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.eventcore.guimodel; |
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16 | |
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17 | import java.io.OutputStream; |
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18 | import java.io.PrintStream; |
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19 | import java.io.UnsupportedEncodingException; |
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20 | import java.util.ArrayList; |
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21 | import java.util.LinkedList; |
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22 | import java.util.List; |
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23 | import java.util.logging.Level; |
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24 | |
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25 | import de.ugoe.cs.util.console.Console; |
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26 | |
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27 | /** |
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28 | * <p> |
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29 | * A GUI model is a tree of {@link IGUIElements} and represents a complete GUI of a software. It is |
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30 | * platform independent. It may have several root nodes, as some GUIs are made up of several Frames |
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31 | * being independent from each other. The GUI model is filled using the |
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32 | * {@link #integratePath(List, IGUIElementFactory)} method. |
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33 | * </p> |
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34 | * |
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35 | * @version 1.0 |
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36 | * @author Patrick Harms, Steffen Herbold |
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37 | */ |
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38 | public class GUIModel { |
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39 | |
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40 | /** |
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41 | * <p> |
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42 | * The root node of the tree not provided externally. |
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43 | * </p> |
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44 | */ |
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45 | private TreeNode root = new TreeNode(); |
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46 | |
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47 | /** |
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48 | * <p> |
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49 | * A list with all nodes currently known |
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50 | * </p> |
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51 | */ |
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52 | private List<TreeNode> allNodes = new ArrayList<TreeNode>(); |
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53 | |
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54 | /** |
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55 | * <p> |
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56 | * Integrates a path of GUI elements into the GUI model. The GUI model itself is a tree and |
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57 | * therefore a set of different paths through the tree that start with a root node and end with |
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58 | * a leaf node. Such a path can be added to the tree. The method checks, if any of the GUI |
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59 | * elements denoted by the path already exists. If so, it reuses it. It may therefore also |
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60 | * return an existing GUI element being the leaf node of the provided path. If a GUI element of |
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61 | * the path does not exist yet, it creates a new one using the provided GUI element factory. |
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62 | * </p> |
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63 | * <p> |
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64 | * If a GUI element specification describes an existing GUI element or not is determined through |
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65 | * comparing the GUI element specifications of the existing GUI elements with the ones provided |
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66 | * in the path. The comparison is done using the |
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67 | * {@link IGUIElementSpec#getSimilarity(IGUIElementSpec)} method. The comparison is only done on |
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68 | * the correct levels. I.e. the currently known root elements of the tree are only compared to |
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69 | * the first element in the path. If the correct one is found or created, its children are |
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70 | * compared only to the second specification in the path, and so on. |
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71 | * </p> |
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72 | * <p> |
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73 | * The returned GUI elements are singletons. I.e. it is tried to return always the identical |
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74 | * object for the same denoted element. However, while creating the GUI model, the similarity of |
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75 | * GUI elements may change. Therefore, the method might determine, that two formerly different |
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76 | * nodes are now similar. (This may happen, e.g. if GUI elements do not have initial names which |
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77 | * are set afterwards. Therefore, first they are handled differently and later they can be |
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78 | * identified as being the same.) In such a case, there are already several GUI element objects |
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79 | * instantiated for the same GUI element. The singleton paradigm gets broken. Therefore, such |
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80 | * GUI element objects are registered with each other, so that their equal method can determine |
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81 | * equality again correctly, although the objects are no singletons anymore. |
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82 | * </p> |
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83 | * |
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84 | * @param guiElementPath |
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85 | * the path to integrate into the model |
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86 | * @param guiElementFactory |
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87 | * the GUI element factory to be used for instantiating GUI element objects |
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88 | * |
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89 | * @return The GUI element object representing the GUI element denoted by the provided path |
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90 | * |
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91 | * @throws GUIModelException |
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92 | * thrown in cases such as the GUI element object could not be instantiated |
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93 | * @throws IllegalArgumentException |
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94 | * if the provided path is invalid. |
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95 | */ |
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96 | public IGUIElement integratePath(List<? extends IGUIElementSpec> guiElementPath, |
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97 | IGUIElementFactory guiElementFactory) |
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98 | throws GUIModelException, IllegalArgumentException |
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99 | { |
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100 | if ((guiElementPath == null) || (guiElementPath.size() <= 0)) { |
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101 | throw new IllegalArgumentException("GUI element path must contain at least one element"); |
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102 | } |
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103 | |
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104 | List<IGUIElementSpec> remainingPath = new LinkedList<IGUIElementSpec>(); |
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105 | |
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106 | for (IGUIElementSpec spec : guiElementPath) { |
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107 | remainingPath.add(spec); |
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108 | } |
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109 | |
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110 | return integratePath(root, remainingPath, guiElementFactory); |
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111 | } |
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112 | |
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113 | /** |
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114 | * <p> |
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115 | * Returns all children of the provided GUI element or null, if it does not have any or the node |
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116 | * is unknown. |
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117 | * </p> |
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118 | * |
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119 | * @param guiElement |
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120 | * the GUI element of which the children shall be returned |
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121 | * |
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122 | * @return As described |
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123 | */ |
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124 | public List<IGUIElement> getChildren(IGUIElement guiElement) { |
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125 | List<IGUIElement> result = null; |
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126 | for (TreeNode node : allNodes) { |
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127 | if (node.guiElement.equals(guiElement)) { |
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128 | if (result == null) { |
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129 | result = new ArrayList<IGUIElement>(); |
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130 | |
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131 | if (node.children != null) { |
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132 | for (TreeNode child : node.children) { |
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133 | result.add(child.guiElement); |
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134 | } |
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135 | } |
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136 | } |
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137 | else { |
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138 | Console |
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139 | .traceln(Level.SEVERE, |
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140 | "Multiple nodes in the internal GUI model match the same GUI element. " |
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141 | + "This should not be the case and the GUI model is probably invalid."); |
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142 | } |
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143 | } |
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144 | } |
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145 | |
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146 | return result; |
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147 | } |
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148 | |
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149 | /** |
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150 | * <p> |
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151 | * Returns the parent GUI element of the provided GUI element or null, if it does not have a |
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152 | * parent (i.e. if it is a root node) or if the node is unknown. |
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153 | * </p> |
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154 | * |
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155 | * @param guiElement |
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156 | * the GUI element of which the parent shall be returned |
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157 | * |
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158 | * @return As described |
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159 | */ |
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160 | public IGUIElement getParent(IGUIElement guiElement) { |
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161 | IGUIElement parent = null; |
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162 | |
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163 | for (TreeNode node : allNodes) { |
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164 | for (TreeNode child : node.children) { |
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165 | if (child.guiElement.equals(guiElement)) { |
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166 | if (parent != null) { |
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167 | parent = node.guiElement; |
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168 | } |
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169 | else { |
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170 | Console |
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171 | .traceln(Level.SEVERE, |
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172 | "Multiple nodes in the internal GUI model match the same GUI element. " |
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173 | + "This should not be the case and the GUI model is probably invalid."); |
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174 | } |
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175 | } |
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176 | } |
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177 | } |
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178 | |
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179 | return parent; |
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180 | } |
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181 | |
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182 | /** |
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183 | * <p> |
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184 | * Returns all root GUI elements of the model or an empty list, if the model is empty |
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185 | * </p> |
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186 | * |
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187 | * @return As described |
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188 | */ |
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189 | public List<IGUIElement> getRootElements() { |
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190 | List<IGUIElement> roots = new ArrayList<IGUIElement>(); |
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191 | |
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192 | if (root.children != null) { |
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193 | for (TreeNode rootChild : root.children) { |
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194 | roots.add(rootChild.guiElement); |
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195 | } |
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196 | } |
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197 | |
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198 | return roots; |
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199 | } |
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200 | |
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201 | /** |
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202 | * <p> |
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203 | * dumps the GUI model to the provided stream. Each node is represented through its toString() |
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204 | * method. If a node has children, those are dumped indented and surrounded by braces. |
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205 | * </p> |
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206 | * |
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207 | * @param out |
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208 | * The stream to dump the textual representation of the model to |
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209 | * @param encoding |
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210 | * The encoding to be used while dumping |
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211 | */ |
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212 | public void dump(OutputStream out, String encoding) { |
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213 | PrintStream stream; |
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214 | |
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215 | if (out instanceof PrintStream) { |
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216 | stream = (PrintStream) out; |
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217 | } |
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218 | else { |
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219 | String enc = encoding == null ? "UTF-8" : encoding; |
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220 | try { |
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221 | stream = new PrintStream(out, true, enc); |
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222 | } |
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223 | catch (UnsupportedEncodingException e) { |
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224 | throw new IllegalArgumentException("encodind " + enc + " not supported"); |
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225 | } |
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226 | } |
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227 | |
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228 | for (IGUIElement root : getRootElements()) { |
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229 | dumpGUIElement(stream, root, ""); |
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230 | } |
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231 | } |
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232 | |
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233 | /** |
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234 | * <p> |
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235 | * By calling this method, the GUIModel is traversed and similar nodes are merged. |
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236 | * </p> |
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237 | * |
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238 | */ |
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239 | public void condenseModel() { |
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240 | mergeSubTree(root); |
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241 | } |
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242 | |
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243 | /** |
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244 | * <p> |
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245 | * Merges the tree nodes of two GUI elements. The GUI elements need to have the same parent. |
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246 | * </p> |
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247 | * |
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248 | * @param guiElement1 |
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249 | * the first merge GUI element |
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250 | * @param guiElement2 |
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251 | * the second merge GUI element |
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252 | * @throws IllegalArgumentException |
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253 | * thrown if the two GUI elements do not have the same parent |
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254 | */ |
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255 | public void mergeGUIElements(IGUIElement guiElement1, IGUIElement guiElement2) |
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256 | throws IllegalArgumentException |
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257 | { |
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258 | // check if both nodes have the same parent |
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259 | IGUIElement parentElement = guiElement1.getParent(); |
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260 | if (parentElement != null && !parentElement.equals(guiElement2.getParent())) { |
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261 | throw new IllegalArgumentException("can only merge nodes with the same parent"); |
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262 | } |
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263 | |
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264 | // get the TreeNode of the parent of the GUI elements |
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265 | TreeNode parent = findNode(parentElement); |
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266 | |
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267 | // get the TreeNodes for both GUI elements |
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268 | TreeNode node1 = findNode(guiElement1); |
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269 | TreeNode node2 = findNode(guiElement2); |
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270 | |
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271 | if (node1 == null || node2 == null) { |
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272 | throw new IllegalArgumentException( |
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273 | "Error while merging nodes: one element is not part of the GUI model!"); |
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274 | } |
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275 | |
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276 | TreeNode replacement = mergeTreeNodes(node1, node2); |
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277 | |
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278 | if (parent != null) { |
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279 | // remove node1 and node2 from the parent's children and add the replacement instead |
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280 | // assumes that there are no duplicates of node1 and node2 |
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281 | if (parent.children != null) { |
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282 | parent.children.set(parent.children.indexOf(node1), replacement); |
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283 | parent.children.remove(node2); |
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284 | } |
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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 | * <p> |
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291 | * internally integrates a path as the children of the provided parent node. This method is |
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292 | * recursive and calls itself, for the child of the parent node, that matches the first element |
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293 | * in the remaining path. |
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294 | * </p> |
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295 | * |
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296 | * @param parentNode |
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297 | * the parent node to add children for |
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298 | * @param guiElementPath |
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299 | * the path of children to be created starting with the parent node |
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300 | * @param guiElementFactory |
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301 | * the GUI element factory to be used for instantiating GUI element objects |
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302 | * |
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303 | * @return The GUI element object representing the GUI element denoted by the provided path |
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304 | * |
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305 | * @throws GUIModelException |
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306 | * thrown in cases such as the GUI element object could not be instantiated |
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307 | */ |
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308 | private IGUIElement integratePath(TreeNode parentNode, |
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309 | List<? extends IGUIElementSpec> remainingPath, |
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310 | IGUIElementFactory guiElementFactory) |
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311 | throws GUIModelException |
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312 | { |
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313 | IGUIElementSpec specToIntegrateElementFor = remainingPath.remove(0); |
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314 | |
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315 | TreeNode child = findEqualChild(parentNode, specToIntegrateElementFor); |
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316 | if (child == null) { |
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317 | IGUIElement newElement = |
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318 | guiElementFactory.instantiateGUIElement(specToIntegrateElementFor, |
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319 | parentNode.guiElement); |
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320 | |
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321 | child = parentNode.addChild(newElement); |
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322 | } |
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323 | |
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324 | if (remainingPath.size() > 0) { |
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325 | return integratePath(child, remainingPath, guiElementFactory); |
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326 | } |
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327 | else { |
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328 | return child.guiElement; |
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329 | } |
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330 | } |
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331 | |
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332 | /** |
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333 | * <p> |
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334 | * Searches the children of a tree node to see if the {@link IGUIElementSpec} of equals the |
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335 | * specification of the {@link TreeNode#guiElement} of the child. If a match is found, the child |
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336 | * is returned. |
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337 | * </p> |
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338 | * |
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339 | * @param parentNode |
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340 | * parent node whose children are searched |
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341 | * @param specToMatch |
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342 | * specification that is searched for |
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343 | * @return matching child node or null if no child matches |
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344 | */ |
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345 | private TreeNode findEqualChild(TreeNode parentNode, IGUIElementSpec specToMatch) { |
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346 | if (parentNode.children != null) { |
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347 | for (TreeNode child : parentNode.children) { |
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348 | if (specToMatch.equals(child.guiElement.getSpecification())) { |
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349 | return child; |
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350 | } |
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351 | } |
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352 | } |
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353 | return null; |
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354 | } |
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355 | |
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356 | /** |
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357 | * <p> |
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358 | * Merges all similar nodes in the sub-tree of the GUI model defined by the subTreeRoot. |
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359 | * </p> |
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360 | * <p> |
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361 | * The merging order is a bottom-up. This means, that we first call mergeSubTree recursively for |
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362 | * the grand children of the subTreeRoot, before we merge subTreeRoot. |
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363 | * </p> |
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364 | * <p> |
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365 | * The merging strategy is top-down. This means, that every time we merge two child nodes, we |
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366 | * call mergeSubTree recursively for all children of the merged nodes in order to check if we |
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367 | * can merge the children, too. |
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368 | * </p> |
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369 | * |
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370 | * @param subTreeRoot |
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371 | * root node of the sub-tree that is merged |
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372 | */ |
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373 | private void mergeSubTree(TreeNode subTreeRoot) { |
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374 | if (subTreeRoot.children == null || subTreeRoot.children.isEmpty()) { |
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375 | return; |
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376 | } |
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377 | |
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378 | // lets first merge the grand children of the parentNode |
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379 | for (TreeNode child : subTreeRoot.children) { |
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380 | mergeSubTree(child); |
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381 | } |
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382 | |
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383 | boolean performedMerge; |
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384 | |
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385 | do { |
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386 | performedMerge = false; |
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387 | for (int i = 0; !performedMerge && i < subTreeRoot.children.size(); i++) { |
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388 | IGUIElementSpec elemSpec1 = |
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389 | subTreeRoot.children.get(i).guiElement.getSpecification(); |
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390 | for (int j = i + 1; !performedMerge && j < subTreeRoot.children.size(); j++) { |
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391 | IGUIElementSpec elemSpec2 = |
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392 | subTreeRoot.children.get(j).guiElement.getSpecification(); |
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393 | if (elemSpec1.getSimilarity(elemSpec2)) { |
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394 | TreeNode replacement = |
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395 | mergeTreeNodes(subTreeRoot.children.get(i), subTreeRoot.children.get(j)); |
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396 | |
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397 | subTreeRoot.children.set(i, replacement); |
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398 | subTreeRoot.children.remove(j); |
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399 | performedMerge = true; |
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400 | i--; |
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401 | break; |
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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 | while (performedMerge); |
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407 | } |
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408 | |
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409 | /** |
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410 | * <p> |
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411 | * merges two nodes with each other. Merging means registering the GUI element objects with each |
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412 | * other for equality checks. Further it add all children of both nodes to a new replacing node. |
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413 | * Afterwards, all similar nodes of the replacement node are merged as well. |
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414 | * </p> |
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415 | * |
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416 | * @param treeNode1 |
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417 | * the first of the two nodes to be merged |
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418 | * @param treeNode2 |
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419 | * the second of the two nodes to be merged |
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420 | * @return a tree node being the merge of the two provided nodes. |
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421 | */ |
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422 | private TreeNode mergeTreeNodes(TreeNode treeNode1, TreeNode treeNode2) { |
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423 | // the following two lines are needed to preserve the references to the existing GUI |
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424 | // elements. If two elements are the same, one should be deleted to make the elements |
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425 | // singletons again. However, there may exist references to both objects. To preserve |
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426 | // these, we simply register the equal GUI elements with each other so that an equals |
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427 | // check can return true. |
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428 | treeNode1.guiElement.addEqualGUIElement(treeNode2.guiElement); |
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429 | treeNode2.guiElement.addEqualGUIElement(treeNode1.guiElement); |
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430 | |
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431 | // and now a replacement node that is the merge of treeNode1 and treeNode2 is created |
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432 | TreeNode replacement = new TreeNode(); |
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433 | replacement.guiElement = treeNode1.guiElement; |
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434 | if (treeNode1.children != null) { |
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435 | for (TreeNode child : treeNode1.children) { |
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436 | replacement.addChildNode(child); |
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437 | } |
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438 | } |
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439 | if (treeNode2.children != null) { |
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440 | for (TreeNode child : treeNode2.children) { |
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441 | replacement.addChildNode(child); |
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442 | } |
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443 | } |
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444 | |
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445 | mergeSubTree(replacement); |
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446 | |
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447 | replacement.guiElement.updateSpecification(treeNode2.guiElement.getSpecification()); |
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448 | |
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449 | // finally, update the known nodes list |
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450 | // if you don't do this getChildren will return wrong things and very bad things happen! |
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451 | allNodes.remove(treeNode1); |
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452 | allNodes.remove(treeNode2); |
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453 | allNodes.add(replacement); |
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454 | |
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455 | return replacement; |
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456 | } |
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457 | |
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458 | /** |
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459 | * <p> |
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460 | * dumps a GUI element to the stream. A dump contains the toString() representation of the GUI |
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461 | * element as well as a indented list of its children surrounded by braces. |
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462 | * </p> |
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463 | * |
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464 | * @param out |
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465 | * {@link PrintStream} where the guiElement is dumped to |
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466 | * @param guiElement |
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467 | * the guiElement whos string represenation is dumped |
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468 | * @param indent |
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469 | * indent string of the dumping |
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470 | */ |
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471 | private void dumpGUIElement(PrintStream out, IGUIElement guiElement, String indent) { |
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472 | out.print(indent); |
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473 | out.print(guiElement); |
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474 | |
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475 | List<IGUIElement> children = getChildren(guiElement); |
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476 | |
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477 | if ((children != null) && (children.size() > 0)) { |
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478 | out.println(" {"); |
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479 | |
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480 | for (IGUIElement child : children) { |
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481 | dumpGUIElement(out, child, indent + " "); |
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482 | } |
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483 | |
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484 | out.print(indent); |
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485 | out.print("}"); |
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486 | } |
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487 | |
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488 | out.println(); |
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489 | } |
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490 | |
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491 | /** |
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492 | * <p> |
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493 | * Retrieves the TreeNode associated with a GUI element. Returns null if no such TreeNode is |
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494 | * found. |
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495 | * </p> |
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496 | * |
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497 | * @param element |
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498 | * the GUI element |
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499 | * @return associated TreeNode; null if no such node exists |
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500 | */ |
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501 | private TreeNode findNode(IGUIElement element) { |
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502 | if (element == null) { |
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503 | return null; |
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504 | } |
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505 | |
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506 | TreeNode result = null; |
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507 | for (TreeNode node : allNodes) { |
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508 | if (node.guiElement.equals(element)) { |
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509 | if (result == null) { |
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510 | result = node; |
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511 | } |
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512 | else { |
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513 | Console |
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514 | .traceln(Level.SEVERE, |
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515 | "Multiple nodes in the internal GUI model match the same GUI element. " |
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516 | + "This should not be the case and the GUI model is probably invalid."); |
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517 | } |
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518 | } |
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519 | } |
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520 | return result; |
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521 | } |
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522 | |
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523 | /** |
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524 | * <p> |
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525 | * Used internally for building up the tree of GUI elements. |
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526 | * </p> |
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527 | * |
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528 | * @version 1.0 |
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529 | * @author Patrick Harms, Steffen Herbold |
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530 | */ |
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531 | private class TreeNode { |
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532 | |
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533 | /** |
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534 | * <p> |
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535 | * GUI element associated with the TreeNode. |
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536 | * </p> |
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537 | */ |
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538 | private IGUIElement guiElement; |
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539 | |
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540 | /** |
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541 | * <p> |
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542 | * Children of the TreeNode. |
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543 | * </p> |
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544 | */ |
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545 | private List<TreeNode> children; |
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546 | |
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547 | /** |
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548 | * <p> |
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549 | * Adds a child to the current node while keeping all lists of nodes up to date |
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550 | * </p> |
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551 | * |
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552 | * @param guiElement |
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553 | * GUI element that will be associated with the new child |
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554 | * @return the added child |
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555 | */ |
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556 | private TreeNode addChild(IGUIElement guiElement) { |
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557 | if (children == null) { |
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558 | children = new ArrayList<TreeNode>(); |
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559 | } |
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560 | |
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561 | TreeNode child = new TreeNode(); |
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562 | child.guiElement = guiElement; |
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563 | children.add(child); |
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564 | |
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565 | allNodes.add(child); |
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566 | |
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567 | return child; |
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568 | } |
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569 | |
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570 | /** |
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571 | * |
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572 | * <p> |
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573 | * Adds a TreeNode as child to the current node. This way, the whole sub-tree is added. |
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574 | * </p> |
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575 | * |
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576 | * @param node |
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577 | * child node that is added |
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578 | * @return node that has been added |
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579 | */ |
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580 | private TreeNode addChildNode(TreeNode node) { |
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581 | if (children == null) { |
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582 | children = new ArrayList<TreeNode>(); |
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583 | } |
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584 | children.add(node); |
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585 | return node; |
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586 | } |
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587 | |
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588 | /* |
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589 | * (non-Javadoc) |
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590 | * |
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591 | * @see java.lang.Object#toString() |
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592 | */ |
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593 | @Override |
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594 | public String toString() { |
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595 | return guiElement.toString(); |
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596 | } |
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597 | } |
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598 | } |
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