001/*
002 * (C) Copyright 2006-2008 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 *
019 * $Id$
020 */
021
022package org.nuxeo.ecm.webengine.model.io;
023
024import java.io.File;
025import java.io.FileInputStream;
026import java.io.IOException;
027import java.io.OutputStream;
028import java.lang.annotation.Annotation;
029import java.lang.reflect.Type;
030
031import javax.ws.rs.Produces;
032import javax.ws.rs.core.MediaType;
033import javax.ws.rs.core.MultivaluedMap;
034import javax.ws.rs.ext.MessageBodyWriter;
035import javax.ws.rs.ext.Provider;
036
037import org.apache.commons.io.IOUtils;
038import org.apache.commons.logging.Log;
039import org.apache.commons.logging.LogFactory;
040import org.nuxeo.ecm.core.api.NuxeoException;
041import org.nuxeo.ecm.core.io.download.DownloadHelper;
042
043/**
044 * text/plain is needed otherwise resteasy will use its default text plain (@see DefaultTextPlain) writer to write
045 * text/plain objects and the file is not written correctly.
046 *
047 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
048 */
049@Provider
050@Produces({ "*/*", "text/plain" })
051public class FileWriter implements MessageBodyWriter<File> {
052
053    private static final Log log = LogFactory.getLog(FileWriter.class);
054
055    @Override
056    public void writeTo(File t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
057            MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException {
058        try (FileInputStream in = new FileInputStream(t)) {
059            IOUtils.copy(in, entityStream);
060            entityStream.flush();
061        } catch (IOException e) {
062            if (DownloadHelper.isClientAbortError(e)) {
063                DownloadHelper.logClientAbort(e);
064            } else {
065                throw new NuxeoException("Failed to render resource", e);
066            }
067        }
068    }
069
070    @Override
071    public long getSize(File arg0, Class<?> arg1, Type arg2, Annotation[] arg3, MediaType arg4) {
072        long n = arg0.length();
073        return n <= 0 ? -1 : n;
074    }
075
076    @Override
077    public boolean isWriteable(Class<?> arg0, Type type, Annotation[] arg2, MediaType arg3) {
078        return File.class.isAssignableFrom(arg0);
079    }
080
081}