1 | /**
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2 | *#########################################################################
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3 | *
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4 | * A component of the Gatherer application, part of the Greenstone digital
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5 | * library suite from the New Zealand Digital Library Project at the
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6 | * University of Waikato, New Zealand.
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7 | *
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8 | * Author: John Thompson, Greenstone Digital Library, University of Waikato
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9 | *
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10 | * Copyright (C) 1999 New Zealand Digital Library Project
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11 | *
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12 | * This program is free software; you can redistribute it and/or modify
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13 | * it under the terms of the GNU General Public License as published by
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14 | * the Free Software Foundation; either version 2 of the License, or
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15 | * (at your option) any later version.
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16 | *
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17 | * This program is distributed in the hope that it will be useful,
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18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | * GNU General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, write to the Free Software
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24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | *########################################################################
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26 | */
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27 | package org.greenstone.gatherer.cdm;
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28 |
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29 | import java.io.*;
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30 | import java.util.*;
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31 | import org.greenstone.gatherer.DebugStream;
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32 | import org.greenstone.gatherer.greenstone.Plugins;
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33 | import org.greenstone.gatherer.util.StaticStrings;
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34 | import org.w3c.dom.*;
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35 |
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36 |
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37 | /** This class is responsible for storing information from a parsed pluginfo call in such a way that it allows easy access to parsed details for the purposes of user design and specification of plugins. */
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38 | public class Plugin
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39 | extends ArgumentContainer
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40 | {
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41 | private String default_block_expression = "";
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42 | private String default_process_expression = "";
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43 | private boolean does_explode_metadata_databases = false;
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44 | private boolean loading_options_failed = false;
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45 |
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46 |
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47 | /** Constructor used in DOMProxyListModel initializations, and Library Level. Used for Base plugins (those in the list of available plugins, not ones that are in the DOMProxyList)
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48 | */
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49 | public Plugin() {
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50 | }
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51 |
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52 |
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53 | public Plugin(Element element, Plugin base_plugin) {
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54 | super(element, base_plugin);
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55 | }
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56 |
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57 |
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58 | /** Method to compare two plugins for ordering.
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59 | * We override the base method cos we compare by plugin name rather than toString()
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60 | */
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61 | public int compareTo(Object object) {
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62 | if(object instanceof Plugin) {
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63 | return name.compareTo(((Plugin)object).getName());
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64 | }
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65 | return -1;
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66 | }
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67 |
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68 |
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69 | /** The assigned plugin constructor.
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70 | * @param element the DOM Element this plugin is based upon
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71 | */
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72 | public DOMProxyListEntry create(Element element) {
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73 | String plugin_name = element.getAttribute(StaticStrings.TYPE_ATTRIBUTE);
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74 | // Determine the base plugin from the plugin name
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75 | Plugin base_plugin = Plugins.getPlugin(plugin_name, true);
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76 | Plugin plugin = new Plugin(element, base_plugin);
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77 | if (base_plugin == null) {
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78 | plugin.setAssigned(false);
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79 | }
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80 | base_plugin = null;
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81 | plugin_name = null;
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82 | return plugin;
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83 | }
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84 |
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85 |
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86 | public boolean didLoadingOptionsFail()
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87 | {
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88 | return loading_options_failed;
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89 | }
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90 |
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91 |
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92 | /** Checks whether the plugin this instance is based on processes metadata databases that can be exploded. */
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93 | public boolean doesExplodeMetadataDatabases()
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94 | {
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95 | Plugin base_plugin = Plugins.getPlugin(getName(), false);
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96 | if (base_plugin == null) {
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97 | return false;
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98 | }
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99 | return base_plugin.does_explode_metadata_databases;
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100 | }
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101 |
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102 |
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103 | /** Checks whether this plugin instance will process the specified file (given its block_exp). */
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104 | public boolean doesBlockFile(File file)
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105 | {
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106 | // Check the filename against the plugin's block_exp value
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107 | ArrayList arguments = getArguments();
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108 | for (int i = 0; i < arguments.size(); i++) {
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109 | Argument argument = (Argument) arguments.get(i);
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110 | if (argument.getName().equals("block_exp")) {
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111 | // Try the assigned value first, for when the user has manually set the value
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112 | String regular_expression = argument.getValue();
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113 | if (regular_expression == null || regular_expression.equals("")) {
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114 | // Not set, so use the default value
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115 | regular_expression = argument.getDefaultValue();
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116 | if (regular_expression.equals("")) {
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117 | continue;
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118 | }
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119 | }
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120 |
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121 | if (doesFileMatchRegularExpression(file, regular_expression)) {
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122 | return true;
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123 | }
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124 | }
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125 | }
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126 |
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127 | // Try the plugin's default block expression
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128 | if (!default_block_expression.equals("") && doesFileMatchRegularExpression(file, default_block_expression)) {
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129 | return true;
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130 | }
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131 |
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132 | // This plugin will (probably) not deal with the specified file
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133 | return false;
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134 | }
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135 |
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136 |
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137 | /** Checks whether this plugin instance will process the specified file (given its process_exp). */
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138 | public boolean doesProcessFile(File file)
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139 | {
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140 | // Check the filename against the plugin's process_exp value
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141 | ArrayList arguments = getArguments();
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142 | for (int i = 0; i < arguments.size(); i++) {
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143 | Argument argument = (Argument) arguments.get(i);
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144 | if (argument.getName().equals("process_exp")) {
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145 | // Try the assigned value first, for when the user has manually set the value
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146 | String regular_expression = argument.getValue();
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147 | if (regular_expression == null || regular_expression.equals("")) {
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148 | // Not set, so use the default value
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149 | regular_expression = argument.getDefaultValue();
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150 | if (regular_expression.equals("")) {
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151 | continue;
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152 | }
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153 | }
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154 |
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155 | if (doesFileMatchRegularExpression(file, regular_expression)) {
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156 | return true;
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157 | }
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158 | }
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159 | }
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160 |
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161 | // Try the plugin's default process expression
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162 | if (!default_process_expression.equals("") && doesFileMatchRegularExpression(file, default_process_expression)) {
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163 | return true;
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164 | }
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165 |
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166 | // This plugin will (probably) not deal with the specified file
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167 | return false;
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168 | }
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169 |
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170 |
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171 | private boolean doesFileMatchRegularExpression(File file, String regular_expression)
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172 | {
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173 | // The $ at the end doesn't seem to work in Java, so need to add ".*" at the start
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174 | if (regular_expression.startsWith("(?i)")) {
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175 | // Don't mess up case-insensitive matching though
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176 | regular_expression = "(?i)" + ".*" + regular_expression.substring("(?i)".length());
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177 | }
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178 | else {
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179 | regular_expression = ".*" + regular_expression;
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180 | }
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181 |
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182 | // If the filename matches the regular expression, this plugin will deal with the file in some way
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183 | if (file.getName().matches(regular_expression)) {
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184 | return true;
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185 | }
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186 |
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187 | return false;
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188 | }
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189 |
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190 |
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191 | public boolean isSeparator() {
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192 | return (element != null && element.getAttribute(StaticStrings.SEPARATOR_ATTRIBUTE).equals(StaticStrings.TRUE_STR));
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193 | }
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194 |
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195 |
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196 | public void setDefaultBlockExpression(String default_block_expression)
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197 | {
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198 | this.default_block_expression = default_block_expression;
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199 | }
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200 |
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201 |
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202 | public void setDefaultProcessExpression(String default_process_expression)
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203 | {
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204 | this.default_process_expression = default_process_expression;
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205 | }
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206 |
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207 |
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208 | public void setDoesExplodeMetadataDatabases(boolean does_explode_metadata_databases)
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209 | {
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210 | this.does_explode_metadata_databases = does_explode_metadata_databases;
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211 | }
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212 |
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213 |
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214 | public void setLoadingOptionsFailed()
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215 | {
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216 | this.loading_options_failed = true;
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217 | }
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218 | }
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