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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
* Modifications Copyright (C) 2019-2021 AT&T Intellectual Property. 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.models.sim.dmaap.parameters;
import java.io.File;
import org.onap.policy.common.parameters.ValidationResult;
import org.onap.policy.common.utils.coder.Coder;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.common.utils.coder.StandardCoder;
import org.onap.policy.models.sim.dmaap.DmaapSimException;
import org.onap.policy.models.sim.dmaap.startstop.DmaapSimCommandLineArguments;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class handles reading, parsing and validating of DMaaP simulator parameters from JSON files.
*/
public class DmaapSimParameterHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(DmaapSimParameterHandler.class);
private final Coder coder = new StandardCoder();
/**
* Read the parameters from the parameter file.
*
* @param arguments the arguments passed to DMaaP simulator
* @return the parameters read from the configuration file
* @throws DmaapSimException on parameter exceptions
*/
public DmaapSimParameterGroup getParameters(final DmaapSimCommandLineArguments arguments) throws DmaapSimException {
DmaapSimParameterGroup dmaapSimParameterGroup = null;
// Read the parameters
try {
// Read the parameters from JSON
var file = new File(arguments.getFullConfigurationFilePath());
dmaapSimParameterGroup = coder.decode(file, DmaapSimParameterGroup.class);
} catch (final CoderException e) {
final String errorMessage = "error reading parameters from \"" + arguments.getConfigurationFilePath()
+ "\"\n" + "(" + e.getClass().getSimpleName() + "):" + e.getMessage();
LOGGER.error(errorMessage);
throw new DmaapSimException(errorMessage, e);
}
// The JSON processing returns null if there is an empty file
if (dmaapSimParameterGroup == null) {
final String errorMessage = "no parameters found in \"" + arguments.getConfigurationFilePath() + "\"";
LOGGER.error(errorMessage);
throw new DmaapSimException(errorMessage);
}
// validate the parameters
final ValidationResult validationResult = dmaapSimParameterGroup.validate();
if (!validationResult.isValid()) {
String returnMessage =
"validation error(s) on parameters from \"" + arguments.getConfigurationFilePath() + "\"\n";
returnMessage += validationResult.getResult();
LOGGER.error(returnMessage);
throw new DmaapSimException(returnMessage);
}
return dmaapSimParameterGroup;
}
}
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