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/*-
* ============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;
}
}
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