org.stjs.server.json.gson.JSMapAdapter.java Source code

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Here is the source code for org.stjs.server.json.gson.JSMapAdapter.java

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/**
 *  Copyright 2011 Alexandru Craciun, Eyal Kaspi
 *
 *  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.stjs.server.json.gson;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import org.stjs.javascript.JSCollections;
import org.stjs.javascript.Map;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

public class JSMapAdapter implements JsonSerializer<Map<?, ?>>, JsonDeserializer<Map<?, ?>> {

    @Override
    public Map<?, ?> deserialize(JsonElement elem, Type type, JsonDeserializationContext ctx)
            throws JsonParseException {
        if (elem == null) {
            return null;
        }
        JsonObject js = elem.getAsJsonObject();
        Type valueType = (type instanceof ParameterizedType)
                ? ((ParameterizedType) type).getActualTypeArguments()[1]
                : Object.class;
        Map<String, Object> map = JSCollections.$map();
        for (java.util.Map.Entry<String, JsonElement> entry : js.entrySet()) {
            map.$put(entry.getKey(), ctx.deserialize(entry.getValue(), valueType));
        }

        return map;
    }

    @SuppressWarnings("unchecked")
    @Override
    public JsonElement serialize(Map<?, ?> map, Type typeOfSrc, JsonSerializationContext ctx) {
        if (map == null) {
            return new JsonNull();
        }
        JsonObject js = new JsonObject();
        for (Object k : map) {
            js.add(k.toString(), ctx.serialize(((Map) map).$get(k.toString())));
        }
        return js;
    }

}