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/*
* Copyright 2013 Google Inc.
*
* 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 com.google.common.jimfs;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SeekableByteChannel;
/** @author Colin Decker */
public class ByteBufferChannel implements SeekableByteChannel {
private final ByteBuffer buffer;
public ByteBufferChannel(byte[] bytes) {
this.buffer = ByteBuffer.wrap(bytes);
}
public ByteBufferChannel(byte[] bytes, int offset, int length) {
this.buffer = ByteBuffer.wrap(bytes, offset, length);
}
public ByteBufferChannel(int capacity) {
this.buffer = ByteBuffer.allocate(capacity);
}
public ByteBufferChannel(ByteBuffer buffer) {
this.buffer = buffer;
}
public ByteBuffer buffer() {
return buffer;
}
@Override
public int read(ByteBuffer dst) throws IOException {
if (buffer.remaining() == 0) {
return -1;
}
int length = Math.min(dst.remaining(), buffer.remaining());
for (int i = 0; i < length; i++) {
dst.put(buffer.get());
}
return length;
}
@Override
public int write(ByteBuffer src) throws IOException {
int length = Math.min(src.remaining(), buffer.remaining());
for (int i = 0; i < length; i++) {
buffer.put(src.get());
}
return length;
}
@Override
public long position() throws IOException {
return buffer.position();
}
@Override
public SeekableByteChannel position(long newPosition) throws IOException {
buffer.position((int) newPosition);
return this;
}
@Override
public long size() throws IOException {
return buffer.limit();
}
@Override
public SeekableByteChannel truncate(long size) throws IOException {
buffer.limit((int) size);
return this;
}
@Override
public boolean isOpen() {
return true;
}
@Override
public void close() throws IOException {}
}
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