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    • com.sangupta.jerry.jaxrs.GsonJsonJaxRSMessageBodyHandler Maven / Gradle / Ivy

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    /**
 *
 * jerry - Common Java Functionality
 * Copyright (c) 2012-2017, Sandeep Gupta
 *
 * http://sangupta.com/projects/jerry-core
 *
 * 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.sangupta.jerry.jaxrs;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.Charset;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.sangupta.jerry.util.GsonUtils;

/**
 * A {@link Gson} based implementation for incoming Jax-RS compliant message
 * bodies.
 *
 * @author sangupta
 * @since 2.1
 */
@Provider
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class GsonJsonJaxRSMessageBodyHandler implements MessageBodyWriter, MessageBodyReader {

	private static final String DEFAULT_ENCODING = "UTF-8";

	public static Gson GSON = GsonUtils.getGson(FieldNamingPolicy.IDENTITY);

	@Override
	public boolean isReadable(Class type, Type genericType, java.lang.annotation.Annotation[] annotations, MediaType mediaType) {
		return true;
	}

	@Override
	public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
		return true;
	}

	@Override
	public long getSize(Object object, Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
		return -1;
	}

	/**
	 * @see javax.ws.rs.ext.MessageBodyReader#readFrom(java.lang.Class, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap, java.io.InputStream)
	 */
	@Override
	public Object readFrom(Class type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap httpHeaders, InputStream entityStream) throws IOException, WebApplicationException {
		String encoding = getCharsetAsString(mediaType);
        return GSON.fromJson(new InputStreamReader(entityStream, encoding), genericType);
	}

	/**
	 * @see javax.ws.rs.ext.MessageBodyWriter#writeTo(java.lang.Object, java.lang.Class, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap, java.io.OutputStream)
	 */
	@Override
	public void writeTo(Object object, Class type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {
		String encoding = getCharsetAsString(mediaType);
        String json = GSON.toJson(object, genericType);
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(entityStream, encoding);
        outputStreamWriter.write(json);
        outputStreamWriter.flush();
	}

    /**
	 * Returns the charset as a string depending on the encoding specified, or
	 * the usual default of UTF-8.
	 *
	 * @param m
	 *            the {@link MediaType} provided
	 *
	 * @return the {@link Charset} value as string
	 */
    protected static String getCharsetAsString(MediaType m) {
        if (m == null) {
            return DEFAULT_ENCODING;
        }
        String result = m.getParameters().get("charset");
        return (result == null) ? DEFAULT_ENCODING : result;
    }

}
    
    
    
    

    




    
    
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