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/*
 * 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.asset;

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.nio2.file.SeekableInMemoryByteChannel;

/**
 * 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 Andrew Lee Rubinger
 */
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
     *            The {@link SeekableInMemoryByteChannel} to use as the internal memory buffer
     */
    MemoryAsset(final SeekableInMemoryByteChannel delegate) throws IllegalArgumentException {
        assert delegate != null : "Delegate must be specified";
        this.delegate = delegate;
    }

    /**
     * @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
     *            The buffer into which bytes are to be transferred
     * @return The number of bytes read, or -1 if the end of the stream is reached
     * @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
     *            The buffer from which bytes are to be written
     * @return The number of bytes written
     * @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 The current position in the channel
     * @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
     * @see java.nio.channels.SeekableByteChannel#truncate(long)
     */
    @Override
    public SeekableByteChannel truncate(final long size) {
        this.delegate.truncate(size);
        return this;
    }

    /**
     * {@inheritDoc}
     *
     * @see org.jboss.shrinkwrap.api.asset.Asset#openStream()
     */
    @Override
    public InputStream openStream() {
        return delegate.getContents();
    }

}