javaunohelper/com/sun/star/lib/uno/adapter/XOutputStreamToByteArrayAdapter.java

   1 /*
   2  * This file is part of the LibreOffice project.
   3  *
   4  * This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   7  *
   8  * This file incorporates work covered by the following license notice:
   9  *
  10  *   Licensed to the Apache Software Foundation (ASF) under one or more
  11  *   contributor license agreements. See the NOTICE file distributed
  12  *   with this work for additional information regarding copyright
  13  *   ownership. The ASF licenses this file to you under the Apache
  14  *   License, Version 2.0 (the "License"); you may not use this file
  15  *   except in compliance with the License. You may obtain a copy of
  16  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  17  */
  18 package com.sun.star.lib.uno.adapter;
  19
  20 import com.sun.star.io.*;
  21 import  com.sun.star.lib.uno.helper.ComponentBase;
  22
  23 public final class XOutputStreamToByteArrayAdapter
  24     extends ComponentBase
  25     implements XOutputStream
  26 {
  27     private static final int initialSize = 100240; // 10 kb
  28     private int size = 0;
  29     private int position = 0;
  30     private boolean externalBuffer = false;
  31     private byte[] buffer;
  32
  33     /** Creates a new instance of ByteArrayXOutputStream */
  34     public XOutputStreamToByteArrayAdapter() {
  35         this(null);
  36     }
  37
  38     public XOutputStreamToByteArrayAdapter(byte[] aBuffer) {
  39         if (aBuffer != null) {
  40             externalBuffer = true;
  41             buffer = aBuffer;
  42             size = buffer.length;
  43         } else {
  44             size = initialSize;
  45             buffer = new byte[size];
  46         }
  47     }
  48
  49     public byte[] getBuffer() {
  50         return buffer;
  51     }
  52
  53     public void closeOutput()
  54         throws com.sun.star.io.NotConnectedException,
  55             com.sun.star.io.BufferSizeExceededException,
  56             com.sun.star.io.IOException
  57     {
  58         // trim buffer
  59         if ( buffer.length > position && !externalBuffer )
  60         {
  61             byte[] newBuffer = new byte[position];
  62             System.arraycopy(buffer, 0, newBuffer, 0, position);
  63             buffer = newBuffer;
  64         }
  65     }
  66
  67     public void flush()
  68         throws com.sun.star.io.NotConnectedException,
  69             com.sun.star.io.BufferSizeExceededException,
  70             com.sun.star.io.IOException
  71     {
  72     }
  73
  74     public void writeBytes(byte[] values)
  75         throws com.sun.star.io.NotConnectedException,
  76             com.sun.star.io.BufferSizeExceededException,
  77             com.sun.star.io.IOException
  78     {
  79         if ( values.length > size-position )
  80         {
  81             if ( externalBuffer )
  82                 throw new BufferSizeExceededException("out of buffer space, cannot grow external buffer");
  83             while ( values.length > size-position ) {
  84                 size *= 2;
  85             }
  86             byte[] newBuffer = new byte[size];
  87             System.arraycopy(buffer, 0, newBuffer, 0, position);
  88             buffer = newBuffer;
  89         }
  90         System.arraycopy(values, 0, buffer, position, values.length);
  91         position += values.length;
  92     }
  93
  94 }