org.etk.core.rest.impl.provider.MultipartFormDataEntityProvider.java Source code

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Here is the source code for org.etk.core.rest.impl.provider.MultipartFormDataEntityProvider.java

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/**
 * Copyright (C) 2003-2008 eXo Platform SAS.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see<http://www.gnu.org/licenses/>.
 */

package org.etk.core.rest.impl.provider;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Iterator;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.Provider;

import org.apache.commons.fileupload.DefaultFileItemFactory;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.FileUploadException;

import org.etk.core.rest.RequestHandler;
import org.etk.core.rest.impl.ApplicationContext;
import org.etk.core.rest.impl.ApplicationContextImpl;
import org.etk.core.rest.provider.EntityProvider;

@Provider
@Consumes({ "multipart/*" })
public class MultipartFormDataEntityProvider implements EntityProvider<Iterator<FileItem>> {

    /**
     * @see HttpServletRequest
     */
    @Context
    private HttpServletRequest httpRequest;

    /**
     * {@inheritDoc}
     */
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        if (type == Iterator.class) {
            try {
                ParameterizedType t = (ParameterizedType) genericType;
                Type[] ta = t.getActualTypeArguments();
                if (ta.length == 1 && ta[0] == FileItem.class) {
                    return true;
                }
                return false;
            } catch (ClassCastException e) {
                return false;
            }
        }

        return false;
    }

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    public Iterator<FileItem> readFrom(Class<Iterator<FileItem>> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream)
            throws IOException {
        try {
            ApplicationContext context = ApplicationContextImpl.getCurrent();
            int bufferSize = (Integer) context.getAttributes().get(RequestHandler.WS_RS_BUFFER_SIZE);
            File repo = (File) context.getAttributes().get(RequestHandler.WS_RS_TMP_DIR);

            DefaultFileItemFactory factory = new DefaultFileItemFactory(bufferSize, repo);
            FileUpload upload = new FileUpload(factory);
            return upload.parseRequest(httpRequest).iterator();
        } catch (FileUploadException e) {
            throw new IOException("Can't process multipart data item " + e);
        }
    }

    /**
     * {@inheritDoc}
     */
    public long getSize(Iterator<FileItem> t, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType) {
        return -1;
    }

    /**
     * {@inheritDoc}
     */
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        // output is not supported
        return false;
    }

    /**
     * {@inheritDoc}
     */
    public void writeTo(Iterator<FileItem> t, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
            throws IOException {
        throw new UnsupportedOperationException();
    }

}