1 files changed, 118 insertions, 0 deletions
diff --git a/model/src/main/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelCustomGsonMapAdapter.java b/model/src/main/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelCustomGsonMapAdapter.java
new file mode 100644
index 000000000..cb67590f7
--- /dev/null
+++ b/model/src/main/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelCustomGsonMapAdapter.java
@@ -0,0 +1,118 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 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.policy.apex.model.basicmodel.handling;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.util.AbstractMap;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.TreeMap;
+import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
+
+@SuppressWarnings("rawtypes")
+public class ApexModelCustomGsonMapAdapter implements JsonSerializer<Map>, JsonDeserializer<Map> {
+    private static final String MAP_ENTRY_KEY = "entry";
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public Map deserialize(JsonElement jsonElement, Type typeOfT, JsonDeserializationContext context)
+        throws JsonParseException {
+
+        if (!(jsonElement instanceof JsonObject)) {
+            throw new JsonParseException("could not parse JSON map, map is not a JsonObject");
+        }
+
+        JsonObject jsonObject = (JsonObject) jsonElement;
+
+        if (jsonObject.size() != 1) {
+            throw new JsonParseException("could not parse JSON map, map must be in a JsonObject with a single member");
+        }
+
+        JsonArray mapEntryArray = (JsonArray) jsonObject.get(MAP_ENTRY_KEY);
+        if (mapEntryArray == null) {
+            throw new JsonParseException("could not parse JSON map, map \"entry\" in JsonObject not found");
+        }
+
+        return new TreeMap(
+            StreamSupport
+                .stream(mapEntryArray.spliterator(), true)
+                .map(element -> deserializeMapEntry(element, typeOfT, context))
+                .collect(Collectors.toMap(entry -> entry.getKey(), entry -> entry.getValue()))
+        );
+    }
+
+    @Override
+    public JsonElement serialize(Map sourceMap, Type typeOfSrc, JsonSerializationContext context) {
+
+        // A map is stored in a JsonArray
+        JsonArray mapEntryArray = new JsonArray();
+
+        for (Object mapEntryObject : sourceMap.entrySet()) {
+            Entry mapEntry = (Entry) mapEntryObject;
+            mapEntryArray.add(serializeMapEntry(mapEntry, typeOfSrc, context));
+        }
+
+        JsonObject returnObject = new JsonObject();
+        returnObject.add(MAP_ENTRY_KEY, mapEntryArray);
+
+        return returnObject;
+    }
+
+    @SuppressWarnings("unchecked")
+    private static Entry deserializeMapEntry(JsonElement element, Type typeOfT, JsonDeserializationContext context) {
+        // Get the types of the map
+        ParameterizedType pt = (ParameterizedType) typeOfT;
+
+        // Type of the key and value of the map
+        Type keyType = pt.getActualTypeArguments()[0];
+        Type valueType = pt.getActualTypeArguments()[1];
+
+        // Deserialize the key and value
+        return new AbstractMap.SimpleEntry(
+            context.deserialize(element.getAsJsonObject().get("key"), keyType),
+            context.deserialize(element.getAsJsonObject().get("value"), valueType));
+    }
+
+    private static JsonElement serializeMapEntry(Entry sourceEntry, Type typeOfSrc, JsonSerializationContext context) {
+        // Get the types of the map
+        ParameterizedType pt = (ParameterizedType) typeOfSrc;
+
+        // Type of the key and value of the map
+        Type keyType = pt.getActualTypeArguments()[0];
+        Type valueType = pt.getActualTypeArguments()[1];
+
+        JsonObject entryObject = new JsonObject();
+        entryObject.add("key", context.serialize(sourceEntry.getKey(), keyType));
+        entryObject.add("value", context.serialize(sourceEntry.getValue(), valueType));
+
+        return entryObject;
+    }
+}