jp.classmethod.aws.brian.utils.GsonFactoryBean.java Source code

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Here is the source code for jp.classmethod.aws.brian.utils.GsonFactoryBean.java

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/*
 * Copyright 2013-2014 Classmethod, Inc.
 *
 * 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 jp.classmethod.aws.brian.utils;

import java.lang.reflect.Type;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

import org.springframework.beans.factory.FactoryBean;

/**
 * {@link FactoryBean} for {@link Gson}.
 * 
 * @since 1.0
 * @author daisuke
 */
public class GsonFactoryBean implements FactoryBean<Gson> {

    @Override
    public Gson getObject() {
        GsonBuilder builder = new GsonBuilder();
        builder.registerTypeAdapter(Class.class, new ClassSerializer());
        builder.registerTypeAdapter(TimeZone.class, new TimeZoneSerializer());
        builder.registerTypeAdapter(Date.class, new DateSerializer());
        Gson gson = builder.create();
        return gson;
    }

    @Override
    public Class<?> getObjectType() {
        return Gson.class;
    }

    @Override
    public boolean isSingleton() {
        return true;
    }
}

class ClassSerializer implements JsonSerializer<Class<?>> {

    @Override
    public JsonElement serialize(Class<?> src, Type typeOfSrc, JsonSerializationContext context) {
        return new JsonPrimitive(src.getName());
    }
}

class TimeZoneSerializer implements JsonSerializer<TimeZone> {

    @Override
    public JsonElement serialize(TimeZone src, Type typeOfSrc, JsonSerializationContext context) {
        return new JsonPrimitive(src.getID());
    }
}

class DateSerializer implements JsonSerializer<Date> {

    @Override
    public JsonElement serialize(Date src, Type typeOfSrc, JsonSerializationContext context) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
        sdf.setTimeZone(TimeZone.getTimeZone("Universal"));
        return new JsonPrimitive(sdf.format(src));
    }
}