Mercurial > hg > blitz_stable

annotate src/com/go/trove/io/PositionReader.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) 1997-2000 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.*;
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56
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57 /******************************************************************************
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58 * The PositionReader tracks the postion in the stream of the next character
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59 * to be read. PositionReaders chain together such that the position is
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60 * read from the earliest PositionReader in the chain.
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61 *
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62 * <p>Position readers automatically close the underlying input stream when
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63 * the end of file is reached. Ordinary input streams don't do this.
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64 *
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65 * @author Brian S O'Neill
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66 * @version
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67 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 12/11/00 <!-- $-->
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68 */
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69 public class PositionReader extends FilterReader {
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70 /** Is non-null when this PositionReader is chained to another. */
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71 protected PositionReader mPosReader;
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72
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73 protected int mPosition = 0;
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74
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75 private boolean mClosed = false;
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76
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77 public PositionReader(Reader reader) {
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78 super(reader);
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79 if (reader instanceof PositionReader) {
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80 mPosReader = (PositionReader)reader;
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81 }
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82 }
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83
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84 /**
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85 * @return the position of the next character to be read.
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86 */
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87 public int getNextPosition() {
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88 return mPosition;
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89 }
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90
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91 public int read() throws IOException {
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92 try {
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93 int c;
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94 if ((c = in.read()) != -1) {
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95 if (mPosReader == null) {
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96 mPosition++;
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97 }
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98 else {
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99 mPosition = mPosReader.getNextPosition();
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100 }
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101 }
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102 else {
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103 close();
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104 }
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105
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106 return c;
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107 }
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108 catch (IOException e) {
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109 if (mClosed) {
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110 return -1;
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111 }
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112 else {
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113 throw e;
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114 }
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115 }
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116 }
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117
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118 public int read(char[] buf, int off, int length) throws IOException {
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119 int i = 0;
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120 while (i < length) {
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121 int c;
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122 if ((c = read()) == -1) {
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123 return (i == 0)? -1 : i;
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124 }
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125 buf[i++ + off] = (char)c;
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126 }
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127
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128 return i;
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129 }
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130
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131 public void close() throws IOException {
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132 mClosed = true;
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133 super.close();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
134 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
135 }