001    /**
002     * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.servlet;
016    
017    import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayOutputStream;
018    import com.liferay.portal.kernel.util.UnsyncPrintWriterPool;
019    
020    import java.io.PrintWriter;
021    
022    import java.nio.ByteBuffer;
023    
024    import javax.servlet.ServletOutputStream;
025    import javax.servlet.http.HttpServletResponse;
026    
027    /**
028     * @author Shuyang Zhou
029     */
030    public class ByteBufferServletResponse extends HeaderCacheServletResponse {
031    
032            public ByteBufferServletResponse(HttpServletResponse response) {
033                    super(response);
034            }
035    
036            @Override
037            public int getBufferSize() {
038                    if (_byteBuffer != null) {
039                            return _byteBuffer.remaining();
040                    }
041                    else if (_unsyncByteArrayOutputStream != null) {
042                            return _unsyncByteArrayOutputStream.size();
043                    }
044                    else {
045                            return 0;
046                    }
047            }
048    
049            public ByteBuffer getByteBuffer() {
050                    if (_byteBuffer != null) {
051                            return _byteBuffer;
052                    }
053                    else if (_unsyncByteArrayOutputStream != null) {
054                            return _unsyncByteArrayOutputStream.unsafeGetByteBuffer();
055                    }
056                    else {
057                            return ByteBuffer.wrap(new byte[0]);
058                    }
059            }
060    
061            @Override
062            public ServletOutputStream getOutputStream() {
063                    if (_printWriter != null) {
064                            throw new IllegalStateException(
065                                    "Cannot obtain OutputStream because Writer is already in use");
066                    }
067    
068                    if (_servletOutputStream == null) {
069                            _unsyncByteArrayOutputStream = new UnsyncByteArrayOutputStream();
070                            _servletOutputStream = new PipingServletOutputStream(
071                                    _unsyncByteArrayOutputStream);
072                    }
073    
074                    return _servletOutputStream;
075            }
076    
077            @Override
078            public PrintWriter getWriter() {
079                    if (_printWriter != null) {
080                            return _printWriter;
081                    }
082    
083                    if (_servletOutputStream != null) {
084                            throw new IllegalStateException(
085                                    "Cannot obtain Writer because OutputStream is already in use");
086                    }
087    
088                    _unsyncByteArrayOutputStream = new UnsyncByteArrayOutputStream();
089                    _servletOutputStream = new PipingServletOutputStream(
090                            _unsyncByteArrayOutputStream);
091                    _printWriter = UnsyncPrintWriterPool.borrow(
092                            _unsyncByteArrayOutputStream);
093    
094                    return _printWriter;
095            }
096    
097            public void setByteBuffer(ByteBuffer byteBuffer) {
098                    _byteBuffer = byteBuffer;
099            }
100    
101            private ByteBuffer _byteBuffer;
102            private PrintWriter _printWriter;
103            private ServletOutputStream _servletOutputStream;
104            private UnsyncByteArrayOutputStream _unsyncByteArrayOutputStream;
105    
106    }