diff options
Diffstat (limited to 'dcae-analytics/dcae-analytics-tca-core/src/main/java/org/onap/dcae/analytics/tca/core/util/function/calculation/TcaEventListenerExtractor.java')
-rw-r--r-- | dcae-analytics/dcae-analytics-tca-core/src/main/java/org/onap/dcae/analytics/tca/core/util/function/calculation/TcaEventListenerExtractor.java | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/dcae-analytics/dcae-analytics-tca-core/src/main/java/org/onap/dcae/analytics/tca/core/util/function/calculation/TcaEventListenerExtractor.java b/dcae-analytics/dcae-analytics-tca-core/src/main/java/org/onap/dcae/analytics/tca/core/util/function/calculation/TcaEventListenerExtractor.java new file mode 100644 index 0000000..b194da8 --- /dev/null +++ b/dcae-analytics/dcae-analytics-tca-core/src/main/java/org/onap/dcae/analytics/tca/core/util/function/calculation/TcaEventListenerExtractor.java @@ -0,0 +1,76 @@ +/* + * ================================================================================ + * 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; + } +} |