/*
* JBoss, Home of Professional Open Source
* Copyright 2012, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed 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.
*/
package org.jboss.shrinkwrap.api.nio.file;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.SeekableByteChannel;
import org.jboss.shrinkwrap.api.Archive;
import org.jboss.shrinkwrap.api.asset.Asset;
/**
* An {@link Asset} implementation backed by an internal memory representation; able to be directly added to an
* {@link Archive}, and supports all operations designated by the NIO.2 {@link SeekableByteChannel} API. Thread-safe.
*
* @author <a href="mailto:alr@jboss.org">Andrew Lee Rubinger</a>
*/
public class MemoryAsset implements Asset, SeekableByteChannel {
private final SeekableInMemoryByteChannel delegate;
/**
* Creates a new instance with internal memory buffer initially sized at 0 and at position 0, capable of holding a
* maximum of {@link Integer#MAX_VALUE} bytes.
*/
public MemoryAsset() {
this(new SeekableInMemoryByteChannel());
}
/**
* Creates a new instance with internal memory buffer delegate using the specified (required)
* {@link SeekableInMemoryByteChannel}
*
* @param delegate
*/
MemoryAsset(final SeekableInMemoryByteChannel delegate) throws IllegalArgumentException {
assert delegate != null : "Delegate must be specified";
this.delegate = delegate;
}
/**
* @return
* @see java.nio.channels.Channel#isOpen()
*/
@Override
public boolean isOpen() {
return delegate.isOpen();
}
/**
* @throws IOException
* @see java.nio.channels.Channel#close()
*/
@Override
public void close() throws IOException {
delegate.close();
}
/**
* @param dst
* @return
* @throws IOException
* @see java.nio.channels.SeekableByteChannel#read(java.nio.ByteBuffer)
*/
@Override
public int read(final ByteBuffer dst) throws IOException {
return delegate.read(dst);
}
/**
* @param src
* @return
* @throws IOException
* @see java.nio.channels.SeekableByteChannel#write(java.nio.ByteBuffer)
*/
@Override
public int write(final ByteBuffer src) throws IOException {
return delegate.write(src);
}
/**
* @return
* @throws IOException
* @see java.nio.channels.SeekableByteChannel#position()
*/
@Override
public long position() throws IOException {
return delegate.position();
}
/**
* {@inheritDoc}
*
* @param newPosition
* @return
* @throws IOException
* @see java.nio.channels.SeekableByteChannel#position(long)
*/
@Override
public SeekableByteChannel position(final long newPosition) throws IOException {
delegate.position(newPosition);
return this;
}
/**
* {@inheritDoc}
*
* @return
* @throws IOException
* @see java.nio.channels.SeekableByteChannel#size()
*/
@Override
public long size() throws IOException {
return delegate.size();
}
/**
* {@inheritDoc}
*
* @param size
* @return
* @throws IOException
* @see java.nio.channels.SeekableByteChannel#truncate(long)
*/
@Override
public SeekableByteChannel truncate(final long size) throws IOException {
this.delegate.truncate(size);
return this;
}
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.api.asset.Asset#openStream()
*/
@Override
public InputStream openStream() {
return delegate.getContents();
}
}