/*
* Copyright 2013 MovingBlocks
*
* 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.
*/
package org.terasology.utilities.gson;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Lists;
import com.google.common.collect.SetMultimap;
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.Type;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
*/
public class SetMultimapTypeAdapter<V> implements JsonDeserializer<SetMultimap<String, V>>, JsonSerializer<SetMultimap<String, V>> {
private Class<V> valueType;
public SetMultimapTypeAdapter(Class<V> valueType) {
this.valueType = valueType;
}
@Override
public SetMultimap<String, V> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
SetMultimap<String, V> result = HashMultimap.create();
JsonObject obj = json.getAsJsonObject();
for (Map.Entry<String, JsonElement> entry : obj.entrySet()) {
if (entry.getValue().isJsonArray()) {
for (JsonElement item : entry.getValue().getAsJsonArray()) {
result.put(entry.getKey(), context.<V>deserialize(item, valueType));
}
} else {
result.put(entry.getKey(), context.<V>deserialize(entry.getValue(), valueType));
}
}
return result;
}
@Override
public JsonElement serialize(SetMultimap<String, V> src, Type typeOfSrc, JsonSerializationContext context) {
JsonObject result = new JsonObject();
List<String> keys = Lists.newArrayList(src.keys());
Collections.sort(keys);
for (String key : keys) {
Collection<V> values = src.get(key);
if (values.size() > 1) {
JsonArray array = new JsonArray();
for (V value : values) {
array.add(context.serialize(value));
}
result.add(key, array);
} else if (values.size() == 1) {
result.add(key, context.serialize(values.iterator().next()));
} else {
result.add(key, context.serialize(""));
}
}
return result;
}
}