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;
+    }
+}