GsonJaxRsProvider.java

/*
 * Copyright (c) 2014. by Robusta Code and individual contributors
 *  as indicated by the @authors tag. See the copyright.txt in the
 * distribution for a full listing of individual contributors.
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 io.robusta.rra.representation.implementation;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

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;

/**
 * Created by Stephanie Pitou on 15/09/14.
 */
@Provider
@Consumes( "application/json" )
@Produces( "application/json" )
public class GsonJaxRsProvider implements MessageBodyReader<GsonRepresentation>, MessageBodyWriter<GsonRepresentation> {

    /*
     * (non-Javadoc)
     * 
     * @see javax.ws.rs.ext.MessageBodyReader#isReadable(java.lang.Class,
     * java.lang.reflect.Type, java.lang.annotation.Annotation[],
     * javax.ws.rs.core.MediaType)
     */
    @Override
    public boolean isReadable( Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType ) {
        return aClass == GsonRepresentation.class;
    }

    /*
     * (non-Javadoc)
     * 
     * @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 GsonRepresentation readFrom( Class<GsonRepresentation> gsonRepresentationClass, Type type,
            Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> stringStringMultivaluedMap,
            InputStream inputStream ) throws IOException, WebApplicationException {
        return new GsonRepresentation( inputStream );
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.ws.rs.ext.MessageBodyWriter#isWriteable(java.lang.Class,
     * java.lang.reflect.Type, java.lang.annotation.Annotation[],
     * javax.ws.rs.core.MediaType)
     */
    @Override
    public boolean isWriteable( Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType ) {
        return type == GsonRepresentation.class;
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.ws.rs.ext.MessageBodyWriter#getSize(java.lang.Object,
     * java.lang.Class, java.lang.reflect.Type,
     * java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType)
     */
    @Override
    public long getSize( GsonRepresentation representation, Class<?> aClass, Type type, Annotation[] annotations,
            MediaType mediaType ) {
        return -1;
    }

    /*
     * (non-Javadoc)
     * 
     * @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( GsonRepresentation representation, Class<?> aClass, Type type, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, Object> stringObjectMultivaluedMap, OutputStream outputStream )
            throws IOException, WebApplicationException {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream( baos );

        oos.writeObject( representation.toString() );

        oos.flush();
        oos.close();
    }

}