| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.hadoop.io; |
| |
| import java.io.DataOutputStream; |
| import java.io.OutputStream; |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| import java.util.ArrayList; |
| import java.util.LinkedList; |
| |
| public class DataOutputByteBuffer extends DataOutputStream { |
| |
| static class Buffer extends OutputStream { |
| |
| final byte[] b = new byte[1]; |
| final boolean direct; |
| final List<ByteBuffer> active = new ArrayList<ByteBuffer>(); |
| final List<ByteBuffer> inactive = new LinkedList<ByteBuffer>(); |
| int size; |
| int length; |
| ByteBuffer current; |
| |
| Buffer(int size, boolean direct) { |
| this.direct = direct; |
| this.size = size; |
| current = direct |
| ? ByteBuffer.allocateDirect(size) |
| : ByteBuffer.allocate(size); |
| } |
| @Override |
| public void write(int b) { |
| this.b[0] = (byte)(b & 0xFF); |
| write(this.b); |
| } |
| @Override |
| public void write(byte[] b) { |
| write(b, 0, b.length); |
| } |
| @Override |
| public void write(byte[] b, int off, int len) { |
| int rem = current.remaining(); |
| while (len > rem) { |
| current.put(b, off, rem); |
| length += rem; |
| current.flip(); |
| active.add(current); |
| off += rem; |
| len -= rem; |
| rem = getBuffer(len); |
| } |
| current.put(b, off, len); |
| length += len; |
| } |
| int getBuffer(int newsize) { |
| if (inactive.isEmpty()) { |
| size = Math.max(size << 1, newsize); |
| current = direct |
| ? ByteBuffer.allocateDirect(size) |
| : ByteBuffer.allocate(size); |
| } else { |
| current = inactive.remove(0); |
| } |
| return current.remaining(); |
| } |
| ByteBuffer[] getData() { |
| ByteBuffer[] ret = active.toArray(new ByteBuffer[active.size() + 1]); |
| ByteBuffer tmp = current.duplicate(); |
| tmp.flip(); |
| ret[ret.length - 1] = tmp.slice(); |
| return ret; |
| } |
| int getLength() { |
| return length; |
| } |
| void reset() { |
| length = 0; |
| current.rewind(); |
| inactive.add(0, current); |
| for (int i = active.size() - 1; i >= 0; --i) { |
| ByteBuffer b = active.remove(i); |
| b.rewind(); |
| inactive.add(0, b); |
| } |
| current = inactive.remove(0); |
| } |
| } |
| |
| private final Buffer buffers; |
| |
| public DataOutputByteBuffer() { |
| this(32); |
| } |
| |
| public DataOutputByteBuffer(int size) { |
| this(size, false); |
| } |
| |
| public DataOutputByteBuffer(int size, boolean direct) { |
| this(new Buffer(size, direct)); |
| } |
| |
| private DataOutputByteBuffer(Buffer buffers) { |
| super(buffers); |
| this.buffers = buffers; |
| } |
| |
| public ByteBuffer[] getData() { |
| return buffers.getData(); |
| } |
| |
| public int getLength() { |
| return buffers.getLength(); |
| } |
| |
| public void reset() { |
| this.written = 0; |
| buffers.reset(); |
| } |
| |
| } |