Add serialization for Tosca Model

Added tests for Yaml policy monitoring
Added provider interface calls in provider and structure for handling legacy APIs.

Issue-ID: POLICY-1195
Change-Id: I4825272e0713b9e6a4b89753828de8905bcffbd1
Signed-off-by: liamfallon <liam.fallon@est.tech>

10 files changed, 545 insertions, 5 deletions

diff --git a/models-tosca/src/main/java/org/onap/policy/models/tosca/concepts/ToscaTopologyTemplate.java b/models-tosca/src/main/java/org/onap/policy/models/tosca/concepts/ToscaTopologyTemplate.java
index e8541f514..aed181f94 100644
--- a/models-tosca/src/main/java/org/onap/policy/models/tosca/concepts/ToscaTopologyTemplate.java
+++ b/models-tosca/src/main/java/org/onap/policy/models/tosca/concepts/ToscaTopologyTemplate.java
@@ -38,8 +38,8 @@ import lombok.NonNull;
 import org.apache.commons.lang3.ObjectUtils;
 import org.onap.policy.common.utils.validation.Assertions;
 import org.onap.policy.models.base.PfConcept;
-import org.onap.policy.models.base.PfConceptKey;
 import org.onap.policy.models.base.PfKey;
+import org.onap.policy.models.base.PfReferenceKey;
 import org.onap.policy.models.base.PfValidationMessage;
 import org.onap.policy.models.base.PfValidationResult;
 import org.onap.policy.models.base.PfValidationResult.ValidationResult;
@@ -59,7 +59,7 @@ public class ToscaTopologyTemplate extends PfConcept {
     private static final long serialVersionUID = 8969698734673232603L;
 
     @EmbeddedId
-    private PfConceptKey key;
+    private PfReferenceKey key;
 
     @Column(name = "description")
     private String description;
@@ -71,7 +71,7 @@ public class ToscaTopologyTemplate extends PfConcept {
      * The Default Constructor creates a {@link ToscaTopologyTemplate} object with a null key.
      */
     public ToscaTopologyTemplate() {
-        this(new PfConceptKey());
+        this(new PfReferenceKey());
     }
 
     /**
@@ -80,7 +80,7 @@ public class ToscaTopologyTemplate extends PfConcept {
      *
      * @param key the key
      */
-    public ToscaTopologyTemplate(@NonNull final PfConceptKey key) {
+    public ToscaTopologyTemplate(@NonNull final PfReferenceKey key) {
         this.key = key;
     }
 
@@ -169,7 +169,7 @@ public class ToscaTopologyTemplate extends PfConcept {
         Assertions.instanceOf(copyObject, PfConcept.class);
 
         final ToscaTopologyTemplate copy = ((ToscaTopologyTemplate) copyObject);
-        copy.setKey(new PfConceptKey(key));
+        copy.setKey(new PfReferenceKey(key));
         copy.setDescription(description);
         copy.setPolicies(policies != null ? new ToscaPolicies(policies) : null);
 
diff --git a/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyGuardMessageBodyHandler.java b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyGuardMessageBodyHandler.java
new file mode 100644
index 000000000..b343c9e66
--- /dev/null
+++ b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyGuardMessageBodyHandler.java
@@ -0,0 +1,56 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.models.tosca.serialization.legacy;
+
+import com.google.gson.GsonBuilder;
+
+import org.onap.policy.common.gson.GsonMessageBodyHandler;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Provider used to serialize and deserialize TOSCA objects using GSON.
+ */
+public class LegacyGuardMessageBodyHandler extends GsonMessageBodyHandler {
+
+    public static final Logger logger = LoggerFactory.getLogger(LegacyGuardMessageBodyHandler.class);
+
+    /**
+     * Constructs the object.
+     */
+    public LegacyGuardMessageBodyHandler() {
+        this(new GsonBuilder());
+
+        logger.info("Using GSON with TOSCA for REST calls");
+    }
+
+    /**
+     * Constructs the object.
+     *
+     * @param builder builder to use to create the gson object
+     */
+    public LegacyGuardMessageBodyHandler(final GsonBuilder builder) {
+        // @formatter:off
+        super(builder
+                .create()
+        );
+        // @formatter:on
+    }
+
+}
diff --git a/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyGuardPolicy.java b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyGuardPolicy.java
new file mode 100644
index 000000000..a365696c3
--- /dev/null
+++ b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyGuardPolicy.java
@@ -0,0 +1,30 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.models.tosca.serialization.legacy;
+
+/**
+ * Definition of a legacy guard policy stored as a TOSCA policy.
+ *
+ * @author Liam Fallon (liam.fallon@est.tech)
+ */
+public class LegacyGuardPolicy {
+
+}
diff --git a/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyOperationalMessageBodyHandler.java b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyOperationalMessageBodyHandler.java
new file mode 100644
index 000000000..f51a427f0
--- /dev/null
+++ b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyOperationalMessageBodyHandler.java
@@ -0,0 +1,56 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.models.tosca.serialization.legacy;
+
+import com.google.gson.GsonBuilder;
+
+import org.onap.policy.common.gson.GsonMessageBodyHandler;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Provider used to serialize and deserialize TOSCA objects using GSON.
+ */
+public class LegacyOperationalMessageBodyHandler extends GsonMessageBodyHandler {
+
+    public static final Logger logger = LoggerFactory.getLogger(LegacyOperationalMessageBodyHandler.class);
+
+    /**
+     * Constructs the object.
+     */
+    public LegacyOperationalMessageBodyHandler() {
+        this(new GsonBuilder());
+
+        logger.info("Using GSON with TOSCA for REST calls");
+    }
+
+    /**
+     * Constructs the object.
+     *
+     * @param builder builder to use to create the gson object
+     */
+    public LegacyOperationalMessageBodyHandler(final GsonBuilder builder) {
+        // @formatter:off
+        super(builder
+                .create()
+        );
+        // @formatter:on
+    }
+
+}
diff --git a/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyOperationalPolicy.java b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyOperationalPolicy.java
new file mode 100644
index 000000000..0b63f2d68
--- /dev/null
+++ b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/legacy/LegacyOperationalPolicy.java
@@ -0,0 +1,30 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.models.tosca.serialization.legacy;
+
+/**
+ * Definition of a legacy operational policy stored as a TOSCA policy.
+ *
+ * @author Liam Fallon (liam.fallon@est.tech)
+ */
+public class LegacyOperationalPolicy {
+
+}
diff --git a/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaPoliciesJsonAdapter.java b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaPoliciesJsonAdapter.java
new file mode 100644
index 000000000..a12ba8be9
--- /dev/null
+++ b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaPoliciesJsonAdapter.java
@@ -0,0 +1,72 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.models.tosca.serialization.simple;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+
+import java.lang.reflect.Type;
+import java.util.Iterator;
+
+import lombok.NonNull;
+
+import org.onap.policy.models.base.PfConceptKey;
+import org.onap.policy.models.tosca.concepts.ToscaPolicies;
+import org.onap.policy.models.tosca.concepts.ToscaPolicy;
+
+/**
+ * GSON type adapter for TOSCA policies.
+ *
+ * @author Liam Fallon (liam.fallon@est.tech)
+ */
+public class ToscaPoliciesJsonAdapter implements JsonSerializer<ToscaPolicies>, JsonDeserializer<ToscaPolicies> {
+    @Override
+    public ToscaPolicies deserialize(@NonNull final JsonElement policiesElement, @NonNull final Type type,
+            @NonNull final JsonDeserializationContext context) {
+        // The incoming JSON
+        final JsonArray policiesJsonArray = policiesElement.getAsJsonArray();
+
+        // The outgoing object
+        final PfConceptKey policiesKey = new PfConceptKey("IncomingPolicies", "0.0.1");
+        final ToscaPolicies policies = new ToscaPolicies(policiesKey);
+
+        // Get the policies
+        for (Iterator<JsonElement> policiesIterator = policiesJsonArray.iterator(); policiesIterator.hasNext(); ) {
+            ToscaPolicy policy = new ToscaPolicyJsonAdapter()
+                    .deserialize(policiesIterator.next(), ToscaPolicy.class, context);
+
+            policies.getConceptMap().put(policy.getKey(), policy);
+        }
+
+        return policies;
+    }
+
+    @Override
+    public JsonElement serialize(@NonNull final ToscaPolicies policy, @NonNull final Type type,
+            @NonNull final JsonSerializationContext context) {
+
+        return null;
+    }
+}
diff --git a/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaPolicyJsonAdapter.java b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaPolicyJsonAdapter.java
new file mode 100644
index 000000000..ae5e596ba
--- /dev/null
+++ b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaPolicyJsonAdapter.java
@@ -0,0 +1,85 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.models.tosca.serialization.simple;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+
+import java.lang.reflect.Type;
+
+import javax.ws.rs.core.Response;
+
+import lombok.NonNull;
+
+import org.onap.policy.models.base.PfConceptKey;
+import org.onap.policy.models.base.PfModelRuntimeException;
+import org.onap.policy.models.tosca.concepts.ToscaPolicy;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * GSON type adapter for TOSCA policies.
+ *
+ * @author Liam Fallon (liam.fallon@est.tech)
+ */
+public class ToscaPolicyJsonAdapter implements JsonSerializer<ToscaPolicy>, JsonDeserializer<ToscaPolicy> {
+    // Logger for this class
+    private static final Logger LOGGER = LoggerFactory.getLogger(ToscaPolicyJsonAdapter.class);
+
+    @Override
+    public ToscaPolicy deserialize(@NonNull final JsonElement policyElement, @NonNull final Type type,
+            @NonNull final JsonDeserializationContext context) {
+
+        // The incoming JSON
+        final JsonObject policyJsonMapObject = policyElement.getAsJsonObject();
+
+        // We should only have a single entry for the policy
+        if (policyJsonMapObject.entrySet().size() != 1) {
+            String errorMessage = "a policy list entry may only contain one and only one policy";
+            LOGGER.debug(errorMessage);
+            throw new PfModelRuntimeException(Response.Status.NOT_ACCEPTABLE, errorMessage);
+        }
+
+        String policyName = policyJsonMapObject.entrySet().iterator().next().getKey();
+        JsonObject policyJsonObject = policyJsonMapObject.entrySet().iterator().next().getValue().getAsJsonObject();
+
+        PfConceptKey policyKey = new PfConceptKey(policyName, policyJsonObject.get("version").getAsString());
+        PfConceptKey policyTypeKey = new PfConceptKey(
+                policyJsonObject.get("type").getAsString(),
+                policyJsonObject.get("version").getAsString());
+        ToscaPolicy policy = new ToscaPolicy(policyKey, policyTypeKey);
+
+        // TODO: Rest of parsing
+
+        return policy;
+    }
+
+    @Override
+    public JsonElement serialize(@NonNull final ToscaPolicy policy, @NonNull final Type type,
+            @NonNull final JsonSerializationContext context) {
+
+        return null;
+    }
+}
diff --git a/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaServiceTemplateJsonAdapter.java b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaServiceTemplateJsonAdapter.java
new file mode 100644
index 000000000..b08a33d64
--- /dev/null
+++ b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaServiceTemplateJsonAdapter.java
@@ -0,0 +1,75 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.models.tosca.serialization.simple;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+
+import java.lang.reflect.Type;
+
+import lombok.NonNull;
+
+import org.onap.policy.models.base.PfConceptKey;
+import org.onap.policy.models.tosca.concepts.ToscaServiceTemplate;
+import org.onap.policy.models.tosca.concepts.ToscaTopologyTemplate;
+
+/**
+ * GSON type adapter for TOSCA policies.
+ *
+ * @author Liam Fallon (liam.fallon@est.tech)
+ */
+public class ToscaServiceTemplateJsonAdapter
+        implements JsonSerializer<ToscaServiceTemplate>, JsonDeserializer<ToscaServiceTemplate> {
+    @Override
+    public ToscaServiceTemplate deserialize(@NonNull final JsonElement serviceTemplateElement, @NonNull final Type type,
+            @NonNull final JsonDeserializationContext context) {
+
+        // The incoming JSON
+        final JsonObject serviceTemplateJsonObject = serviceTemplateElement.getAsJsonObject();
+
+        // The outgoing object
+        final PfConceptKey serviceTemplateKey = new PfConceptKey("IncomingServiceTemplate", "0.0.1");
+        final ToscaServiceTemplate serviceTemplate = new ToscaServiceTemplate(serviceTemplateKey);
+        serviceTemplate
+                .setToscaDefinitionsVersion(serviceTemplateJsonObject.get("tosca_definitions_version").getAsString());
+
+        if (serviceTemplateJsonObject.has("topology_template")) {
+            serviceTemplate.setTopologyTemplate(new ToscaTopologyTemplateJsonAdapter().deserialize(
+                    serviceTemplateJsonObject.get("topology_template"), ToscaTopologyTemplate.class, context));
+        }
+
+        // Set the parent key of the topology template to be this service template
+        serviceTemplate.getTopologyTemplate().getKey().setParentConceptKey(serviceTemplateKey);
+
+        return serviceTemplate;
+    }
+
+    @Override
+    public JsonElement serialize(@NonNull final ToscaServiceTemplate serviceTemplate, @NonNull final Type type,
+            @NonNull final JsonSerializationContext context) {
+
+        return null;
+    }
+}
diff --git a/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaServiceTemplateMessageBodyHandler.java b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaServiceTemplateMessageBodyHandler.java
new file mode 100644
index 000000000..9abbf1c72
--- /dev/null
+++ b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaServiceTemplateMessageBodyHandler.java
@@ -0,0 +1,64 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.models.tosca.serialization.simple;
+
+import com.google.gson.GsonBuilder;
+
+import org.onap.policy.common.gson.GsonMessageBodyHandler;
+import org.onap.policy.models.tosca.concepts.ToscaPolicies;
+import org.onap.policy.models.tosca.concepts.ToscaPolicy;
+import org.onap.policy.models.tosca.concepts.ToscaServiceTemplate;
+import org.onap.policy.models.tosca.concepts.ToscaTopologyTemplate;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Provider used to serialize and deserialize TOSCA objects using GSON.
+ */
+public class ToscaServiceTemplateMessageBodyHandler extends GsonMessageBodyHandler {
+
+    public static final Logger logger = LoggerFactory.getLogger(ToscaServiceTemplateMessageBodyHandler.class);
+
+    /**
+     * Constructs the object.
+     */
+    public ToscaServiceTemplateMessageBodyHandler() {
+        this(new GsonBuilder());
+
+        logger.info("Using GSON with TOSCA for REST calls");
+    }
+
+    /**
+     * Constructs the object.
+     *
+     * @param builder builder to use to create the gson object
+     */
+    public ToscaServiceTemplateMessageBodyHandler(final GsonBuilder builder) {
+        // @formatter:off
+        super(builder
+                .registerTypeAdapter(ToscaServiceTemplate.class, new ToscaServiceTemplateJsonAdapter())
+                .registerTypeAdapter(ToscaTopologyTemplate.class, new ToscaTopologyTemplateJsonAdapter())
+                .registerTypeAdapter(ToscaPolicies.class, new ToscaPoliciesJsonAdapter())
+                .registerTypeAdapter(ToscaPolicy.class, new ToscaPolicyJsonAdapter())
+                .create()
+        );
+        // @formatter:on
+    }
+
+}
diff --git a/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaTopologyTemplateJsonAdapter.java b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaTopologyTemplateJsonAdapter.java
new file mode 100644
index 000000000..4f2f590b7
--- /dev/null
+++ b/models-tosca/src/main/java/org/onap/policy/models/tosca/serialization/simple/ToscaTopologyTemplateJsonAdapter.java
@@ -0,0 +1,72 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.models.tosca.serialization.simple;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+
+import java.lang.reflect.Type;
+
+import lombok.NonNull;
+
+import org.onap.policy.models.base.PfConceptKey;
+import org.onap.policy.models.base.PfReferenceKey;
+import org.onap.policy.models.tosca.concepts.ToscaPolicies;
+import org.onap.policy.models.tosca.concepts.ToscaTopologyTemplate;
+
+/**
+ * GSON type adapter for TOSCA policies.
+ *
+ * @author Liam Fallon (liam.fallon@est.tech)
+ */
+public class ToscaTopologyTemplateJsonAdapter
+        implements JsonSerializer<ToscaTopologyTemplate>, JsonDeserializer<ToscaTopologyTemplate> {
+
+    @Override
+    public ToscaTopologyTemplate deserialize(@NonNull final JsonElement toplogyTemplateElement,
+            @NonNull final Type type, @NonNull final JsonDeserializationContext context) {
+
+        // The incoming JSON
+        final JsonObject topologyTemplateJsonObject = toplogyTemplateElement.getAsJsonObject();
+
+        // The outgoing object
+        final PfReferenceKey topologyTemplateKey = new PfReferenceKey(new PfConceptKey(), "IncomingTopologyTemplate");
+        final ToscaTopologyTemplate topologyTemplate = new ToscaTopologyTemplate(topologyTemplateKey);
+
+        if (topologyTemplateJsonObject.has("policies")) {
+            topologyTemplate.setPolicies(new ToscaPoliciesJsonAdapter()
+                    .deserialize(topologyTemplateJsonObject.get("policies"), ToscaPolicies.class, context));
+        }
+
+        return topologyTemplate;
+    }
+
+    @Override
+    public JsonElement serialize(@NonNull final ToscaTopologyTemplate topologyTemplate, @NonNull final Type type,
+            @NonNull final JsonSerializationContext context) {
+
+        return null;
+    }
+}