| /* |
| * |
| * 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.qpid.server.bytebuffer; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.util.LinkedList; |
| |
| final class QpidByteBufferOutputStream extends OutputStream |
| { |
| private final LinkedList<QpidByteBuffer> _buffers = new LinkedList<>(); |
| private int _bufferPosition = 0; |
| private final byte[] _buffer; |
| private final boolean _isDirect; |
| private final int _maximumBufferSize; |
| private boolean _closed; |
| |
| public QpidByteBufferOutputStream(final boolean isDirect, final int maximumBufferSize) |
| { |
| if (maximumBufferSize <= 0) |
| { |
| throw new IllegalArgumentException("Negative or zero maximumBufferSize illegal : " + maximumBufferSize); |
| } |
| _isDirect = isDirect; |
| _maximumBufferSize = maximumBufferSize; |
| _buffer = new byte[_maximumBufferSize]; |
| } |
| |
| @Override |
| public void write(int b) throws IOException |
| { |
| write(new byte[] {(byte)b}); |
| } |
| |
| @Override |
| public void write(byte[] data) throws IOException |
| { |
| write(data, 0, data.length); |
| } |
| |
| @Override |
| public void write(byte[] data, int offset, int len) throws IOException |
| { |
| allocateDataBuffers(data, offset, len); |
| } |
| |
| @Override |
| public void close() throws IOException |
| { |
| _closed = true; |
| _buffers.forEach(QpidByteBuffer::dispose); |
| _buffers.clear(); |
| } |
| |
| QpidByteBuffer fetchAccumulatedBuffer() |
| { |
| if (_bufferPosition != 0) |
| { |
| addSingleQpidByteBuffer(_buffer, 0, _bufferPosition); |
| } |
| final QpidByteBuffer combined = QpidByteBuffer.concatenate(_buffers); |
| return combined; |
| } |
| |
| private void allocateDataBuffers(byte[] data, int offset, int len) throws IOException |
| { |
| if (_closed) |
| { |
| throw new IOException("Stream is closed"); |
| } |
| |
| do |
| { |
| int bytesWeCanWrite = Math.min(_buffer.length - _bufferPosition, len); |
| System.arraycopy(data, offset, _buffer, _bufferPosition, bytesWeCanWrite); |
| offset += bytesWeCanWrite; |
| len -= bytesWeCanWrite; |
| _bufferPosition += bytesWeCanWrite; |
| if (_buffer.length == _bufferPosition) |
| { |
| addSingleQpidByteBuffer(_buffer, 0, _buffer.length); |
| } |
| } while (len != 0); |
| } |
| |
| private void addSingleQpidByteBuffer(final byte[] buffer, final int offset, final int length) |
| { |
| QpidByteBuffer current = _isDirect |
| ? QpidByteBuffer.allocateDirect(length) |
| : QpidByteBuffer.allocate(length); |
| current.put(buffer, offset, length); |
| current.flip(); |
| _buffers.add(current); |
| _bufferPosition = 0; |
| } |
| } |