) {
+                throw new ApexEventException(
+                        "Parameter attempts to redefine type " + schematypename + " when it has already been defined");
+            }
+            map.put(schematypename, avroParameterSchema);
+            for (final Schema.Field f : avroParameterSchema.getFields()) {
+                final Schema fieldschema = f.schema();
+                processSubSchemas(fieldschema, map);
+            }
+        } else if (avroParameterSchema.getType() == Schema.Type.ARRAY) {
+            processSubSchemas(avroParameterSchema.getElementType(), map);
+        } else if (avroParameterSchema.getType() == Schema.Type.MAP) {
+            processSubSchemas(avroParameterSchema.getValueType(), map);
+        } else if (avroParameterSchema.getType() == Schema.Type.UNION) {
+            for (final Schema s : avroParameterSchema.getTypes()) {
+                processSubSchemas(s, map);
+            }
+        }
+    }
+
+}
diff --git a/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2cli/Application.java b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2cli/Application.java
new file mode 100644
index 000000000..236750310
--- /dev/null
+++ b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2cli/Application.java
@@ -0,0 +1,124 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.tools.model.generator.model2cli;
+
+import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.HelpFormatter;
+import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
+import org.onap.policy.apex.tools.common.CliOptions;
+import org.onap.policy.apex.tools.common.CliParser;
+import org.onap.policy.apex.tools.common.OutputFile;
+
+/**
+ * Process an Apex Policy Model file to generate the CLI commands to generate an equivalent Apex Policy Model.
+ *
+ * @author Sven van der Meer &lt;sven.van.der.meer@ericsson.com&gt;
+ */
+public final class Application {
+
+    /** The name of the application. */
+    public static final String APP_NAME = "gen-model2cli";
+
+    /** The description 1-liner of the application. */
+    public static final String APP_DESCRIPTION = "generates CLI Editor Commands from a policy model";
+
+    /**
+     * Private constructor to prevent instantiation.
+     */
+    private Application() {}
+
+    /**
+     * Main method to start the application.
+     *
+     * @param args the command line arguments
+     */
+    public static void main(final String[] args) {
+        final CliParser cli = new CliParser();
+        cli.addOption(CliOptions.HELP);
+        cli.addOption(CliOptions.VERSION);
+        cli.addOption(CliOptions.SKIPVALIDATION);
+        cli.addOption(CliOptions.MODELFILE);
+        cli.addOption(CliOptions.FILEOUT);
+        cli.addOption(CliOptions.OVERWRITE);
+
+        final CommandLine cmd = cli.parseCli(args);
+
+        // help is an exit option, print usage and exit
+        if (cmd.hasOption(CliOptions.HELP.getOpt())) {
+            final HelpFormatter formatter = new HelpFormatter();
+            System.out.println(APP_NAME + " v" + cli.getAppVersion() + " - " + APP_DESCRIPTION);
+            formatter.printHelp(APP_NAME, cli.getOptions());
+            System.out.println();
+            return;
+        }
+
+        // version is an exit option, print version and exit
+        if (cmd.hasOption(CliOptions.VERSION.getOpt())) {
+            System.out.println(APP_NAME + " " + cli.getAppVersion());
+            System.out.println();
+            return;
+        }
+
+        String modelFile = cmd.getOptionValue(CliOptions.MODELFILE.getOpt());
+        if (modelFile != null) {
+            modelFile = cmd.getOptionValue("model");
+        }
+        if (modelFile == null) {
+            System.err.println(APP_NAME + ": no '-" + CliOptions.MODELFILE.getOpt()
+                    + "' model file given, cannot proceed (try -h for help)");
+            return;
+        }
+
+        OutputFile outfile = null;
+        final String of = cmd.getOptionValue(CliOptions.FILEOUT.getOpt());
+        final boolean overwrite = cmd.hasOption(CliOptions.OVERWRITE.getOpt());
+        if (overwrite && of == null) {
+            System.err.println(APP_NAME + ": error with '-" + CliOptions.OVERWRITE.getOpt()
+                    + "' option. This option is only valid if a '-" + CliOptions.FILEOUT.getOpt()
+                    + "' option is also used. Cannot proceed (try -h for help)");
+            return;
+        }
+        if (of != null) {
+            outfile = new OutputFile(of, overwrite);
+            final String isoutfileok = outfile.validate();
+            if (isoutfileok != null) {
+                System.err.println(APP_NAME + ": error with '-" + CliOptions.FILEOUT.getOpt() + "' option: \""
+                        + isoutfileok + "\". Cannot proceed (try -h for help)");
+                return;
+            }
+        }
+
+        if (outfile == null) {
+            System.out.println();
+            System.out.println(APP_NAME + ": starting CLI generator");
+            System.out.println(" --> model file: " + modelFile);
+            System.out.println();
+            System.out.println();
+        }
+
+        try {
+            final Model2Cli app = new Model2Cli(modelFile, outfile, !cmd.hasOption("sv"), APP_NAME);
+            app.runApp();
+        } catch (final ApexException aex) {
+            System.err.println(APP_NAME + ": caught APEX exception with message: " + aex.getMessage());
+        }
+    }
+}
diff --git a/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2cli/Model2Cli.java b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2cli/Model2Cli.java
new file mode 100644
index 000000000..5117a2ecf
--- /dev/null
+++ b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2cli/Model2Cli.java
@@ -0,0 +1,463 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.tools.model.generator.model2cli;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Properties;
+
+import org.apache.commons.lang3.Validate;
+import org.onap.policy.apex.auth.clicodegen.CGCliEditor;
+import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextAlbum;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchema;
+import org.onap.policy.apex.model.eventmodel.concepts.AxEvent;
+import org.onap.policy.apex.model.eventmodel.concepts.AxField;
+import org.onap.policy.apex.model.modelapi.ApexAPIResult;
+import org.onap.policy.apex.model.modelapi.ApexModel;
+import org.onap.policy.apex.model.modelapi.ApexModelFactory;
+import org.onap.policy.apex.model.policymodel.concepts.AxPolicy;
+import org.onap.policy.apex.model.policymodel.concepts.AxPolicyModel;
+import org.onap.policy.apex.model.policymodel.concepts.AxState;
+import org.onap.policy.apex.model.policymodel.concepts.AxStateFinalizerLogic;
+import org.onap.policy.apex.model.policymodel.concepts.AxStateOutput;
+import org.onap.policy.apex.model.policymodel.concepts.AxStateTaskReference;
+import org.onap.policy.apex.model.policymodel.concepts.AxTask;
+import org.onap.policy.apex.model.policymodel.concepts.AxTaskLogic;
+import org.onap.policy.apex.model.policymodel.concepts.AxTaskParameter;
+import org.onap.policy.apex.model.policymodel.concepts.AxTaskSelectionLogic;
+import org.onap.policy.apex.tools.common.OutputFile;
+import org.onap.policy.apex.tools.model.generator.KeyInfoGetter;
+import org.stringtemplate.v4.ST;
+
+/**
+ * Takes a model and generates the JSON event schemas.
+ *
+ * @author Sven van der Meer (sven.van.der.meer@ericsson.com)
+ */
+public class Model2Cli {
+
+    /** Application name, used as prompt. */
+    private final String appName;
+
+    /** The file name of the policy model. */
+    private final String modelFile;
+
+    /** The output file, if any. */
+    private final OutputFile outFile;
+
+    /** Pre-validate the model. */
+    private final boolean validate;
+
+    /** utility for getting key information and parsing keys etc.. */
+    private KeyInfoGetter kig = null;
+
+    /**
+     * Creates a new model to CLI commands generator.
+     *
+     * @param modelFile the model file to be used
+     * @param outFile the out file
+     * @param validate true for model validation, false otherwise
+     * @param appName application name for printouts
+     */
+    public Model2Cli(final String modelFile, final OutputFile outFile, final boolean validate, final String appName) {
+        Validate.notNull(modelFile, "Model2Cli: given model file name was blank");
+        Validate.notNull(appName, "Model2Cli: given application name was blank");
+        this.modelFile = modelFile;
+        this.outFile = outFile;
+        this.appName = appName;
+        this.validate = validate;
+    }
+
+    /**
+     * Runs the application.
+     *
+     * @return status of the application execution, 0 for success, positive integer for exit condition (such as help or
+     *         version), negative integer for errors
+     * @throws ApexException if any problem occurred in the model
+     */
+    public int runApp() throws ApexException {
+        final CGCliEditor codeGen = new CGCliEditor();
+
+        final ApexModelFactory factory = new ApexModelFactory();
+        final ApexModel model = factory.createApexModel(new Properties(), true);
+
+        final ApexAPIResult result = model.loadFromFile(modelFile);
+        if (result.isNOK()) {
+            System.err.println(appName + ": " + result.getMessage());
+            return -1;
+        }
+
+        final AxPolicyModel policyModel = model.getPolicyModel();
+        policyModel.register();
+
+        if (validate) {
+            final AxValidationResult val = new AxValidationResult();
+            policyModel.validate(val);
+            if (!val.isOK()) {
+                System.err.println("Cannot translate the model. The model is not valid: \n" + val.toString());
+                return -1;
+            }
+        }
+
+        kig = new KeyInfoGetter(policyModel);
+
+        // Order is important. 0: model, 1: context schemas, 2: tasks, 3: events, 4: ContextAlbums, 5: Policies
+        // 0: model
+        final AxArtifactKey pmkey = policyModel.getKey();
+        codeGen.addModelParams(kig.getName(pmkey), kig.getVersion(pmkey), kig.getUUID(pmkey), kig.getDesc(pmkey));
+
+        // 1: Context Schemas
+        for (final AxContextSchema s : policyModel.getSchemas().getSchemasMap().values()) {
+            final AxArtifactKey key = s.getKey();
+
+            codeGen.addSchemaDeclaration(kig.getName(key), kig.getVersion(key), kig.getUUID(key), kig.getDesc(key),
+                    s.getSchemaFlavour(), s.getSchema());
+        }
+
+        // 2: tasks
+        for (final AxTask t : policyModel.getTasks().getTaskMap().values()) {
+            final AxArtifactKey key = t.getKey();
+            final List<ST> infields = getInfieldsForTask(codeGen, t);
+            final List<ST> outfields = getOutfieldsForTask(codeGen, t);
+            final ST logic = getLogicForTask(codeGen, t);
+            final List<ST> parameters = getParametersForTask(codeGen, t);
+            final List<ST> contextRefs = getCtxtRefsForTask(codeGen, t);
+
+            codeGen.addTaskDeclaration(kig.getName(key), kig.getVersion(key), kig.getUUID(key), kig.getDesc(key),
+                    infields, outfields, logic, parameters, contextRefs);
+        }
+
+        // 3: events
+        for (final AxEvent e : policyModel.getEvents().getEventMap().values()) {
+            final AxArtifactKey key = e.getKey();
+            final List<ST> fields = getParametersForEvent(codeGen, e);
+
+            codeGen.addEventDeclaration(kig.getName(key), kig.getVersion(key), kig.getUUID(key), kig.getDesc(key),
+                    e.getNameSpace(), e.getSource(), e.getTarget(), fields);
+        }
+
+        // 4: context albums
+        for (final AxContextAlbum a : policyModel.getAlbums().getAlbumsMap().values()) {
+            final AxArtifactKey key = a.getKey();
+
+            codeGen.addContextAlbumDeclaration(kig.getName(key), kig.getVersion(key), kig.getUUID(key),
+                    kig.getDesc(key), a.getScope(), a.isWritable(), kig.getName(a.getItemSchema()),
+                    kig.getVersion(a.getItemSchema()));
+        }
+
+        // 5: policies
+        for (final AxPolicy p : policyModel.getPolicies().getPolicyMap().values()) {
+            final AxArtifactKey key = p.getKey();
+            final List<ST> states = getStatesForPolicy(codeGen, p);
+            codeGen.addPolicyDefinition(kig.getName(key), kig.getVersion(key), kig.getUUID(key), kig.getDesc(key),
+                    p.getTemplate(), p.getFirstState(), states);
+        }
+
+        final String out = codeGen.getModel().render();
+        if (outFile != null) {
+            try {
+                final Writer w = outFile.toWriter();
+                if (w == null) {
+                    System.err.println("Error writing output to file " + outFile);
+                    return -1;
+                }
+                w.write(out);
+                w.close();
+            } catch (final IOException e) {
+                System.err.println("Error writing output to file " + outFile + ": " + e.getMessage());
+                return -1;
+            }
+        } else {
+            System.err.println(out);
+        }
+        return 0;
+    }
+
+    /**
+     * Gets the parameters for event.
+     *
+     * @param cg the code generator
+     * @param e the event
+     * @return the parameters for event
+     */
+    private List<ST> getParametersForEvent(final CGCliEditor cg, final AxEvent e) {
+        final Collection<AxField> fields = e.getFields();
+        final List<ST> ret = new ArrayList<>(fields.size());
+        for (final AxField f : fields) {
+            final AxReferenceKey fkey = f.getKey();
+
+            final ST val = cg.createEventFieldDefinition(kig.getPName(fkey), kig.getPVersion(fkey), kig.getLName(fkey),
+                    kig.getName(f.getSchema()), kig.getVersion(f.getSchema()), f.getOptional());
+
+            ret.add(val);
+        }
+        return ret;
+    }
+
+    /**
+     * Gets the context references for task.
+     *
+     * @param cg the code generator
+     * @param t the task
+     * @return the context references for task
+     */
+    private List<ST> getCtxtRefsForTask(final CGCliEditor cg, final AxTask t) {
+        final Collection<AxArtifactKey> ctxs = t.getContextAlbumReferences();
+        final List<ST> ret = new ArrayList<>(ctxs.size());
+        final AxArtifactKey tkey = t.getKey();
+        for (final AxArtifactKey ckey : ctxs) {
+
+            final ST val = cg.createTaskDefinitionContextRef(kig.getName(tkey), kig.getVersion(tkey), kig.getName(ckey),
+                    kig.getVersion(ckey));
+
+            ret.add(val);
+        }
+        return ret;
+    }
+
+    /**
+     * Gets the parameters for task.
+     *
+     * @param cg the code generator
+     * @param t the task
+     * @return the parameters for task
+     */
+    private List<ST> getParametersForTask(final CGCliEditor cg, final AxTask t) {
+        final Collection<AxTaskParameter> pars = t.getTaskParameters().values();
+        final List<ST> ret = new ArrayList<>(pars.size());
+        for (final AxTaskParameter p : pars) {
+            final AxReferenceKey pkey = p.getKey();
+
+            final ST val = cg.createTaskDefinitionParameters(kig.getPName(pkey), kig.getPVersion(pkey),
+                    kig.getLName(pkey), p.getTaskParameterValue());
+
+            ret.add(val);
+        }
+        return ret;
+    }
+
+    /**
+     * Gets the logic for task.
+     *
+     * @param cg the code generator
+     * @param t the task
+     * @return the logic for task
+     */
+    private ST getLogicForTask(final CGCliEditor cg, final AxTask t) {
+        final AxArtifactKey tkey = t.getKey();
+        final AxTaskLogic tl = t.getTaskLogic();
+
+        final ST val =
+                cg.createTaskDefLogic(kig.getName(tkey), kig.getVersion(tkey), tl.getLogicFlavour(), tl.getLogic());
+
+        return val;
+    }
+
+    /**
+     * Gets the output fields for task.
+     *
+     * @param cg the code generator
+     * @param t the task
+     * @return the output fields for task
+     */
+    private List<ST> getOutfieldsForTask(final CGCliEditor cg, final AxTask t) {
+        final Collection<? extends AxField> fields = t.getOutputFields().values();
+        final List<ST> ret = new ArrayList<>(fields.size());
+        for (final AxField f : fields) {
+            final AxReferenceKey fkey = f.getKey();
+
+            final ST val = cg.createTaskDefinitionOutfields(kig.getPName(fkey), kig.getPVersion(fkey),
+                    kig.getLName(fkey), kig.getName(f.getSchema()), kig.getVersion(f.getSchema()));
+
+            ret.add(val);
+        }
+        return ret;
+    }
+
+    /**
+     * Gets the input fields for task.
+     *
+     * @param cg the code generator
+     * @param t the task
+     * @return the input fields for task
+     */
+    private List<ST> getInfieldsForTask(final CGCliEditor cg, final AxTask t) {
+        final Collection<? extends AxField> fields = t.getInputFields().values();
+        final List<ST> ret = new ArrayList<>(fields.size());
+        for (final AxField f : fields) {
+            final AxReferenceKey fkey = f.getKey();
+
+            final ST val = cg.createTaskDefinitionInfields(kig.getPName(fkey), kig.getPVersion(fkey),
+                    kig.getLName(fkey), kig.getName(f.getSchema()), kig.getVersion(f.getSchema()));
+
+            ret.add(val);
+        }
+        return ret;
+    }
+
+    /**
+     * Gets the states for policy.
+     *
+     * @param cg the code generator
+     * @param p the policy
+     * @return the states for policy
+     */
+    private List<ST> getStatesForPolicy(final CGCliEditor cg, final AxPolicy p) {
+        final Collection<AxState> states = p.getStateMap().values();
+        final List<ST> ret = new ArrayList<>(states.size());
+        for (final AxState st : states) {
+            final AxReferenceKey skey = st.getKey();
+            final List<ST> outputs = getStateOutputsForState(cg, st);
+            final List<ST> finalizerLogics = getFinalizersForState(cg, st);
+            final List<ST> tasks = getTaskRefsForState(cg, st);
+            final List<ST> tsLogic = getTSLForState(cg, st);
+            final List<ST> ctxRefs = getCtxtRefsForState(cg, st);
+
+            final ST val = cg.createPolicyStateDef(kig.getPName(skey), kig.getPVersion(skey), kig.getLName(skey),
+                    kig.getName(st.getTrigger()), kig.getVersion(st.getTrigger()), kig.getName(st.getDefaultTask()),
+                    kig.getVersion(st.getDefaultTask()), outputs, tasks, tsLogic, finalizerLogics, ctxRefs);
+
+            ret.add(val);
+        }
+        return ret;
+    }
+
+    /**
+     * Gets the finalizers for state.
+     *
+     * @param cg the code generator
+     * @param st the state
+     * @return the finalizers for state
+     */
+    private List<ST> getFinalizersForState(final CGCliEditor cg, final AxState st) {
+        final Collection<AxStateFinalizerLogic> fins = st.getStateFinalizerLogicMap().values();
+        final List<ST> ret = new ArrayList<>(fins.size());
+        final AxReferenceKey skey = st.getKey();
+        for (final AxStateFinalizerLogic fin : fins) {
+            final AxReferenceKey finkey = fin.getKey();
+
+            final ST val = cg.createPolicyStateDefFinalizerLogic(kig.getPName(skey), kig.getPVersion(skey),
+                    kig.getLName(skey), kig.getLName(finkey), fin.getLogicFlavour(), fin.getLogic());
+
+            ret.add(val);
+        }
+        return ret;
+    }
+
+    /**
+     * Gets the context references for state.
+     *
+     * @param cg the code generator
+     * @param st the state
+     * @return the context references for state
+     */
+    private List<ST> getCtxtRefsForState(final CGCliEditor cg, final AxState st) {
+        final Collection<AxArtifactKey> ctxs = st.getContextAlbumReferences();
+        final List<ST> ret = new ArrayList<>(ctxs.size());
+        final AxReferenceKey skey = st.getKey();
+        for (final AxArtifactKey ctx : ctxs) {
+
+            final ST val = cg.createPolicyStateDefContextRef(kig.getPName(skey), kig.getPVersion(skey),
+                    kig.getLName(skey), kig.getName(ctx), kig.getVersion(ctx));
+
+            ret.add(val);
+        }
+        return ret;
+    }
+
+    /**
+     * Gets the Task Selection Logic for state.
+     *
+     * @param cg the code generator
+     * @param st the state
+     * @return the TSL for state (if any) in a list
+     */
+    private List<ST> getTSLForState(final CGCliEditor cg, final AxState st) {
+        final AxReferenceKey skey = st.getKey();
+        if (st.checkSetTaskSelectionLogic()) {
+            final AxTaskSelectionLogic tsl = st.getTaskSelectionLogic();
+            final ST val = cg.createPolicyStateDefTaskSelLogic(kig.getPName(skey), kig.getPVersion(skey),
+                    kig.getLName(skey), tsl.getLogicFlavour(), tsl.getLogic());
+            return Collections.singletonList(val);
+        } else {
+            return Collections.emptyList();
+        }
+    }
+
+    /**
+     * Gets the task references for state.
+     *
+     * @param cg the code generator
+     * @param st the state
+     * @return the task references for state
+     */
+    private List<ST> getTaskRefsForState(final CGCliEditor cg, final AxState st) {
+        final Map<AxArtifactKey, AxStateTaskReference> taskrefs = st.getTaskReferences();
+        final List<ST> ret = new ArrayList<>(taskrefs.size());
+        final AxReferenceKey skey = st.getKey();
+        for (final Entry<AxArtifactKey, AxStateTaskReference> e : taskrefs.entrySet()) {
+            final AxArtifactKey tkey = e.getKey();
+            final AxStateTaskReference tr = e.getValue();
+            final AxReferenceKey trkey = tr.getKey();
+
+            final ST val = cg.createPolicyStateTask(kig.getPName(skey), kig.getPVersion(skey), kig.getLName(skey),
+                    kig.getLName(trkey), kig.getName(tkey), kig.getVersion(tkey), tr.getStateTaskOutputType().name(),
+                    kig.getLName(tr.getOutput()));
+
+            ret.add(val);
+        }
+        return ret;
+    }
+
+    /**
+     * Gets the state outputs for state.
+     *
+     * @param cg the code generator
+     * @param st the state
+     * @return the state outputs for state
+     */
+    private List<ST> getStateOutputsForState(final CGCliEditor cg, final AxState st) {
+        final Collection<AxStateOutput> outs = st.getStateOutputs().values();
+        final List<ST> ret = new ArrayList<>(outs.size());
+        final AxReferenceKey skey = st.getKey();
+        for (final AxStateOutput out : outs) {
+            final AxReferenceKey outkey = out.getKey();
+
+            final ST val = cg.createPolicyStateOutput(kig.getPName(skey), kig.getPVersion(skey), kig.getLName(skey),
+                    kig.getLName(outkey), kig.getName(out.getOutgingEvent()), kig.getVersion(out.getOutgingEvent()),
+                    kig.getLName(out.getNextState()));
+
+            ret.add(val);
+        }
+        return ret;
+    }
+
+}
diff --git a/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2cli/package-info.java b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2cli/package-info.java
new file mode 100644
index 000000000..b8b3ffaef
--- /dev/null
+++ b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2cli/package-info.java
@@ -0,0 +1,27 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+/**
+ * An application generating CLI editor commands from a policy model.
+ *
+ * @author Sven van der Meer (sven.van.der.meer@ericsson.com)
+ */
+
+package org.onap.policy.apex.tools.model.generator.model2cli;
diff --git a/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2event/Application.java b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2event/Application.java
new file mode 100644
index 000000000..2bc70f69e
--- /dev/null
+++ b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2event/Application.java
@@ -0,0 +1,111 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.tools.model.generator.model2event;
+
+import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.HelpFormatter;
+import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
+import org.onap.policy.apex.tools.common.CliOptions;
+import org.onap.policy.apex.tools.common.CliParser;
+
+/**
+ * Model 2 event generator with main method.
+ *
+ * @author Sven van der Meer (sven.van.der.meer@ericsson.com)
+ */
+public final class Application {
+
+    /** The name of the application. */
+    public static final String APP_NAME = "gen-model2event";
+
+    /** The description 1-liner of the application. */
+    public static final String APP_DESCRIPTION = "generates JSON templates for events generated from a policy model";
+
+    /** Private constructor to prevent instantiation. */
+    private Application() {}
+
+    /**
+     * Main method to start the application.
+     *
+     * @param args the command line arguments
+     */
+    public static void main(final String[] args) {
+        final CliParser cli = new CliParser();
+        cli.addOption(CliOptions.HELP);
+        cli.addOption(CliOptions.VERSION);
+        cli.addOption(CliOptions.MODELFILE);
+        cli.addOption(CliOptions.TYPE);
+
+        final CommandLine cmd = cli.parseCli(args);
+
+        // help is an exit option, print usage and exit
+        if (cmd.hasOption('h') || cmd.hasOption("help")) {
+            final HelpFormatter formatter = new HelpFormatter();
+            System.out.println(APP_NAME + " v" + cli.getAppVersion() + " - " + APP_DESCRIPTION);
+            formatter.printHelp(APP_NAME, cli.getOptions());
+            System.out.println();
+            return;
+        }
+
+        // version is an exit option, print version and exit
+        if (cmd.hasOption('v') || cmd.hasOption("version")) {
+            System.out.println(APP_NAME + " " + cli.getAppVersion());
+            System.out.println();
+            return;
+        }
+
+        String modelFile = cmd.getOptionValue('m');
+        if (modelFile == null) {
+            modelFile = cmd.getOptionValue("model");
+        }
+        if (modelFile == null) {
+            System.err.println(APP_NAME + ": no model file given, cannot proceed (try -h for help)");
+            return;
+        }
+
+        String type = cmd.getOptionValue('t');
+        if (type == null) {
+            type = cmd.getOptionValue("type");
+        }
+        if (type == null) {
+            System.err.println(APP_NAME + ": no event type given, cannot proceed (try -h for help)");
+            return;
+        }
+        if (!type.equals("stimuli") && !type.equals("response") && !type.equals("internal")) {
+            System.err.println(APP_NAME + ": unknown type <" + type + ">, cannot proceed (try -h for help)");
+            return;
+        }
+
+        System.out.println();
+        System.out.println(APP_NAME + ": starting Event generator");
+        System.out.println(" --> model file: " + modelFile);
+        System.out.println(" --> type: " + type);
+        System.out.println();
+        System.out.println();
+
+        try {
+            final Model2JsonEventSchema app = new Model2JsonEventSchema(modelFile, type, APP_NAME);
+            app.runApp();
+        } catch (final ApexException aex) {
+            System.err.println(APP_NAME + ": caught APEX exception with message: " + aex.getMessage());
+        }
+    }
+}
diff --git a/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2event/Model2JsonEventSchema.java b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2event/Model2JsonEventSchema.java
new file mode 100644
index 000000000..ec6d72c4b
--- /dev/null
+++ b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2event/Model2JsonEventSchema.java
@@ -0,0 +1,265 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.tools.model.generator.model2event;
+
+import java.util.HashSet;
+import java.util.Properties;
+import java.util.Set;
+
+import org.apache.avro.Schema;
+import org.apache.avro.Schema.Field;
+import org.apache.commons.lang3.Validate;
+import org.onap.policy.apex.context.parameters.SchemaParameters;
+import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.onap.policy.apex.model.eventmodel.concepts.AxEvent;
+import org.onap.policy.apex.model.modelapi.ApexAPIResult;
+import org.onap.policy.apex.model.modelapi.ApexModel;
+import org.onap.policy.apex.model.modelapi.ApexModelFactory;
+import org.onap.policy.apex.model.policymodel.concepts.AxPolicies;
+import org.onap.policy.apex.model.policymodel.concepts.AxPolicy;
+import org.onap.policy.apex.model.policymodel.concepts.AxPolicyModel;
+import org.onap.policy.apex.model.policymodel.concepts.AxState;
+import org.onap.policy.apex.model.policymodel.concepts.AxStateOutput;
+import org.onap.policy.apex.plugins.context.schema.avro.AvroSchemaHelperParameters;
+import org.onap.policy.apex.tools.model.generator.SchemaUtils;
+import org.stringtemplate.v4.ST;
+import org.stringtemplate.v4.STGroup;
+import org.stringtemplate.v4.STGroupFile;
+
+/**
+ * Takes a model and generates the JSON event schemas.
+ *
+ * @author Sven van der Meer (sven.van.der.meer@ericsson.com)
+ */
+public class Model2JsonEventSchema {
+
+    /** Application name, used as prompt. */
+    private final String appName;
+
+    /** The file name of the policy model. */
+    private final String modelFile;
+
+    /** The type of events to generate: stimuli, response, internal. */
+    private final String type;
+
+    /**
+     * Creates a new model to event schema generator.
+     *
+     * @param modelFile the model file to be used
+     * @param type the type of events to generate, one of: stimuli, response, internal
+     * @param appName application name for printouts
+     */
+    public Model2JsonEventSchema(final String modelFile, final String type, final String appName) {
+        Validate.notNull(modelFile, "Model2JsonEvent: given model file name was blank");
+        Validate.notNull(type, "Model2JsonEvent: given type was blank");
+        Validate.notNull(appName, "Model2JsonEvent: given application name was blank");
+        this.modelFile = modelFile;
+        this.type = type;
+        this.appName = appName;
+    }
+
+    /**
+     * Adds a type to a field for a given schema.
+     *
+     * @param schema the schema to add a type for
+     * @param stg the STG
+     * @return a template with the type
+     */
+    protected ST addFieldType(final Schema schema, final STGroup stg) {
+        ST ret = null;
+        switch (schema.getType()) {
+            case BOOLEAN:
+            case BYTES:
+            case DOUBLE:
+            case FIXED:
+            case FLOAT:
+            case INT:
+            case LONG:
+            case STRING:
+                ret = stg.getInstanceOf("fieldTypeAtomic");
+                ret.add("type", schema.getType());
+                break;
+
+            case ARRAY:
+                ret = stg.getInstanceOf("fieldTypeArray");
+                ret.add("array", this.addFieldType(schema.getElementType(), stg));
+                break;
+            case ENUM:
+                ret = stg.getInstanceOf("fieldTypeEnum");
+                ret.add("symbols", schema.getEnumSymbols());
+                break;
+
+            case MAP:
+                ret = stg.getInstanceOf("fieldTypeMap");
+                ret.add("map", this.addFieldType(schema.getValueType(), stg));
+                break;
+
+            case RECORD:
+                ret = stg.getInstanceOf("fieldTypeRecord");
+                for (final Field field : schema.getFields()) {
+                    final ST st = stg.getInstanceOf("field");
+                    st.add("name", field.name());
+                    st.add("type", this.addFieldType(field.schema(), stg));
+                    ret.add("fields", st);
+                }
+                break;
+
+            case NULL:
+                break;
+            case UNION:
+                break;
+            default:
+                break;
+        }
+        return ret;
+    }
+
+    /**
+     * Runs the application.
+     *
+     * @throws ApexException if any problem occurred in the model
+     * @return status of the application execution, 0 for success, positive integer for exit condition (such as help or
+     *         version), negative integer for errors
+     */
+    public int runApp() throws ApexException {
+        final STGroupFile stg = new STGroupFile("org/onap/policy/apex/tools/model/generator/event-json.stg");
+        final ST stEvents = stg.getInstanceOf("events");
+
+        final ApexModelFactory factory = new ApexModelFactory();
+        final ApexModel model = factory.createApexModel(new Properties(), true);
+
+        final ApexAPIResult result = model.loadFromFile(modelFile);
+        if (result.isNOK()) {
+            System.err.println(appName + ": " + result.getMessage());
+            return -1;
+        }
+
+        final AxPolicyModel policyModel = model.getPolicyModel();
+        policyModel.register();
+        new SchemaParameters().getSchemaHelperParameterMap().put("Avro", new AvroSchemaHelperParameters());
+
+        final Set<AxEvent> events = new HashSet<>();
+        final Set<AxArtifactKey> eventKeys = new HashSet<>();
+        final AxPolicies policies = policyModel.getPolicies();
+        switch (type) {
+            case "stimuli":
+                for (final AxPolicy policy : policies.getPolicyMap().values()) {
+                    final String firsState = policy.getFirstState();
+                    for (final AxState state : policy.getStateMap().values()) {
+                        if (state.getKey().getLocalName().equals(firsState)) {
+                            eventKeys.add(state.getTrigger());
+                        }
+                    }
+                }
+                break;
+            case "response":
+                for (final AxPolicy policy : policies.getPolicyMap().values()) {
+                    for (final AxState state : policy.getStateMap().values()) {
+                        if (state.getNextStateSet().iterator().next().equals("NULL")) {
+                            for (final AxStateOutput output : state.getStateOutputs().values()) {
+                                eventKeys.add(output.getOutgingEvent());
+                            }
+                        }
+                    }
+                }
+                break;
+            case "internal":
+                for (final AxPolicy policy : policies.getPolicyMap().values()) {
+                    final String firsState = policy.getFirstState();
+                    for (final AxState state : policy.getStateMap().values()) {
+                        if (state.getKey().getLocalName().equals(firsState)) {
+                            continue;
+                        }
+                        if (state.getNextStateSet().iterator().next().equals("NULL")) {
+                            continue;
+                        }
+                        for (final AxStateOutput output : state.getStateOutputs().values()) {
+                            eventKeys.add(output.getOutgingEvent());
+                        }
+                    }
+                }
+                break;
+            default:
+                System.err.println(appName + ": unknown type <" + type + ">, cannot proceed");
+                return -1;
+        }
+
+        for (final AxEvent event : policyModel.getEvents().getEventMap().values()) {
+            for (final AxArtifactKey key : eventKeys) {
+                if (event.getKey().equals(key)) {
+                    events.add(event);
+                }
+            }
+        }
+
+        for (final AxEvent event : events) {
+            final ST stEvent = stg.getInstanceOf("event");
+            stEvent.add("name", event.getKey().getName());
+            stEvent.add("nameSpace", event.getNameSpace());
+            stEvent.add("version", event.getKey().getVersion());
+            stEvent.add("source", event.getSource());
+            stEvent.add("target", event.getTarget());
+
+            final Schema avro = SchemaUtils.getEventSchema(event);
+            for (final Field field : avro.getFields()) {
+                // filter magic names
+                switch (field.name()) {
+                    case "name":
+                    case "nameSpace":
+                    case "version":
+                    case "source":
+                    case "target":
+                        break;
+                    default:
+                        stEvent.add("fields", this.setField(field, stg));
+                }
+            }
+            stEvents.add("event", stEvent);
+        }
+        System.err.println(stEvents.render());
+        return 0;
+    }
+
+    /**
+     * Adds a field to the output.
+     *
+     * @param field the field from the event
+     * @param stg the STG
+     * @return a template for the field
+     */
+    protected ST setField(final Field field, final STGroup stg) {
+        final ST st = stg.getInstanceOf("field");
+        switch (field.name()) {
+            case "name":
+            case "nameSpace":
+            case "version":
+            case "source":
+            case "target":
+                break;
+            default:
+                st.add("name", field.name());
+                st.add("type", this.addFieldType(field.schema(), stg));
+        }
+        return st;
+    }
+
+}
diff --git a/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2event/package-info.java b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2event/package-info.java
new file mode 100644
index 000000000..602b4e9c9
--- /dev/null
+++ b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/model2event/package-info.java
@@ -0,0 +1,27 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+/**
+ * An application generating input/output event templates from a policy model.
+ *
+ * @author Sven van der Meer (sven.van.der.meer@ericsson.com)
+ */
+
+package org.onap.policy.apex.tools.model.generator.model2event;
diff --git a/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/package-info.java b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/package-info.java
new file mode 100644
index 000000000..1f60a18f3
--- /dev/null
+++ b/tools/model-generator/src/main/java/org/onap/policy/apex/tools/model/generator/package-info.java
@@ -0,0 +1,27 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+/**
+ * Applications that generate events and commands from policy models.
+ *
+ * @author Sven van der Meer (sven.van.der.meer@ericsson.com)
+ */
+
+package org.onap.policy.apex.tools.model.generator;
diff --git a/tools/model-generator/src/main/resources/org/onap/policy/apex/tools/model/generator/event-json.stg b/tools/model-generator/src/main/resources/org/onap/policy/apex/tools/model/generator/event-json.stg
new file mode 100644
index 000000000..9a6b8580b
--- /dev/null
+++ b/tools/model-generator/src/main/resources/org/onap/policy/apex/tools/model/generator/event-json.stg
@@ -0,0 +1,86 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+/*
+ * Template for creating a template JSON event.
+ *
+ * @package    org.onap.policy.apex.tool.model.generator
+ * @author     Sven van der Meer &lt;sven.van.der.meer@ericsson.com&gt;
+ */
+
+typeMap ::= [
+	"BOOLEAN":"###boolean: true, false###",
+	"BYTES":"###bytes###",
+	"DOUBLE":"###double: 0.0###",
+	"FLOAT":"###float: 0.0###",
+	"INT":"###integer: 0###",
+	"LONG":"###long: 0###",
+	"STRING":"\"###string###\"",
+	default:key
+]
+
+events(event) ::= <<
+<event:{e|<e>}; separator="\n\n">
+>>
+
+event(name, nameSpace, version, source, target, fields) ::= <<
+{
+	"name" : "<name>",
+	"nameSpace" : "<nameSpace>",
+	"version" : "<version>",
+	"source" : "<source>",
+	"target" : "<target>",
+	<fields:{field|<field>}; separator=",\n">
+}
+>>
+
+field(name, type) ::= <<
+"<name>" : <type>
+>>
+
+fieldTypeAtomic(type) ::= <<
+<typeMap.(type)>
+>>
+
+fieldTypeArray(array) ::= <<
+[
+	<typeMap.(array)>,
+	<typeMap.(array)>
+]
+>>
+
+fieldTypeEnum(symbols) ::= <<
+###Enum, one of <symbols>###
+>>
+
+fieldTypeMap(map) ::= <<
+{
+	"ID#1":
+		<map>,
+	"ID#n":
+		<map>
+}
+>>
+
+fieldTypeRecord(fields) ::= <<
+{
+	<fields:{field|<field>}; separator=",\n">
+}
+>>
\ No newline at end of file