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/*-
* ============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().registerTypeAdapter(PolicyForwarderConfigurationParameterGroup.class,
new PolicyForwarderConfigurationParametersJsonAdapter()).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;
}
}
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