Mercurial > hg > blitz_stable
annotate src/com/go/trove/io/PushbackPositionReader.java @ 8:fa7203ea1622
Remove some dead code (Dave Brosius)
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 23 May 2009 11:27:41 +0100 |
parents | 3dc0c5604566 |
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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 PushbackPositionReader is a kind of pushback reader that tracks the |
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59 * postion in the stream of the next character to be read. |
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60 * The java.io.PushbackReader allows arbitrary characters |
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61 * to be pushed back. Since this Reader may need to keep track of how many |
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62 * characters were scanned from the underlying Reader to actually produce |
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63 * a character, the unread operation cannot accept any arbitrary character. |
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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 * @see java.io.PushbackReader |
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69 */ |
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70 public class PushbackPositionReader extends PositionReader { |
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71 /** Maximum pushback allowed. */ |
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72 private int mMaxPushback; |
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73 |
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74 /** Most recently read characters with escapes already processed. */ |
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75 private int[] mCharacters; |
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76 |
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77 /** The scan lengths of the most recently read characters. */ |
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78 private int[] mPositions; |
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79 |
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80 /** The cursor marks the position in the arrays of the last character. */ |
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81 private int mCursor; |
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82 |
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83 /** Amount of characters currently pushed back. */ |
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84 private int mPushback; |
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85 |
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86 public PushbackPositionReader(Reader reader) { |
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87 this(reader, 0); |
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88 } |
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89 |
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90 public PushbackPositionReader(Reader reader, int pushback) { |
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91 super(reader); |
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92 |
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93 // Two more are required for correct operation |
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94 pushback += 2; |
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95 |
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96 mMaxPushback = pushback; |
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97 mCharacters = new int[pushback]; |
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98 mPositions = new int[pushback]; |
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99 mCursor = 0; |
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100 mPushback = 0; |
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101 } |
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102 |
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103 /** |
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104 * @return the start position of the last read character. |
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105 */ |
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106 public int getStartPosition() { |
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107 int back = mCursor - 2; |
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108 if (back < 0) back += mMaxPushback; |
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109 |
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110 return mPositions[back]; |
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111 } |
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112 |
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113 public int read() throws IOException { |
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114 int c; |
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115 |
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116 if (mPushback > 0) { |
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117 mPushback--; |
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118 |
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119 mPosition = mPositions[mCursor]; |
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120 c = mCharacters[mCursor++]; |
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121 if (mCursor >= mMaxPushback) mCursor = 0; |
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122 |
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123 return c; |
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124 } |
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125 |
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126 c = super.read(); |
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127 |
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128 mPositions[mCursor] = mPosition; |
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129 mCharacters[mCursor++] = c; |
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130 if (mCursor >= mMaxPushback) mCursor = 0; |
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131 |
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132 return c; |
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133 } |
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134 |
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135 public int peek() throws IOException { |
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136 int c = read(); |
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137 unread(); |
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138 return c; |
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139 } |
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140 |
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141 /** |
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142 * Unread the last several characters read. |
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143 * |
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144 * <p>Unlike PushbackReader, unread does not allow arbitrary characters to |
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145 * to be unread. Rather, it functions like an undo operation. |
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146 * |
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147 * @param amount Amount of characters to unread. |
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148 * @see java.io.PushbackReader#unread(int) |
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149 */ |
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150 public void unread(int amount) throws IOException { |
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151 for (int i=0; i<amount; i++) { |
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152 unread(); |
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153 } |
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154 } |
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155 |
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156 /** |
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157 * Unread the last character read. |
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158 * |
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159 * <p>Unlike PushbackReader, unread does not allow arbitrary characters to |
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160 * to be unread. Rather, it functions like an undo operation. |
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161 * |
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162 * @see java.io.PushbackReader#unread(int) |
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163 */ |
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164 public void unread() throws IOException { |
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165 mPushback++; |
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166 |
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167 if (mPushback > mMaxPushback - 2) { |
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168 throw new IOException(this.getClass().getName() + |
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169 ": pushback exceeded " + (mMaxPushback - 2)); |
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170 } |
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171 |
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172 if ((--mCursor) < 0) mCursor += mMaxPushback; |
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173 |
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174 if (mCursor > 0) { |
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175 mPosition = mPositions[mCursor - 1]; |
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176 } |
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177 else { |
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178 mPosition = mPositions[mMaxPushback - 1]; |
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179 } |
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180 |
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181 unreadHook(mCharacters[mCursor]); |
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182 } |
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183 |
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184 /** |
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185 * A hook call from the unread method(s). Every unread character is |
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186 * passed to this method. |
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187 */ |
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188 protected void unreadHook(int c) { |
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189 } |
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190 } |