//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.client.util;
import java.io.Closeable;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.AccessDeniedException;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.eclipse.jetty.client.api.ContentProvider;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/**
* A {@link ContentProvider} for files using JDK 7's {@code java.nio.file} APIs.
* <p />
* It is possible to specify, at the constructor, a buffer size used to read content from the
* stream, by default 4096 bytes.
*/
public class PathContentProvider implements ContentProvider
{
private static final Logger LOG = Log.getLogger(PathContentProvider.class);
private final Path filePath;
private final long fileSize;
private final int bufferSize;
public PathContentProvider(Path filePath) throws IOException
{
this(filePath, 4096);
}
public PathContentProvider(Path filePath, int bufferSize) throws IOException
{
if (!Files.isRegularFile(filePath))
throw new NoSuchFileException(filePath.toString());
if (!Files.isReadable(filePath))
throw new AccessDeniedException(filePath.toString());
this.filePath = filePath;
this.fileSize = Files.size(filePath);
this.bufferSize = bufferSize;
}
@Override
public long getLength()
{
return fileSize;
}
@Override
public Iterator<ByteBuffer> iterator()
{
return new PathIterator();
}
private class PathIterator implements Iterator<ByteBuffer>, Closeable
{
private final ByteBuffer buffer = ByteBuffer.allocateDirect(bufferSize);
private SeekableByteChannel channel;
private long position;
@Override
public boolean hasNext()
{
return position < getLength();
}
@Override
public ByteBuffer next()
{
try
{
if (channel == null)
{
channel = Files.newByteChannel(filePath, StandardOpenOption.READ);
LOG.debug("Opened file {}", filePath);
}
buffer.clear();
int read = channel.read(buffer);
if (read < 0)
throw new NoSuchElementException();
if (LOG.isDebugEnabled())
LOG.debug("Read {} bytes from {}", read, filePath);
position += read;
if (!hasNext())
close();
buffer.flip();
return buffer;
}
catch (NoSuchElementException x)
{
close();
throw x;
}
catch (Exception x)
{
close();
throw (NoSuchElementException)new NoSuchElementException().initCause(x);
}
}
@Override
public void remove()
{
throw new UnsupportedOperationException();
}
@Override
public void close()
{
try
{
if (channel != null)
channel.close();
}
catch (Exception x)
{
LOG.ignore(x);
}
}
}
}