1 | /*
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2 | * RegexSearchReplace.java
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3 | * A task to delete from a given starting nugget to a given ending nugget or the end of the file
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4 | *
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5 | * Copyright (C) 2005 New Zealand Digital Library, http://www.nzdl.org
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6 | *
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7 | * This program is free software; you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation; either version 2 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * This program is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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20 | */
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21 | package org.greenstone.anttasks;
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22 |
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23 | import org.apache.tools.ant.*;
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24 | import org.apache.tools.ant.taskdefs.*;
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25 | import java.util.*;
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26 | import java.io.*;
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27 | import java.util.regex.*;
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28 |
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29 |
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30 | public class DeleteChunkFromFile extends Task {
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31 |
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32 | private File file = null;
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33 | private String startTag = null;
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34 | private String endTag = null;
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35 | private boolean leaveTags = false;
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36 |
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37 | public static void main( String[] args ) {
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38 |
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39 | DeleteChunkFromFile dcff = new DeleteChunkFromFile();
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40 | dcff.setFile(new File (args[0]));
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41 | dcff.setStartTag(args[1]);
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42 | dcff.setEndTag(args[2]);
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43 |
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44 | dcff.execute();
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45 |
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46 | }
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47 |
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48 | public void execute() {
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49 |
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50 | if ( file == null ) {
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51 | throw new BuildException( "Error - No file specified !!" );
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52 | }
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53 |
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54 | if ( startTag == null ) {
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55 | throw new BuildException( "Error - No startTag specified !!" );
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56 | }
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57 |
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58 | System.out.println( "File: " + file );
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59 | System.out.println( "StartTag: " + startTag );
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60 | System.out.println( "EndTag: " + endTag );
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61 | System.out.println( "LeaveTags: " + leaveTags );
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62 |
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63 | int noReplaces = 0;
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64 |
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65 | //create the output stream
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66 | BufferedWriter out = null;
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67 | File temp = null;
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68 | try {
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69 | //create temp file.
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70 | temp = File.createTempFile("dcff", ".tmp");
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71 |
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72 | //delete temp file when program exits.
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73 | temp.deleteOnExit();
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74 |
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75 | //writer to temp file
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76 | out = new BufferedWriter(new FileWriter(temp));
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77 |
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78 | } catch (IOException e) {
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79 | throw new BuildException( "Error - Couldn't create or open the temp file" );
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80 | }
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81 |
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82 |
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83 | //create the input stream
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84 | BufferedReader in = null;
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85 | try {
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86 | in = new BufferedReader( new FileReader( file ) );
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87 | } catch ( Exception e ) {
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88 | throw new BuildException( "Error - Couldn't open the specified file" );
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89 | }
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90 |
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91 | //pass the file through, searching and replacing
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92 | String line;
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93 | boolean hasMoreLines = true;
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94 | boolean lookingForStartTag = true;
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95 | while ( hasMoreLines ) {
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96 |
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97 | try {
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98 | line = in.readLine();
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99 | } catch ( Exception e ) {
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100 | throw new BuildException( "Error - Couldn't read from the specified file" );
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101 | }
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102 |
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103 | if ( line == null ) {
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104 | hasMoreLines = false;
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105 | } else {
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106 |
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107 | boolean writeLine = lookingForStartTag;
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108 |
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109 | if ( lookingForStartTag ) {
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110 | if ( line.matches( startTag ) ) {
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111 | lookingForStartTag = false;
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112 | writeLine = leaveTags;
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113 | }
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114 | } else {
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115 | if ( endTag != null && line.matches( endTag ) ) {
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116 | lookingForStartTag = true;
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117 | writeLine = leaveTags;
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118 | }
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119 | }
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120 |
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121 | if ( writeLine ) {
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122 | try {
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123 | out.write(line);
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124 | out.newLine();
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125 | } catch ( Exception e ) {
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126 | throw new BuildException( "Error - Couldn't write to the temp file" );
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127 | }
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128 | }
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129 | }
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130 | }
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131 |
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132 |
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133 | try {
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134 | //close them both up
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135 | in.close();
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136 | out.close();
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137 | } catch ( Exception e ) {
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138 | throw new BuildException( "Error - Couldn't close a file" );
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139 | }
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140 |
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141 |
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142 | //copy the new file (temp) over the original
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143 | InputStream i;
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144 | OutputStream o;
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145 | try {
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146 | i = new FileInputStream(temp);
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147 | o = new FileOutputStream(file);
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148 |
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149 | } catch ( Exception e ) {
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150 | throw new BuildException( "Error - Couldn't open the temp file" );
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151 | }
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152 |
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153 | try {
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154 |
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155 | // Transfer bytes from in to out
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156 | byte[] buf = new byte[1024];
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157 | int len;
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158 | while ((len = i.read(buf)) > 0) {
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159 | o.write(buf, 0, len);
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160 | }
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161 |
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162 | //close them up
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163 | i.close();
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164 | o.close();
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165 | } catch ( Exception e ) {
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166 | throw new BuildException( "Error - Couldn't write to the specified file" );
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167 | }
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168 |
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169 | System.out.println( "Finished" );
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170 | }
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171 |
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172 |
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173 | public void setFile(File file) {
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174 | this.file = file;
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175 | }
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176 |
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177 | public void setStartTag(String st) {
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178 | this.startTag = st;
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179 | }
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180 |
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181 | public void setEndTag(String et) {
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182 | this.endTag = et;
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183 | }
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184 |
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185 | public void setLeaveTags( boolean lt ) {
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186 | this.leaveTags = lt;
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187 | }
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188 |
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189 |
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190 | }
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