FileProvider.java

/**
 * Copyright 2005-2014 Restlet
 * 
 * The contents of this file are subject to the terms of one of the following
 * open source licenses: Apache 2.0 or or EPL 1.0 (the "Licenses"). You can
 * select the license that you prefer but you may not use this file except in
 * compliance with one of these Licenses.
 * 
 * You can obtain a copy of the Apache 2.0 license at
 * http://www.opensource.org/licenses/apache-2.0
 * 
 * You can obtain a copy of the EPL 1.0 license at
 * http://www.opensource.org/licenses/eclipse-1.0
 * 
 * See the Licenses for the specific language governing permissions and
 * limitations under the Licenses.
 * 
 * Alternatively, you can obtain a royalty free commercial license with less
 * limitations, transferable or non-transferable, directly at
 * http://restlet.com/products/restlet-framework
 * 
 * Restlet is a registered trademark of Restlet S.A.S.
 */

package org.restlet.ext.jaxrs.internal.provider;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

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 org.restlet.engine.io.IoUtils;

/**
 * This Provider reads or writes {@link File}s.
 * 
 * @author Stephan Koops
 */
@Provider
public class FileProvider extends AbstractProvider<File> {

    /**
     * @see javax.ws.rs.ext.MessageBodyWriter#getSize(java.lang.Object)
     */
    @Override
    public long getSize(File t, Class<?> type, Type genericType,
            Annotation[] annotations, MediaType mediaType) {
        return -1;
    }

    /**
     * @see MessageBodyReader#readFrom(Class, Type, MediaType, Annotation[],
     *      MultivaluedMap, InputStream)
     */
    @Override
    public File readFrom(Class<File> type, Type genericType,
            Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, String> httpHeaders, InputStream entityStream)
            throws IOException {
        final File file = File.createTempFile("FileProvider", ".tmp");
        IoUtils.copy(entityStream, new FileOutputStream(file));
        return file;
    }

    /**
     * @see AbstractProvider#supportedClass()
     */
    @Override
    protected Class<?> supportedClass() {
        return File.class;
    }

    /**
     * @see MessageBodyWriter#writeTo(Object, Class, Type, Annotation[],
     *      MediaType, MultivaluedMap, OutputStream)
     */
    @Override
    public void writeTo(File file, Class<?> type, Type genericType,
            Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, Object> httpHeaders,
            OutputStream entityStream) throws IOException {
        final InputStream inputStream = new FileInputStream(file);
        IoUtils.copy(inputStream, entityStream);
    }
}