com.strategicgains.restexpress.serialization.json.DefaultJsonProcessor.java Source code

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Here is the source code for com.strategicgains.restexpress.serialization.json.DefaultJsonProcessor.java

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/*
 * Copyright 2010, Strategic Gains, 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 com.strategicgains.restexpress.serialization.json;

import java.io.InputStreamReader;
import java.util.Date;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBufferInputStream;

import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.strategicgains.restexpress.ContentType;
import com.strategicgains.restexpress.serialization.SerializationProcessor;
import com.strategicgains.util.date.DateAdapterConstants;

/**
 * A SerializationProcessor to handle JSON input/output.  It anticipates ISO 8601-compatible time points for date instances
 * and outputs dates as ISO 8601 time points.
 * 
 * @author toddf
 * @since Mar 16, 2010
 */
public class DefaultJsonProcessor implements SerializationProcessor {
    private Gson gson;

    public DefaultJsonProcessor() {
        super();
        gson = new GsonBuilder().disableHtmlEscaping()
                .registerTypeAdapter(Date.class, new GsonTimestampSerializer())
                .setDateFormat(DateAdapterConstants.TIMESTAMP_OUTPUT_FORMAT)
                .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create();
    }

    public DefaultJsonProcessor(Gson gson) {
        super();
        this.gson = gson;
    }

    // SECTION: SERIALIZATION PROCESSOR

    @Override
    public <T> T deserialize(String string, Class<T> type) {
        return gson.fromJson((String) string, type);
    }

    @Override
    public <T> T deserialize(ChannelBuffer buffer, Class<T> type) {
        return gson.fromJson(new InputStreamReader(new ChannelBufferInputStream(buffer)), type);
    }

    @Override
    public String serialize(Object object) {
        return gson.toJson(object);
    }

    @Override
    public String getResultingContentType() {
        return ContentType.JSON;
    }
}