add rest serve and distribution framework

[multicloud/framework.git] / artifactbroker / main / src / main / java / org / onap / policy / distribution / main / parameters / DistributionParameterHandler.java

diff --git a/artifactbroker/main/src/main/java/org/onap/policy/distribution/main/parameters/DistributionParameterHandler.java b/artifactbroker/main/src/main/java/org/onap/policy/distribution/main/parameters/DistributionParameterHandler.java
new file mode 100644 (file)
index 0000000..dc72978
--- /dev/null
+++ b/artifactbroker/main/src/main/java/org/onap/policy/distribution/main/parameters/DistributionParameterHandler.java
@@ -0,0 +1,85 @@
+/*-
+ * ============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=========================================================
+ */
+
+package org.onap.policy.distribution.main.parameters;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+import java.io.FileReader;
+
+import org.onap.policy.common.logging.flexlogger.FlexLogger;
+import org.onap.policy.common.logging.flexlogger.Logger;
+import org.onap.policy.common.parameters.GroupValidationResult;
+import org.onap.policy.distribution.main.PolicyDistributionException;
+import org.onap.policy.distribution.main.startstop.DistributionCommandLineArguments;
+
+/**
+ * This class handles reading, parsing and validating of policy distribution parameters from JSON files.
+ */
+public class DistributionParameterHandler {
+    private static final Logger LOGGER = FlexLogger.getLogger(DistributionParameterHandler.class);
+
+    /**
+     * Read the parameters from the parameter file.
+     *
+     * @param arguments the arguments passed to policy distribution
+     * @return the parameters read from the configuration file
+     * @throws PolicyDistributionException on parameter exceptions
+     */
+    public DistributionParameterGroup getParameters(final DistributionCommandLineArguments arguments)
+            throws PolicyDistributionException {
+        DistributionParameterGroup distributionParameterGroup = null;
+
+        // Read the parameters
+        try {
+            // Read the parameters from JSON using Gson
+            final Gson gson = new GsonBuilder()
+                    .create();
+            distributionParameterGroup = gson.fromJson(new FileReader(arguments.getFullConfigurationFilePath()),
+                    DistributionParameterGroup.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 PolicyDistributionException(errorMessage, e);
+        }
+
+        // The JSON processing returns null if there is an empty file
+        if (distributionParameterGroup == null) {
+            final String errorMessage = "no parameters found in \"" + arguments.getConfigurationFilePath() + "\"";
+            LOGGER.error(errorMessage);
+            throw new PolicyDistributionException(errorMessage);
+        }
+
+        // validate the parameters
+        final GroupValidationResult validationResult = distributionParameterGroup.validate();
+        if (!validationResult.isValid()) {
+            String returnMessage =
+                    "validation error(s) on parameters from \"" + arguments.getConfigurationFilePath() + "\"\n";
+            returnMessage += validationResult.getResult();
+
+            LOGGER.error(returnMessage);
+            throw new PolicyDistributionException(returnMessage);
+        }
+
+        return distributionParameterGroup;
+    }
+}