| /* |
| * 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 {} |
| } |