Mercurial > hg > blitz_stable

annotate src/com/go/trove/io/LinePositionReader.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 * LinePositionReader aids in printing line numbers for error reporting.
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59 *
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60 * @author Brian S O'Neill
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61 * @version
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62 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 12/11/00 <!-- $-->
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63 */
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64 public class LinePositionReader extends PositionReader {
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65 private int mLineNumber = 1;
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66 private int mPushback = -1;
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67
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68 public LinePositionReader(Reader reader) {
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69 super(reader);
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70 }
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71
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72 public int read() throws IOException {
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73 int c;
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74
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75 if (mPushback >= 0) {
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76 c = mPushback;
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77 mPushback = -1;
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78 }
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79 else {
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80 c = super.read();
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81 }
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82
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83 if (c == '\n') {
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84 mLineNumber++;
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85 }
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86 else if (c == '\r') {
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87 int peek = super.read();
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88 if (peek != '\n') {
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89 mLineNumber++;
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90 }
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91 mPushback = peek;
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92 }
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93
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94 return c;
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95 }
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96
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97 /**
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98 * After calling readLine, calling getLineNumber returns the next line
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99 * number.
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100 */
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101 public String readLine() throws IOException {
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102 StringBuffer buf = new StringBuffer(80);
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103 int line = mLineNumber;
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104 int c;
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105 while (line == mLineNumber && (c = read()) >= 0) {
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106 buf.append((char)c);
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107 }
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108 return buf.toString();
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109 }
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110
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111 /**
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112 * Skips forward into the stream to the line number specified. The line
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113 * can then be read by calling readLine. Calling getPosition
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114 * returns the position that the line begins.
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115 *
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116 * @return the line number reached
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117 */
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118 public int skipForwardToLine(int line) throws IOException {
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119 while (mLineNumber < line && read() >= 0) {}
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120 return mLineNumber;
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121 }
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122
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123 /**
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124 * @return the number of the line currently being read or the next one
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125 * available.
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126 */
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127 public int getLineNumber() {
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128 return mLineNumber;
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129 }
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130
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131 /**
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132 * Converts all whitespace characters in a String to space characters
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133 * (\u0020).
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134 */
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135 public static String cleanWhitespace(String str) {
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136 int length = str.length();
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137
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138 StringBuffer buf = new StringBuffer(length);
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139 for (int i=0; i<length; i++) {
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140 char c = str.charAt(i);
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141 if (Character.isWhitespace(c)) {
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142 buf.append(' ');
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143 }
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144 else {
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145 buf.append(c);
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146 }
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147 }
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148
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149 return buf.toString();
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150 }
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151
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152 /**
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153 * Creates and returns a String containing a sequence of the specified
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154 * length, repeating the given character.
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155 */
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156 public static String createSequence(char c, int length) {
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157 if (length < 0) length = 1;
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158
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159 StringBuffer buf = new StringBuffer(length);
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160 for (; length > 0; length--) {
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161 buf.append(c);
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162 }
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163 return buf.toString();
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164 }
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165 }