Mercurial > hg > blitz_stable

annotate src/com/go/trove/io/PushbackPositionReader.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 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 }