1 files changed, 100 insertions, 0 deletions
diff --git a/services/services-engine/src/main/java/org/onap/policy/apex/service/parameters/ApexParameterHandler.java b/services/services-engine/src/main/java/org/onap/policy/apex/service/parameters/ApexParameterHandler.java
new file mode 100644
index 000000000..79f10bdea
--- /dev/null
+++ b/services/services-engine/src/main/java/org/onap/policy/apex/service/parameters/ApexParameterHandler.java
@@ -0,0 +1,100 @@
+/*-
+ * ============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.service.parameters;
+
+import java.io.FileReader;
+
+import org.onap.policy.apex.core.engine.EngineParameters;
+import org.onap.policy.apex.service.engine.main.ApexCommandLineArguments;
+import org.onap.policy.apex.service.parameters.carriertechnology.CarrierTechnologyParameters;
+import org.onap.policy.apex.service.parameters.carriertechnology.CarrierTechnologyParametersJSONAdapter;
+import org.onap.policy.apex.service.parameters.engineservice.EngineServiceParametersJSONAdapter;
+import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolParameters;
+import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolParametersJSONAdapter;
+import org.slf4j.ext.XLogger;
+import org.slf4j.ext.XLoggerFactory;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+/**
+ * This class handles reading, parsing and validating of Apex parameters from JSON files.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class ApexParameterHandler {
+    private static final XLogger LOGGER = XLoggerFactory.getXLogger(ApexParameterHandler.class);
+
+    /**
+     * Read the parameters from the parameter file.
+     *
+     * @param arguments the arguments passed to Apex
+     * @return the parameters read from the configuration file
+     * @throws ApexParameterException on parameter exceptions
+     */
+    public ApexParameters getParameters(final ApexCommandLineArguments arguments) throws ApexParameterException {
+        ApexParameters parameters = null;
+
+        // Read the parameters
+        try {
+            // Register the adapters for our carrier technologies and event protocols with GSON
+            // @formatter:off
+            final Gson gson = new GsonBuilder()
+                    .registerTypeAdapter(EngineParameters           .class, new EngineServiceParametersJSONAdapter())
+                    .registerTypeAdapter(CarrierTechnologyParameters.class, new CarrierTechnologyParametersJSONAdapter())
+                    .registerTypeAdapter(EventProtocolParameters    .class, new EventProtocolParametersJSONAdapter())
+                    .create();
+            // @formatter:on
+            parameters = gson.fromJson(new FileReader(arguments.getFullConfigurationFilePath()), ApexParameters.class);
+        } catch (final Exception e) {
+            final String errorMessage = "error reading parameters from \"" + arguments.getConfigurationFilePath()
+                    + "\"\n" + "(" + e.getClass().getSimpleName() + "):" + e.getMessage();
+            LOGGER.error(errorMessage, e);
+            throw new ApexParameterException(errorMessage, e);
+        }
+
+        // The JSON processing returns null if there is an empty file
+        if (parameters == null) {
+            final String errorMessage = "no parameters found in \"" + arguments.getConfigurationFilePath() + "\"";
+            LOGGER.error(errorMessage);
+            throw new ApexParameterException(errorMessage);
+        }
+
+        // Check if we should override the model file parameter
+        final String modelFilePath = arguments.getModelFilePath();
+        if (modelFilePath != null && modelFilePath.replaceAll("\\s+", "").length() > 0) {
+            parameters.getEngineServiceParameters().setPolicyModelFileName(modelFilePath);
+        }
+
+        // validate the parameters
+        final String validationResult = parameters.validate();
+        if (!validationResult.isEmpty()) {
+            String returnMessage =
+                    "validation error(s) on parameters from \"" + arguments.getConfigurationFilePath() + "\"\n";
+            returnMessage += validationResult;
+
+            LOGGER.error(returnMessage);
+            throw new ApexParameterException(returnMessage);
+        }
+
+        return parameters;
+    }
+}