/*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.nio.entity;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import org.apache.http.annotation.NotThreadSafe;
import org.apache.http.entity.AbstractHttpEntity;
import org.apache.http.entity.ContentType;
import org.apache.http.nio.ContentEncoder;
import org.apache.http.nio.ContentEncoderChannel;
import org.apache.http.nio.FileContentEncoder;
import org.apache.http.nio.IOControl;
import org.apache.http.util.Args;
/**
* A self contained, repeatable non-blocking entity that retrieves its content
* from a file. This class is mostly used to stream large files of different
* types, so one needs to supply the content type of the file to make sure
* the content can be correctly recognized and processed by the recipient.
*
* @since 4.0
*/
@SuppressWarnings("deprecation")
@NotThreadSafe
public class NFileEntity extends AbstractHttpEntity
implements HttpAsyncContentProducer, ProducingNHttpEntity {
private final File file;
private RandomAccessFile accessfile;
private FileChannel fileChannel;
private long idx = -1;
private boolean useFileChannels;
/**
* Creates new instance of NFileEntity from the given source {@link File}
* with the given content type. If {@code useFileChannels} is set to
* {@code true}, the entity will try to use {@link FileContentEncoder}
* interface to stream file content directly from the file channel.
*
* @param file the source file.
* @param contentType the content type of the file.
* @param useFileChannels flag whether the direct transfer from the file
* channel should be attempted.
*
* @since 4.2
*/
public NFileEntity(final File file, final ContentType contentType, final boolean useFileChannels) {
Args.notNull(file, "File");
this.file = file;
this.useFileChannels = useFileChannels;
if (contentType != null) {
setContentType(contentType.toString());
}
}
/**
* @since 4.2
*/
public NFileEntity(final File file) {
Args.notNull(file, "File");
this.file = file;
}
/**
* Creates new instance of NFileEntity from the given source {@link File}
* with the given content type.
*
* @param file the source file.
* @param contentType the content type of the file.
*
* @since 4.2
*/
public NFileEntity(final File file, final ContentType contentType) {
this(file, contentType, true);
}
/**
* @deprecated (4.2) use {@link #NFileEntity(File, ContentType, boolean)}
*/
@Deprecated
public NFileEntity(final File file, final String contentType, final boolean useFileChannels) {
Args.notNull(file, "File");
this.file = file;
this.useFileChannels = useFileChannels;
setContentType(contentType);
}
/**
* @deprecated (4.2) use {@link #NFileEntity(File, ContentType)}
*/
@Deprecated
public NFileEntity(final File file, final String contentType) {
this(file, contentType, true);
}
/**
* {@inheritDoc}
*
* @since 4.2
*/
@Override
public void close() throws IOException {
if (accessfile != null) {
accessfile.close();
}
accessfile = null;
fileChannel = null;
}
/**
* {@inheritDoc}
*
* @deprecated (4.2) use {@link #close()}
*/
@Deprecated
public void finish() throws IOException {
close();
}
@Override
public long getContentLength() {
return file.length();
}
@Override
public boolean isRepeatable() {
return true;
}
@Override
public void produceContent(final ContentEncoder encoder, final IOControl ioctrl)
throws IOException {
if (accessfile == null) {
accessfile = new RandomAccessFile(this.file, "r");
}
if (fileChannel == null) {
fileChannel = accessfile.getChannel();
idx = 0;
}
final long transferred;
if (useFileChannels && encoder instanceof FileContentEncoder) {
transferred = ((FileContentEncoder)encoder)
.transfer(fileChannel, idx, Long.MAX_VALUE);
} else {
transferred = fileChannel.
transferTo(idx, Long.MAX_VALUE, new ContentEncoderChannel(encoder));
}
if (transferred > 0) {
idx += transferred;
}
if (idx >= fileChannel.size()) {
encoder.complete();
close();
}
}
@Override
public boolean isStreaming() {
return false;
}
@Override
public InputStream getContent() throws IOException {
return new FileInputStream(this.file);
}
@Override
public void writeTo(final OutputStream outstream) throws IOException {
Args.notNull(outstream, "Output stream");
final InputStream instream = new FileInputStream(this.file);
try {
final byte[] tmp = new byte[4096];
int l;
while ((l = instream.read(tmp)) != -1) {
outstream.write(tmp, 0, l);
}
outstream.flush();
} finally {
instream.close();
}
}
}