Mercurial > hg > blitz_stable

annotate src/org/prevayler/implementation/DelegatingByteCountStream.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /*
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2 The copyright of all source code included in this Prevayler distribution is
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3 held by Klaus Wuestefeld, except the files that specifically state otherwise.
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4 All rights are reserved. "PREVAYLER" is a trademark of Klaus Wuestefeld.
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5
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6
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7 BSD License:
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8
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9 Redistribution and use in source and binary forms, with or without
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10 modification, are permitted provided that the following conditions are met:
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11
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12 - Redistributions of source code must retain the above copyright notice, this
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13 list of conditions and the following disclaimer.
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14
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15 - Redistributions in binary form must reproduce the above copyright notice,
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16 this list of conditions and the following disclaimer in the documentation
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17 and/or other materials provided with the distribution.
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18
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19 - Neither the name of Prevayler nor the names of its contributors may be used
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20 to endorse or promote products derived from this software without specific
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21 prior written permission.
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22
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23
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24 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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25 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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26 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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27 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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28 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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29 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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30 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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31 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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32 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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33 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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34 POSSIBILITY OF SUCH DAMAGE.
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35 */
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36
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37 package org.prevayler.implementation;
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38
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39 import java.io.*;
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40
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41 /**
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42 A FileOutputStream that counts the number of bytes written and forces all
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43 buffers to synchronize with the underlying device when flushed.
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44 */
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45 final class DelegatingByteCountStream extends OutputStream {
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46 private OutputStream theBuffer;
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47 private FileOutputStream theFile;
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48
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49
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50 DelegatingByteCountStream(File file, int aBufferSize)
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51 throws IOException {
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52
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53 // System.err.println("Buffer size: " + aBufferSize);
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54
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55 System.err.println("Open: " + file);
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56
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57 theFile = new FileOutputStream(file);
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58
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59 if (aBufferSize > 0)
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60 theBuffer = new BufferedOutputStream(theFile, aBufferSize);
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61 else
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62 theBuffer = null;
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63 }
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64
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65 public void close() throws IOException {
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66 // System.err.println("Close");
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67
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68 flush();
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69 getTopStream().close();
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70 }
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71
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72 public void flush() throws IOException {
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73 // System.err.println("Flush");
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74
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75 /*
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76 "The flush method of OutputStream does nothing." - JDK1.3 API
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77 documentation. I'm calling it just in case it starts doing
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78 something in a future version of FileOutputStream or
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79 OutputStream.
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80 */
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81 getTopStream().flush();
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82
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83 /*
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84 As we're JDK 1.4, this saves a bit of time because we don't
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85 bother flushing meta data (we only care about flushing content)
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86 */
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87 theFile.getChannel().force(false);
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88
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89 // Original
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90 // getFD().sync(); //"Force all system buffers to synchronize with the underlying device." - JDK1.3 API documentation.
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91 }
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92
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93 private OutputStream getTopStream() {
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94 if (theBuffer == null)
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95 return theFile;
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96 else
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97 return theBuffer;
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98 }
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99
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100 public void write(byte[] b) throws IOException {
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101 getTopStream().write(b);
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102 bytesWritten += b.length;
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103 }
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104
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105 public void write(byte[] b, int off, int len) throws IOException {
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106 getTopStream().write(b, off, len);
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107 bytesWritten += len;
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108 }
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109
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110 public void write(int b) throws IOException {
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111 getTopStream().write(b);
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112 ++bytesWritten;
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113 }
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114
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115 public long bytesWritten() {
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116 return bytesWritten;
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117 }
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118
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119 private long bytesWritten;
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120 }