Mercurial > hg > blitz_stable

annotate src/com/go/trove/io/FileByteData.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 * Trove - Copyright (c) 1999-2000 Walt Disney Internet Group
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3 * ====================================================================
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4 * The Tea Software License, Version 1.1
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5 *
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 *
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 *
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in
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17 * the documentation and/or other materials provided with the
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18 * distribution.
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19 *
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20 * 3. The end-user documentation included with the redistribution,
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21 * if any, must include the following acknowledgment:
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22 * "This product includes software developed by the
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23 * Walt Disney Internet Group (http://opensource.go.com/)."
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24 * Alternately, this acknowledgment may appear in the software itself,
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25 * if and wherever such third-party acknowledgments normally appear.
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26 *
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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28 * not be used to endorse or promote products derived from this
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29 * software without prior written permission. For written
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30 * permission, please contact opensource@dig.com.
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31 *
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32 * 5. Products derived from this software may not be called "Tea",
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
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35 * written permission of the Walt Disney Internet Group.
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36 *
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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48 * ====================================================================
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49 *
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50 * For more information about Tea, please see http://opensource.go.com/.
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51 */
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52
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53 package com.go.trove.io;
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54
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55 import java.io.OutputStream;
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56 import java.io.File;
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57 import java.io.RandomAccessFile;
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58 import java.io.IOException;
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59
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60 /******************************************************************************
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61 * A ByteData implementation that reads the contents of a file.
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62 *
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63 * @author Brian S O'Neill
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64 * @version
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65 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/12/06 <!-- $-->
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66 */
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67 public class FileByteData implements ByteData {
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68 private static final Object NULL = new Object();
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69
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70 private File mFile;
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71
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72 // Thread-local reference to a RandomAccessFile.
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73 private ThreadLocal mRAF = new ThreadLocal();
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74
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75 public FileByteData(File file) {
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76 mFile = file;
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77 // Open here so that if file isn't found, error is logged earlier.
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78 open();
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79 }
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80
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81 public long getByteCount() throws IOException {
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82 // Keep file open to ensure that length doesn't change between call to
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83 // getByteCount and writeTo.
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84
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85 RandomAccessFile raf = open();
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86 if (raf == null) {
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87 return 0;
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88 }
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89 else {
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90 return raf.length();
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91 }
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92 }
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93
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94 public void writeTo(OutputStream out) throws IOException {
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95 RandomAccessFile raf = open();
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96 if (raf == null) {
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97 return;
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98 }
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99
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100 try {
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101 long length = raf.length();
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102 int bufSize;
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103 if (length > 4000) {
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104 bufSize = 4000;
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105 }
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106 else {
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107 bufSize = (int)length;
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108 }
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109
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110 byte[] inputBuffer = new byte[bufSize];
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111
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112 raf.seek(0);
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113
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114 int readAmount;
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115 while ((readAmount = raf.read(inputBuffer, 0, bufSize)) > 0) {
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116 out.write(inputBuffer, 0, readAmount);
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117 }
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118 }
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119 finally {
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120 try {
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121 finalize();
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122 }
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123 catch (IOException e) {
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124 }
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125 }
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126 }
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127
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128 public void reset() throws IOException {
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129 Object obj = mRAF.get();
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130 try {
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131 if (obj instanceof RandomAccessFile) {
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132 ((RandomAccessFile)obj).close();
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133 }
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134 }
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135 finally {
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136 mRAF.set(null);
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137 }
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138 }
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139
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140 protected final void finalize() throws IOException {
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141 reset();
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142 }
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143
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144 private RandomAccessFile open() {
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145 Object obj = mRAF.get();
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146 if (obj instanceof RandomAccessFile) {
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147 return (RandomAccessFile)obj;
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148 }
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149 else if (obj == NULL) {
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150 return null;
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151 }
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152
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153 RandomAccessFile raf = null;
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154
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155 try {
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156 raf = new RandomAccessFile(mFile, "r");
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157 mRAF.set(raf);
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158 }
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159 catch (IOException e) {
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160 mRAF.set(NULL);
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161 Thread t = Thread.currentThread();
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162 t.getThreadGroup().uncaughtException(t, e);
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163 }
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164
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165 return raf;
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166 }
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167 }