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.util.LinkedList;
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18 | import java.util.List;
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19 |
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20 | /**
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21 | * <p>
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22 | * Skeletal implementation for GUI elements.
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23 | * </p>
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24 | *
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25 | * @version 1.0
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26 | * @author Patrick Harms
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27 | */
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28 | public abstract class AbstractDefaultGUIElement implements IGUIElement {
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29 |
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30 | /**
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31 | * <p>
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32 | * Id for object serialization.
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33 | * </p>
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34 | */
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35 | public static final long serialVersionUID = 1L;
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36 |
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37 | /**
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38 | * <p>
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39 | * Specification of the GUI element
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40 | * </p>
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41 | */
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42 | private final IGUIElementSpec specification;
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43 |
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44 | /**
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45 | * <p>
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46 | * Reference to the parent element
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47 | * </p>
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48 | */
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49 | private IGUIElement parent;
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50 |
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51 | /**
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52 | * <p>
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53 | * List of other GUI elements being equal to this
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54 | * </p>
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55 | */
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56 | private List<AbstractDefaultGUIElement> equalGUIElements = null;
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57 |
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58 | /**
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59 | * <p>
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60 | * Boolean that indicates if a GUIElement was used during a session.
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61 | * </p>
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62 | */
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63 | boolean usageObserved;
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64 |
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65 | /**
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66 | * <p>
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67 | * Constructor. Creates a new AbstractDefaultGUIElement.
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68 | * </p>
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69 | *
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70 | * @param specification
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71 | * specification of the created GUI element
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72 | * @param parent
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73 | * parent of the created GUI element; null means the element is a top-level window
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74 | */
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75 | public AbstractDefaultGUIElement(IGUIElementSpec specification, IGUIElement parent) {
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76 | this.specification = specification;
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77 | this.usageObserved = false;
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78 | setParent(parent);
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79 | }
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80 |
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81 | /*
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82 | * (non-Javadoc)
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83 | *
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84 | * @see de.ugoe.cs.tasktree.guimodel.GUIElement#getSpecification()
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85 | */
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86 | @Override
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87 | public IGUIElementSpec getSpecification() {
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88 | return specification;
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89 | }
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90 |
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91 | /*
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92 | * (non-Javadoc)
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93 | *
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94 | * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#getParent()
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95 | */
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96 | @Override
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97 | public IGUIElement getParent() {
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98 | return parent;
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99 | }
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100 |
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101 | /*
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102 | * (non-Javadoc)
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103 | *
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104 | * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#addEqualGUIElement(IGUIElement)
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105 | */
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106 | @Override
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107 | public void addEqualGUIElement(IGUIElement equalElement) {
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108 | if (!(equalElement instanceof AbstractDefaultGUIElement)) {
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109 | throw new IllegalArgumentException
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110 | ("this implementation can only handle other AbstractDefaultGUIElements");
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111 | }
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112 |
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113 | AbstractDefaultGUIElement other = (AbstractDefaultGUIElement) equalElement;
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114 |
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115 | synchronized (AbstractDefaultGUIElement.class) {
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116 | if (this.equalGUIElements == null) {
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117 | if (other.equalGUIElements == null) {
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118 | this.equalGUIElements = new LinkedList<AbstractDefaultGUIElement>();
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119 | this.equalGUIElements.add(this);
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120 | this.equalGUIElements.add(other);
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121 | other.equalGUIElements = this.equalGUIElements;
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122 | }
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123 | else {
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124 | addIfNotContained(other.equalGUIElements, this);
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125 | this.equalGUIElements = other.equalGUIElements;
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126 | }
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127 | }
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128 | else {
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129 | if (other.equalGUIElements == null) {
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130 | addIfNotContained(this.equalGUIElements, other);
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131 | other.equalGUIElements = this.equalGUIElements;
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132 | }
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133 | else if (this.equalGUIElements != other.equalGUIElements) {
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134 | this.equalGUIElements.addAll(other.equalGUIElements);
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135 |
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136 | // we also have to set this new list for all other elements for which so
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137 | // far list2 was registered
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138 | for (AbstractDefaultGUIElement candidate : other.equalGUIElements) {
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139 | candidate.equalGUIElements = this.equalGUIElements;
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140 | }
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141 |
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142 | other.equalGUIElements = this.equalGUIElements;
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143 | }
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144 | // else
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145 | // in this case, both GUI elements should already be registered with the same
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146 | // lists.
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147 | }
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148 | }
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149 | }
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150 |
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151 | /*
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152 | * (non-Javadoc)
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153 | *
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154 | * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#isUsed()
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155 | */
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156 | @Override
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157 | public boolean isUsed() {
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158 | return usageObserved;
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159 | }
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160 |
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161 | /*
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162 | * (non-Javadoc)
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163 | *
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164 | * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#markUsed()
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165 | */
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166 | @Override
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167 | public void markUsed() {
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168 | this.usageObserved = true;
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169 | }
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170 |
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171 | /*
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172 | * (non-Javadoc)
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173 | *
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174 | * @see GUIElement#equals(GUIElement)
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175 | */
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176 | public final boolean equals(Object other) {
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177 | // implement final, as GUI elements are all singletons and they equal only if they are the
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178 | // same object or if they are in the list of equal GUI elements
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179 | if (super.equals(other)) {
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180 | return true;
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181 | }
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182 | else if (other instanceof AbstractDefaultGUIElement) {
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183 | synchronized (AbstractDefaultGUIElement.class) {
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184 | if (equalGUIElements != null) {
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185 | for (IGUIElement candidate : equalGUIElements) {
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186 | if (candidate == other) {
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187 | return true;
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188 | }
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189 | }
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190 | }
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191 | }
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192 | }
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193 |
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194 | return false;
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195 | }
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196 |
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197 | /*
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198 | * (non-Javadoc)
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199 | *
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200 | * @see java.lang.Object#hashCode()
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201 | */
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202 | @Override
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203 | public final int hashCode() {
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204 | // implement final, as GUI elements are all singletons and they equal only if they are the
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205 | // same object. If there are several GUI element objects that represent the same GUI element
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206 | // then they are stored in the list of equal elements. In this case, the hash code of the
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207 | // list is unique within the system
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208 | synchronized (AbstractDefaultGUIElement.class) {
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209 | if (this.equalGUIElements == null) {
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210 | this.equalGUIElements = new LinkedList<AbstractDefaultGUIElement>();
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211 | this.equalGUIElements.add(this);
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212 | }
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213 |
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214 | return System.identityHashCode(this.equalGUIElements);
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215 | }
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216 | }
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217 |
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218 | /**
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219 | * <p>
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220 | * updates the parent node of this node if required due to model restructuring
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221 | * </p>
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222 | */
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223 | void setParent(IGUIElement newParent) {
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224 | this.parent = newParent;
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225 | }
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226 |
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227 | /**
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228 | * <p>
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229 | * Adds an {@link AbstractDefaultGUIElement} as equal to a list of
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230 | * {@link AbstractDefaultGUIElement}s if and only if it is not already contained.
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231 | * </p>
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232 | *
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233 | * @param equalElementsList
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234 | * list of {@link AbstractDefaultGUIElement} to which the GUI element is added
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235 | * @param guiElement
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236 | * GUI element to be added
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237 | */
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238 | private void addIfNotContained(List<AbstractDefaultGUIElement> equalElementsList,
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239 | AbstractDefaultGUIElement guiElement)
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240 | {
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241 | for (IGUIElement candidate : equalElementsList) {
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242 | if (candidate == guiElement) {
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243 | return;
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244 | }
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245 | }
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246 |
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247 | equalElementsList.add(guiElement);
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248 | }
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249 |
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250 | }
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