Mercurial > hg > blitz_stable
annotate src/com/go/trove/io/LinePositionReader.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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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 } |