1 files changed, 81 insertions, 0 deletions
diff --git a/src/main/java/org/onap/dcaegen2/services/pmmapper/utils/DMaaPAdapter.java b/src/main/java/org/onap/dcaegen2/services/pmmapper/utils/DMaaPAdapter.java
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index 0000000..fa01740
--- /dev/null
+++ b/src/main/java/org/onap/dcaegen2/services/pmmapper/utils/DMaaPAdapter.java
@@ -0,0 +1,81 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.dcaegen2.services.pmmapper.utils;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonParseException;
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+import java.util.Optional;
+import org.onap.dcaegen2.services.pmmapper.model.PublisherConfig;
+import org.onap.dcaegen2.services.pmmapper.model.SubscriberConfig;
+
+public class DMaaPAdapter extends TypeAdapter<Object> {
+    private static final String PUBLISHER = "dmaap_publisher";
+    private static final String SUBSCRIBER = "dmaap_subscriber";
+    private static final String DMAAP_INFO = "dmaap_info";
+
+    @Override
+    public void write(JsonWriter jsonWriter, Object dmaapObj) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Object read(JsonReader jsonReader) throws IOException {
+        jsonReader.beginObject();
+        String rootName = jsonReader.nextName();
+        Class configClass = getConfigClass(rootName);
+
+        Object generatedConfig = null;
+        jsonReader.beginObject();
+        while (jsonReader.hasNext()) {
+            if (jsonReader.nextName().equals(DMAAP_INFO)) {
+                generatedConfig  = new Gson().fromJson(jsonReader, configClass);
+            } else {
+                jsonReader.skipValue();
+            }
+        }
+        if (generatedConfig == null) {
+            throw new JsonParseException("Failed to Identify DMaaP Object");
+        }
+
+        jsonReader.endObject();
+        jsonReader.endObject();
+        return generatedConfig;
+    }
+    private Class getConfigClass(String rootName) {
+        Class configClass;
+        switch (rootName) {
+            case PUBLISHER:
+                configClass = PublisherConfig.class;
+                break;
+            case SUBSCRIBER:
+                configClass = SubscriberConfig.class;
+                break;
+            default:
+                String reason = String.format("This adapter expects one of: [ %s, %s]", PUBLISHER, SUBSCRIBER);
+                throw new IllegalArgumentException(reason);
+        }
+        return configClass;
+    }
+}