1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | |
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15 | package de.ugoe.cs.autoquest.plugin.html; |
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16 | |
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17 | import java.io.File; |
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18 | import java.io.FileInputStream; |
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19 | import java.io.FileNotFoundException; |
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20 | import java.io.IOException; |
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21 | import java.io.InputStreamReader; |
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22 | import java.io.UnsupportedEncodingException; |
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23 | import java.util.Collection; |
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24 | import java.util.HashMap; |
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25 | import java.util.LinkedList; |
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26 | import java.util.List; |
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27 | import java.util.Map; |
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28 | |
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29 | import javax.xml.parsers.ParserConfigurationException; |
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30 | import javax.xml.parsers.SAXParser; |
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31 | import javax.xml.parsers.SAXParserFactory; |
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32 | |
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33 | import org.xml.sax.Attributes; |
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34 | import org.xml.sax.InputSource; |
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35 | import org.xml.sax.Locator; |
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36 | import org.xml.sax.SAXException; |
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37 | import org.xml.sax.SAXParseException; |
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38 | import org.xml.sax.helpers.DefaultHandler; |
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39 | |
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40 | import de.ugoe.cs.autoquest.eventcore.Event; |
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41 | import de.ugoe.cs.autoquest.eventcore.guimodel.GUIElementTree; |
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42 | import de.ugoe.cs.autoquest.eventcore.guimodel.GUIModel; |
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43 | import de.ugoe.cs.util.console.Console; |
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44 | |
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45 | /** |
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46 | * <p> |
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47 | * This class provides the functionality to parse XML log files generated monitors of |
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48 | * AutoQUEST. The result of parsing a file is a collection of event sequences and a GUI model. |
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49 | * This class must be extended by implementing a subclass and the abstract method to complete |
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50 | * the implementation. |
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51 | * </p> |
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52 | * |
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53 | * @author Patrick Harms |
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54 | * @version 1.0 |
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55 | * |
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56 | */ |
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57 | public abstract class AbstractDefaultLogParser extends DefaultHandler { |
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58 | |
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59 | /** |
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60 | * <p> |
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61 | * Collection of event sequences that is contained in the parsed log file. |
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62 | * </p> |
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63 | */ |
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64 | private Collection<List<Event>> sequences; |
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65 | |
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66 | /** |
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67 | * <p> |
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68 | * Internal handle to the parsed GUI structure, stored in a GUIElementTree |
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69 | * </p> |
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70 | */ |
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71 | private GUIElementTree<String> guiElementTree; |
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72 | |
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73 | /** |
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74 | * <p> |
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75 | * Id of the GUI element currently being parsed. |
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76 | * </p> |
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77 | */ |
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78 | private String currentGUIElementId; |
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79 | |
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80 | /** |
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81 | * <p> |
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82 | * the buffer for GUI elements already parsed but not processed yet (because e.g. the parent |
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83 | * GUI element has not been parsed yet) |
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84 | * </p> |
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85 | */ |
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86 | private List<BufferEntry> guiElementBuffer; |
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87 | |
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88 | /** |
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89 | * <p> |
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90 | * Internal handle to type of the event currently being parsed. |
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91 | * </p> |
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92 | */ |
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93 | private String currentEventType; |
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94 | |
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95 | /** |
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96 | * <p> |
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97 | * the buffer for events already parsed but not processed yet (because e.g. the target |
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98 | * GUI element has not been parsed yet) |
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99 | * </p> |
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100 | */ |
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101 | private List<BufferEntry> eventBuffer; |
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102 | |
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103 | /** |
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104 | * <p> |
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105 | * Internal handle to the parameters of the event currently being entity. |
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106 | * </p> |
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107 | */ |
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108 | private Map<String, String> currentParameters; |
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109 | |
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110 | /** |
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111 | * <p> |
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112 | * Internal handle to the sequence currently being parsed. |
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113 | * </p> |
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114 | */ |
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115 | private List<Event> currentSequence; |
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116 | |
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117 | /** |
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118 | * <p> |
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119 | * the handle to the locator for correctly throwing exceptions with location information |
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120 | * </p> |
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121 | */ |
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122 | private Locator locator; |
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123 | |
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124 | /** |
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125 | * <p> |
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126 | * Constructor. Creates a new logParser. |
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127 | * </p> |
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128 | */ |
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129 | public AbstractDefaultLogParser() { |
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130 | sequences = new LinkedList<List<Event>>(); |
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131 | guiElementTree = new GUIElementTree<String>(); |
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132 | guiElementBuffer = new LinkedList<BufferEntry>(); |
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133 | eventBuffer = new LinkedList<BufferEntry>(); |
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134 | currentSequence = new LinkedList<Event>(); |
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135 | } |
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136 | |
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137 | /** |
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138 | * <p> |
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139 | * Parses a log file written by the HTMLMonitor and creates a collection of event sequences. |
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140 | * </p> |
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141 | * |
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142 | * @param filename |
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143 | * name and path of the log file |
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144 | * |
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145 | * @throws SAXException in the case, the file could not be parsed |
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146 | */ |
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147 | public void parseFile(String filename) throws SAXException { |
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148 | if (filename == null) { |
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149 | throw new IllegalArgumentException("filename must not be null"); |
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150 | } |
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151 | |
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152 | parseFile(new File(filename)); |
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153 | } |
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154 | |
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155 | /** |
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156 | * <p> |
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157 | * Parses a log file written by the HTMLMonitor and creates a collection of event sequences. |
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158 | * </p> |
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159 | * |
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160 | * @param file |
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161 | * file to be parsed |
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162 | * |
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163 | * @throws SAXException in the case, the file could not be parsed |
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164 | */ |
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165 | public void parseFile(File file) throws SAXException { |
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166 | if (file == null) { |
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167 | throw new IllegalArgumentException("file must not be null"); |
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168 | } |
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169 | SAXParserFactory spf = SAXParserFactory.newInstance(); |
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170 | spf.setValidating(true); |
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171 | SAXParser saxParser = null; |
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172 | InputSource inputSource = null; |
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173 | try { |
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174 | saxParser = spf.newSAXParser(); |
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175 | inputSource = |
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176 | new InputSource(new InputStreamReader(new FileInputStream(file), "UTF-8")); |
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177 | } |
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178 | catch (UnsupportedEncodingException e) { |
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179 | Console.printerrln("Error parsing file " + file.getName()); |
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180 | Console.logException(e); |
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181 | throw new SAXParseException("Error parsing file " + file.getName(), locator, e); |
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182 | } |
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183 | catch (ParserConfigurationException e) { |
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184 | Console.printerrln("Error parsing file " + file.getName()); |
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185 | Console.logException(e); |
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186 | throw new SAXParseException("Error parsing file " + file.getName(), locator, e); |
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187 | } |
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188 | catch (FileNotFoundException e) { |
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189 | Console.printerrln("Error parsing file " + file.getName()); |
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190 | Console.logException(e); |
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191 | throw new SAXParseException("Error parsing file " + file.getName(), locator, e); |
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192 | } |
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193 | |
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194 | if (inputSource != null) { |
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195 | inputSource.setSystemId("file://" + file.getAbsolutePath()); |
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196 | try { |
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197 | if (saxParser == null) { |
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198 | throw new RuntimeException("SaxParser creation failed"); |
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199 | } |
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200 | saxParser.parse(inputSource, this); |
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201 | } |
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202 | catch (IOException e) { |
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203 | Console.printerrln("Error parsing file " + file.getName()); |
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204 | Console.logException(e); |
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205 | throw new SAXParseException("Error parsing file " + file.getName(), locator, e); |
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206 | } |
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207 | catch (SAXParseException e) { |
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208 | if ("XML document structures must start and end within the same entity.".equals |
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209 | (e.getMessage())) |
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210 | { |
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211 | // this only denotes, that the final session tag is missing, because the |
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212 | // file wasn't completed. Ignore this but complete the session |
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213 | eventBuffer.add(new BufferEntry("sessionSwitch", null)); |
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214 | processEvents(); |
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215 | } |
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216 | else { |
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217 | throw e; |
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218 | } |
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219 | } |
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220 | } |
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221 | } |
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222 | |
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223 | /** |
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224 | * <p> |
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225 | * Returns a collection of event sequences that was obtained from parsing log files. |
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226 | * </p> |
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227 | * |
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228 | * @return |
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229 | */ |
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230 | public Collection<List<Event>> getSequences() { |
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231 | return sequences; |
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232 | } |
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233 | |
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234 | /** |
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235 | * <p> |
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236 | * Returns the GUI model that is obtained from parsing log files. |
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237 | * </p> |
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238 | * |
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239 | * @return GUIModel |
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240 | */ |
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241 | public GUIModel getGuiModel() { |
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242 | return guiElementTree.getGUIModel(); |
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243 | } |
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244 | |
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245 | /* (non-Javadoc) |
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246 | * @see org.xml.sax.helpers.DefaultHandler#setDocumentLocator(org.xml.sax.Locator) |
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247 | */ |
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248 | @Override |
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249 | public void setDocumentLocator(Locator locator) { |
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250 | this.locator = locator; |
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251 | } |
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252 | |
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253 | /* |
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254 | * (non-Javadoc) |
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255 | * |
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256 | * @see org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String, java.lang.String, |
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257 | * java.lang.String, org.xml.sax.Attributes) |
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258 | */ |
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259 | @Override |
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260 | public void startElement(String uri, String localName, String qName, Attributes atts) |
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261 | throws SAXException |
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262 | { |
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263 | if (qName.equals("session")) { |
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264 | // do nothing |
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265 | } |
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266 | else if (qName.equals("component")) { |
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267 | currentGUIElementId = atts.getValue("id"); |
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268 | currentParameters = new HashMap<String, String>(); |
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269 | } |
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270 | else if (qName.equals("event")) { |
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271 | currentEventType = atts.getValue("type"); |
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272 | currentParameters = new HashMap<String, String>(); |
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273 | } |
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274 | else if (qName.equals("param")) { |
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275 | String paramName = atts.getValue("name"); |
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276 | if ((currentGUIElementId != null) || (currentEventType != null)) { |
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277 | currentParameters.put(paramName, atts.getValue("value")); |
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278 | } |
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279 | else { |
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280 | throw new SAXException("param tag found where it should not be."); |
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281 | } |
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282 | } |
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283 | else { |
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284 | throw new SAXException("unknown tag found: " + qName); |
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285 | } |
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286 | |
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287 | } |
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288 | |
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289 | /* |
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290 | * (non-Javadoc) |
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291 | * |
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292 | * @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String, java.lang.String, |
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293 | * java.lang.String) |
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294 | */ |
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295 | @Override |
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296 | public void endElement(String uri, String localName, String qName) throws SAXException { |
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297 | if (qName.equals("session") && (eventBuffer != null)) { |
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298 | eventBuffer.add(new BufferEntry("sessionSwitch", null)); |
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299 | processEvents(); |
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300 | } |
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301 | else if (qName.equals("component") && (currentGUIElementId != null)) { |
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302 | guiElementBuffer.add(new BufferEntry(currentGUIElementId, currentParameters)); |
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303 | |
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304 | processGUIElements(); |
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305 | |
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306 | currentGUIElementId = null; |
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307 | currentParameters = null; |
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308 | } |
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309 | else if (qName.equals("event") && (currentEventType != null)) { |
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310 | eventBuffer.add(new BufferEntry(currentEventType, currentParameters)); |
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311 | |
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312 | processEvents(); |
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313 | |
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314 | currentEventType = null; |
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315 | currentParameters = null; |
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316 | } |
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317 | } |
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318 | |
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319 | /** |
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320 | * <p> |
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321 | * called to handle parsed GUI elements |
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322 | * </p> |
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323 | * |
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324 | * @param id the id of the parsed GUI element |
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325 | * @param parameters all parameters parsed for the GUI element |
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326 | * |
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327 | * @return true, if the GUI element could be handled. In this case this method is not called |
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328 | * again for the same GUI element. Otherwise the method is called later again. This |
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329 | * may be required, if a child GUI element is parsed before the parent GUI element |
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330 | */ |
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331 | protected abstract boolean handleGUIElement(String id, Map<String, String> parameters) |
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332 | throws SAXException; |
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333 | |
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334 | /** |
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335 | * <p> |
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336 | * called to handle parsed events |
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337 | * </p> |
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338 | * |
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339 | * @param type the type of the parsed event |
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340 | * @param parameters the parameters of the parsed event |
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341 | * |
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342 | * @return true, if the event could be handled. In this case this method is not called |
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343 | * again for the same event. Otherwise the method is called later again. This |
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344 | * may be required, if e.g. the target of the event, i.e. the GUI element, is not yet |
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345 | * parsed |
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346 | */ |
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347 | protected abstract boolean handleEvent(String type, Map<String, String> parameters) |
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348 | throws SAXException; |
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349 | |
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350 | /** |
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351 | * <p> |
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352 | * returns the tree of parsed GUI elements, which consists of the ids of the GUI elements |
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353 | * </p> |
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354 | * |
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355 | * @return as described |
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356 | */ |
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357 | protected GUIElementTree<String> getGUIElementTree() { |
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358 | return guiElementTree; |
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359 | } |
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360 | |
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361 | /** |
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362 | * <p> |
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363 | * adds an event to the currently parsed sequence of events |
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364 | * </p> |
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365 | * |
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366 | * @param event |
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367 | */ |
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368 | protected void addToSequence(Event event) { |
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369 | currentSequence.add(event); |
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370 | } |
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371 | |
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372 | /** |
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373 | * <p> |
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374 | * this method internally processes GUI elements, that have been parsed but not processed yet. |
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375 | * I.e., for such GUI elements, either the method {@link #handleGUIElement(String, Map)} has |
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376 | * not been called yet, or it returned false for the previous calls. In this case, the method |
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377 | * is called (again). Furthermore, the processing of events is initiated by a call to |
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378 | * {@link #processEvents()}. |
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379 | * </p> |
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380 | */ |
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381 | private void processGUIElements() throws SAXException { |
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382 | int processedElements = 0; |
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383 | boolean processedElement; |
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384 | |
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385 | do { |
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386 | processedElement = false; |
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387 | // search for the next GUI element that can be processed |
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388 | for (int i = 0; i < guiElementBuffer.size(); i++) { |
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389 | BufferEntry entry = guiElementBuffer.get(i); |
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390 | processedElement = handleGUIElement(entry.id, entry.parameters); |
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391 | if (processedElement) { |
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392 | guiElementBuffer.remove(i); |
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393 | processedElements++; |
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394 | break; |
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395 | } |
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396 | } |
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397 | } |
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398 | while (processedElement); |
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399 | |
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400 | if (processedElements > 0) { |
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401 | processEvents(); |
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402 | } |
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403 | } |
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404 | |
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405 | /** |
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406 | * <p> |
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407 | * this method internally processes events, that have been parsed but not processed yet. |
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408 | * I.e., for such events, either the method {@link #handleEvent(String, Map)} has |
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409 | * not been called yet, or it returned false for the previous calls. In this case, the method |
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410 | * is called (again). |
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411 | * </p> |
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412 | */ |
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413 | private void processEvents() throws SAXException { |
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414 | boolean processedEvent; |
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415 | |
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416 | do { |
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417 | processedEvent = false; |
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418 | // check, if the next event can be processed |
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419 | if (eventBuffer.size() > 0) { |
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420 | BufferEntry entry = eventBuffer.get(0); |
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421 | |
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422 | if ((entry != null) && (entry.id != null) && (entry.parameters != null)) { |
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423 | processedEvent = handleEvent(entry.id, entry.parameters); |
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424 | if (processedEvent) { |
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425 | eventBuffer.remove(0); |
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426 | } |
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427 | } |
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428 | else { |
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429 | // the entry signals a session switch. Close the current session and start the |
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430 | // next one |
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431 | if (currentSequence.size() > 0) { |
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432 | sequences.add(currentSequence); |
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433 | currentSequence = new LinkedList<Event>(); |
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434 | } |
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435 | eventBuffer.remove(0); |
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436 | processedEvent = true; |
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437 | } |
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438 | } |
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439 | } |
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440 | while (processedEvent); |
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441 | } |
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442 | |
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443 | /** |
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444 | * <p> |
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445 | * This class is used internally for storing events and GUI elements in lists. |
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446 | * </p> |
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447 | */ |
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448 | private static class BufferEntry { |
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449 | |
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450 | /** */ |
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451 | private String id; |
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452 | |
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453 | /** */ |
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454 | private Map<String, String> parameters; |
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455 | |
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456 | /** |
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457 | * |
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458 | */ |
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459 | private BufferEntry(String id, Map<String, String> parameters) { |
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460 | this.id = id; |
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461 | this.parameters = parameters; |
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462 | } |
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463 | } |
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464 | |
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465 | } |
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