| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 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.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 extends AbstractTypedContentProvider |
| { |
| 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 |
| { |
| this("application/octet-stream", filePath, bufferSize); |
| } |
| |
| public PathContentProvider(String contentType, Path filePath) throws IOException |
| { |
| this(contentType, filePath, 4096); |
| } |
| |
| public PathContentProvider(String contentType, Path filePath, int bufferSize) throws IOException |
| { |
| super(contentType); |
| 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); |
| if (LOG.isDebugEnabled()) |
| 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); |
| } |
| } |
| } |
| } |