[927] | 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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[831] | 14 |
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[922] | 15 | package de.ugoe.cs.autoquest.eventcore.guimodel;
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[545] | 16 |
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[609] | 17 | import java.util.IdentityHashMap;
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| 18 | import java.util.LinkedList;
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| 19 | import java.util.List;
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| 20 |
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[545] | 21 | /**
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[831] | 22 | * <p>
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| 23 | * Skeletal implementation for GUI elements.
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| 24 | * </p>
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[545] | 25 | *
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[831] | 26 | * @version 1.0
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| 27 | * @author Patrick Harms
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[545] | 28 | */
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| 29 | public abstract class AbstractDefaultGUIElement implements IGUIElement {
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[831] | 30 |
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| 31 | /**
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| 32 | * <p>
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| 33 | * Id for object serialization.
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| 34 | * </p>
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| 35 | */
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[545] | 36 | public static final long serialVersionUID = 1L;
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| 37 |
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[831] | 38 | /**
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| 39 | * <p>
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| 40 | * The reference to equal GUI element manager (needed to preserve singleton behavior, even
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| 41 | * though the objects are not singleton).
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| 42 | * </p>
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| 43 | */
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[609] | 44 | private static final EqualGUIElementManager equalGUIElementManager =
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| 45 | new EqualGUIElementManager();
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| 46 |
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[831] | 47 | /**
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| 48 | * <p>
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| 49 | * Specification of the GUI element
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| 50 | * </p>
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| 51 | */
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| 52 | private final IGUIElementSpec specification;
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[545] | 53 |
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[831] | 54 | /**
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| 55 | * <p>
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| 56 | * Reference to the parent element
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| 57 | * </p>
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| 58 | */
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| 59 | private final IGUIElement parent;
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[603] | 60 |
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[576] | 61 | /**
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| 62 | * <p>
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[831] | 63 | * Constructor. Creates a new AbstractDefaultGUIElement.
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[576] | 64 | * </p>
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[831] | 65 | *
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[576] | 66 | * @param specification
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[831] | 67 | * specification of the created GUI element
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| 68 | * @param parent
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| 69 | * parent of the created GUI element; null means the element is a top-level window
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[565] | 70 | */
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[603] | 71 | public AbstractDefaultGUIElement(IGUIElementSpec specification, IGUIElement parent) {
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[576] | 72 | this.specification = specification;
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[603] | 73 | this.parent = parent;
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[565] | 74 | }
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| 75 |
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[545] | 76 | /*
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| 77 | * (non-Javadoc)
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| 78 | *
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[576] | 79 | * @see de.ugoe.cs.tasktree.guimodel.GUIElement#getSpecification()
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[545] | 80 | */
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| 81 | @Override
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[576] | 82 | public IGUIElementSpec getSpecification() {
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| 83 | return specification;
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[545] | 84 | }
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| 85 |
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[831] | 86 | /*
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| 87 | * (non-Javadoc)
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| 88 | *
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[922] | 89 | * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#getParent()
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[603] | 90 | */
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| 91 | @Override
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| 92 | public IGUIElement getParent() {
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| 93 | return parent;
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| 94 | }
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| 95 |
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[831] | 96 | /*
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| 97 | * (non-Javadoc)
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| 98 | *
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[922] | 99 | * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#addEqualGUIElement(IGUIElement)
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[609] | 100 | */
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| 101 | @Override
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[831] | 102 | public void addEqualGUIElement(IGUIElement equalElement) {
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[609] | 103 | equalGUIElementManager.addEqualGUIElements(this, equalElement);
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| 104 | }
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| 105 |
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[545] | 106 | /*
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| 107 | * (non-Javadoc)
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| 108 | *
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[576] | 109 | * @see GUIElement#equals(GUIElement)
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[545] | 110 | */
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[603] | 111 | public final boolean equals(Object other) {
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[609] | 112 | // implement final, as GUI elements are all singletons and they equal only if they are the
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| 113 | // same object or if they are in the list of equal GUI elements
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| 114 | return super.equals(other) || equalGUIElementManager.equals(this, other);
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[545] | 115 | }
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| 116 |
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[831] | 117 | /*
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| 118 | * (non-Javadoc)
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| 119 | *
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[603] | 120 | * @see java.lang.Object#hashCode()
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| 121 | */
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| 122 | @Override
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| 123 | public final int hashCode() {
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[609] | 124 | // implement final, as GUI elements are all singletons and they equal only if they are the
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| 125 | // same object. If there are several GUI element objects that represent the same GUI element
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| 126 | // then they are stored in the list of equal elements. In this case, the hash code of the
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| 127 | // list is unique within the system
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| 128 | return equalGUIElementManager.hashCode(this);
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[603] | 129 | }
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| 130 |
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[609] | 131 | /**
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| 132 | * <p>
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[831] | 133 | * This internal helper class manages equal GUI elements. This is necessary, as we often first
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| 134 | * identify many GUI elements as different and later use a heuristic to determine that they are
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| 135 | * the same. This class provides the means to preserve the singleton behavior of the GUI
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| 136 | * elements after we merge two GUI elements.
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[609] | 137 | * </p>
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| 138 | *
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[831] | 139 | * @version 1.0
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| 140 | * @author Patrick Harms
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[609] | 141 | */
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| 142 | private static class EqualGUIElementManager {
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| 143 |
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| 144 | /**
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| 145 | * <p>
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[831] | 146 | * The internal map of GUI elements mapping each registered element to its equal variants.
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[609] | 147 | * We use the {@link IdentityHashMap} as a normal hash map would not work because of the
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| 148 | * changing of the hash code of GUI elements at runtime.
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| 149 | * </p>
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| 150 | */
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| 151 | private IdentityHashMap<IGUIElement, List<IGUIElement>> identityHashMap =
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| 152 | new IdentityHashMap<IGUIElement, List<IGUIElement>>();
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[831] | 153 |
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[609] | 154 | /**
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| 155 | * <p>
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[831] | 156 | * Adds a new equals relationship between two {@link IGUIElement}s to the equality manager.
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[609] | 157 | * </p>
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[831] | 158 | *
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| 159 | * @param guiElement1
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| 160 | * first equal GUI element
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| 161 | * @param guiElement2
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| 162 | * second equal GUI element
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[609] | 163 | */
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| 164 | private synchronized void addEqualGUIElements(IGUIElement guiElement1,
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| 165 | IGUIElement guiElement2)
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| 166 | {
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| 167 | List<IGUIElement> list1 = identityHashMap.get(guiElement1);
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| 168 | List<IGUIElement> list2 = identityHashMap.get(guiElement2);
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[831] | 169 |
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[609] | 170 | if (list1 == null) {
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| 171 | if (list2 == null) {
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| 172 | list2 = new LinkedList<IGUIElement>();
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| 173 | list2.add(guiElement1);
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| 174 | list2.add(guiElement2);
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| 175 | identityHashMap.put(guiElement1, list2);
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| 176 | identityHashMap.put(guiElement2, list2);
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| 177 | }
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| 178 | else {
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| 179 | addIfNotContained(list2, guiElement1);
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| 180 | identityHashMap.put(guiElement1, list2);
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| 181 | }
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| 182 | }
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| 183 | else {
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| 184 | if (list2 == null) {
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| 185 | addIfNotContained(list1, guiElement2);
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| 186 | identityHashMap.put(guiElement2, list1);
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| 187 | }
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| 188 | else if (list1 != list2) {
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| 189 | list1.addAll(list2);
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| 190 | identityHashMap.put(guiElement2, list1);
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| 191 | }
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| 192 | // else
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[831] | 193 | // in this case, both GUI elements should already be registered with the same
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| 194 | // lists.
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[609] | 195 | }
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| 196 | }
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| 197 |
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| 198 | /**
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| 199 | * <p>
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[831] | 200 | * Returns the object hash of a {@link IGUIElement}.
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[609] | 201 | * </p>
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[831] | 202 | *
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| 203 | * @param guiElement
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| 204 | * gui element whose object hash is determined
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| 205 | * @return the object hash
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[609] | 206 | */
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| 207 | private synchronized int hashCode(IGUIElement guiElement) {
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| 208 | return System.identityHashCode(getEqualElementsList(guiElement));
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| 209 | }
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| 210 |
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| 211 | /**
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| 212 | * <p>
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[831] | 213 | * Determines the equality of two {@link IGUIElement}s based on the information of the
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| 214 | * identify manager. Two elements are equal, if they have been added as equal using
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| 215 | * {@link #addEqualGUIElements(IGUIElement, IGUIElement)}.
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[609] | 216 | * </p>
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[831] | 217 | *
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| 218 | * @param guiElement
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| 219 | * GUI element to which the object is compared
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[609] | 220 | * @param other
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[831] | 221 | * object that is compared to the GUI element
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[609] | 222 | * @return
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| 223 | */
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| 224 | private synchronized boolean equals(IGUIElement guiElement, Object other) {
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| 225 | if (other instanceof IGUIElement) {
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| 226 | for (IGUIElement candidate : getEqualElementsList(guiElement)) {
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| 227 | if (candidate == other) {
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| 228 | return true;
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| 229 | }
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| 230 | }
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| 231 | }
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[831] | 232 |
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[609] | 233 | return false;
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| 234 | }
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| 235 |
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| 236 | /**
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| 237 | * <p>
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[831] | 238 | * Returns the equal {@link IGUIElement} of a given {@link IGUIElement}.
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[609] | 239 | * </p>
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[831] | 240 | *
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[609] | 241 | * @param guiElement
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[831] | 242 | * GUI element of which the equal elements are returned
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| 243 | * @return the equal GUI elements
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[609] | 244 | */
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| 245 | private List<IGUIElement> getEqualElementsList(IGUIElement guiElement) {
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| 246 | List<IGUIElement> returnValue = identityHashMap.get(guiElement);
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[831] | 247 |
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[609] | 248 | if (returnValue == null) {
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| 249 | returnValue = new LinkedList<IGUIElement>();
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| 250 | returnValue.add(guiElement);
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| 251 | identityHashMap.put(guiElement, returnValue);
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| 252 | }
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[831] | 253 |
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[609] | 254 | return returnValue;
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| 255 | }
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| 256 |
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| 257 | /**
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| 258 | * <p>
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[831] | 259 | * Adds {@link IGUIElement} as equal to a list of {@link IGUIElement} if and only if it is
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| 260 | * not already contained.
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[609] | 261 | * </p>
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[831] | 262 | *
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| 263 | * @param equalElementsList
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| 264 | * list of {@link IGUIElement} to which the GUI element is added
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| 265 | * @param guiElement
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| 266 | * GUI element to be added
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[609] | 267 | */
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| 268 | private void addIfNotContained(List<IGUIElement> equalElementsList, IGUIElement guiElement)
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| 269 | {
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| 270 | for (IGUIElement candidate : equalElementsList) {
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| 271 | if (candidate == guiElement) {
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| 272 | return;
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| 273 | }
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| 274 | }
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[831] | 275 |
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[609] | 276 | equalElementsList.add(guiElement);
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| 277 | }
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| 278 |
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| 279 | }
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| 280 |
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[545] | 281 | }
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