Migrate Spike code to ONAP

[aai/spike.git] / src / main / java / org / onap / aai / spike / event / envelope / EventEnvelopeParser.java

diff --git a/src/main/java/org/onap/aai/spike/event/envelope/EventEnvelopeParser.java b/src/main/java/org/onap/aai/spike/event/envelope/EventEnvelopeParser.java
new file mode 100644 (file)
index 0000000..8b62ffa
--- /dev/null
+++ b/src/main/java/org/onap/aai/spike/event/envelope/EventEnvelopeParser.java
@@ -0,0 +1,64 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2017-2018 Amdocs
+ * ================================================================================
+ * 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.aai.spike.event.envelope;
+
+import java.util.UUID;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParser;
+import org.onap.aai.spike.event.incoming.GizmoGraphEvent;
+import org.onap.aai.spike.exception.SpikeException;
+import org.onap.aai.spike.schema.GraphEventTransformer;
+
+public class EventEnvelopeParser {
+
+    /**
+     * Parses the event to extract the content of the body and generate a {@link GizmoGraphEvent}
+     * object.
+     *
+     * @param event event envelope with both header and body properties
+     * @return the body of the event represented by a {@link GizmoGraphEvent} object
+     * @throws SpikeException if the event cannot be parsed
+     */
+    public GizmoGraphEvent parseEvent(String event) throws SpikeException {
+
+        GizmoGraphEvent graphEvent = GizmoGraphEvent.fromJson(extractEventBody(event));
+
+        GraphEventTransformer.populateUUID(graphEvent);
+        if (graphEvent.getTransactionId() == null || graphEvent.getTransactionId().isEmpty()) {
+            graphEvent.setTransactionId(UUID.randomUUID().toString());
+        }
+        if (graphEvent.getRelationship() != null) {
+            GraphEventTransformer.validateEdgeModel(graphEvent.getRelationship());
+        } else if (graphEvent.getVertex() != null) {
+            GraphEventTransformer.validateVertexModel(graphEvent.getVertex());
+        } else {
+            throw new SpikeException("Unable to parse event: " + event);
+        }
+
+        return graphEvent;
+    }
+
+    private String extractEventBody(String event) {
+        JsonParser jsonParser = new JsonParser();
+        JsonElement jsonElement = jsonParser.parse(event);
+        return jsonElement.getAsJsonObject().get("body").toString();
+    }
+}