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/*
* ================================================================================
* Copyright (c) 2018 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.
* ============LICENSE_END=========================================================
*
*/
package org.onap.dcae.analytics.tca.core.util.function.calculation;
import java.util.Optional;
import org.onap.dcae.analytics.model.cef.EventListener;
import org.onap.dcae.analytics.model.util.json.AnalyticsModelJsonConversion;
import org.onap.dcae.analytics.tca.core.service.TcaExecutionContext;
/**
* Tca Event Listener Calculation Function converts incoming CEF string message
* to Java Object of type Event Listener
*
* @author Rajiv Singla
*/
public class TcaEventListenerExtractor implements TcaCalculationFunction {
@Override
public TcaExecutionContext calculate(final TcaExecutionContext tcaExecutionContext) {
final String cefMessage = tcaExecutionContext.getCefMessage();
// Check blank message
if (cefMessage == null || cefMessage.isEmpty() || cefMessage.trim().isEmpty()) {
final String errorMessage = "Blank CEF message cannot be converted to CEF Event Listener Object";
setTerminatingMessage(errorMessage, tcaExecutionContext, true);
return tcaExecutionContext;
}
// Check CEF message is a valid JSON Object
final String trimmedMessage = cefMessage.trim();
if (!(trimmedMessage.startsWith("{") && trimmedMessage.endsWith("}"))) {
final String errorMessage =
"CEF Message must be a JSON object starting and ending with curly braces. Invalid JSON String: " +
cefMessage;
setTerminatingMessage(errorMessage, tcaExecutionContext, true);
return tcaExecutionContext;
}
// Parse CEF message as JSON Object
final Optional<EventListener> eventListenerOptional =
AnalyticsModelJsonConversion.EVENT_LISTENER_JSON_FUNCTION.apply(cefMessage);
if (!eventListenerOptional.isPresent()) {
final String errorMessage =
"Unable to parse given CEF Message as JSON Object. CEF Message String: " + cefMessage;
setTerminatingMessage(errorMessage, tcaExecutionContext, true);
return tcaExecutionContext;
}
// JSON parsing completed successfully
tcaExecutionContext.getTcaProcessingContext().setEventListener(eventListenerOptional.get());
return tcaExecutionContext;
}
}
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