[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.LinkedList;
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| 18 | import java.util.List;
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| 19 |
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[545] | 20 | /**
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[831] | 21 | * <p>
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| 22 | * Skeletal implementation for GUI elements.
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| 23 | * </p>
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[545] | 24 | *
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[831] | 25 | * @version 1.0
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| 26 | * @author Patrick Harms
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[545] | 27 | */
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| 28 | public abstract class AbstractDefaultGUIElement implements IGUIElement {
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[831] | 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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[545] | 35 | public static final long serialVersionUID = 1L;
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| 36 |
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[831] | 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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[545] | 43 |
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[831] | 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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[1259] | 49 | private IGUIElement parent;
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[1010] | 50 |
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| 51 | /**
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| 52 | * <p>
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[1121] | 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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[1010] | 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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[1385] | 63 | private boolean usageObserved;
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[603] | 64 |
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[576] | 65 | /**
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| 66 | * <p>
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[1433] | 67 | * the reference to the GUI model to which this GUI element belongs.
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| 68 | * </p>
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| 69 | */
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| 70 | private GUIModel guiModel;
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| 71 |
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| 72 | /**
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| 73 | * <p>
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[831] | 74 | * Constructor. Creates a new AbstractDefaultGUIElement.
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[576] | 75 | * </p>
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[831] | 76 | *
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[576] | 77 | * @param specification
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[831] | 78 | * specification of the created GUI element
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| 79 | * @param parent
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| 80 | * parent of the created GUI element; null means the element is a top-level window
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[565] | 81 | */
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[603] | 82 | public AbstractDefaultGUIElement(IGUIElementSpec specification, IGUIElement parent) {
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[576] | 83 | this.specification = specification;
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[1010] | 84 | this.usageObserved = false;
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[1259] | 85 | setParent(parent);
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[565] | 86 | }
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| 87 |
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[545] | 88 | /*
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| 89 | * (non-Javadoc)
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| 90 | *
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[576] | 91 | * @see de.ugoe.cs.tasktree.guimodel.GUIElement#getSpecification()
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[545] | 92 | */
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| 93 | @Override
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[576] | 94 | public IGUIElementSpec getSpecification() {
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| 95 | return specification;
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[545] | 96 | }
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| 97 |
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[831] | 98 | /*
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| 99 | * (non-Javadoc)
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| 100 | *
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[922] | 101 | * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#getParent()
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[603] | 102 | */
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| 103 | @Override
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| 104 | public IGUIElement getParent() {
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| 105 | return parent;
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| 106 | }
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| 107 |
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[1433] | 108 | /* (non-Javadoc)
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| 109 | * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#getGUIModel()
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| 110 | */
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| 111 | @Override
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| 112 | public GUIModel getGUIModel() {
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| 113 | return guiModel;
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| 114 | }
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| 115 |
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[831] | 116 | /*
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| 117 | * (non-Javadoc)
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| 118 | *
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[922] | 119 | * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#addEqualGUIElement(IGUIElement)
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[609] | 120 | */
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| 121 | @Override
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[831] | 122 | public void addEqualGUIElement(IGUIElement equalElement) {
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[1121] | 123 | if (!(equalElement instanceof AbstractDefaultGUIElement)) {
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| 124 | throw new IllegalArgumentException
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| 125 | ("this implementation can only handle other AbstractDefaultGUIElements");
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| 126 | }
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| 127 |
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| 128 | AbstractDefaultGUIElement other = (AbstractDefaultGUIElement) equalElement;
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| 129 |
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| 130 | synchronized (AbstractDefaultGUIElement.class) {
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| 131 | if (this.equalGUIElements == null) {
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| 132 | if (other.equalGUIElements == null) {
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| 133 | this.equalGUIElements = new LinkedList<AbstractDefaultGUIElement>();
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| 134 | this.equalGUIElements.add(this);
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| 135 | this.equalGUIElements.add(other);
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| 136 | other.equalGUIElements = this.equalGUIElements;
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| 137 | }
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| 138 | else {
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| 139 | addIfNotContained(other.equalGUIElements, this);
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| 140 | this.equalGUIElements = other.equalGUIElements;
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| 141 | }
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| 142 | }
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| 143 | else {
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| 144 | if (other.equalGUIElements == null) {
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| 145 | addIfNotContained(this.equalGUIElements, other);
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| 146 | other.equalGUIElements = this.equalGUIElements;
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| 147 | }
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| 148 | else if (this.equalGUIElements != other.equalGUIElements) {
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| 149 | this.equalGUIElements.addAll(other.equalGUIElements);
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| 150 |
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| 151 | // we also have to set this new list for all other elements for which so
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| 152 | // far list2 was registered
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| 153 | for (AbstractDefaultGUIElement candidate : other.equalGUIElements) {
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| 154 | candidate.equalGUIElements = this.equalGUIElements;
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| 155 | }
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| 156 |
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| 157 | other.equalGUIElements = this.equalGUIElements;
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| 158 | }
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| 159 | // else
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| 160 | // in this case, both GUI elements should already be registered with the same
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| 161 | // lists.
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| 162 | }
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| 163 | }
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[609] | 164 | }
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| 165 |
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[545] | 166 | /*
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| 167 | * (non-Javadoc)
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| 168 | *
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[1051] | 169 | * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#isUsed()
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| 170 | */
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| 171 | @Override
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| 172 | public boolean isUsed() {
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| 173 | return usageObserved;
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| 174 | }
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| 175 |
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| 176 | /*
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| 177 | * (non-Javadoc)
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| 178 | *
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| 179 | * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#markUsed()
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| 180 | */
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| 181 | @Override
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| 182 | public void markUsed() {
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| 183 | this.usageObserved = true;
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| 184 | }
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| 185 |
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| 186 | /*
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| 187 | * (non-Javadoc)
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| 188 | *
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[576] | 189 | * @see GUIElement#equals(GUIElement)
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[545] | 190 | */
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[603] | 191 | public final boolean equals(Object other) {
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[609] | 192 | // implement final, as GUI elements are all singletons and they equal only if they are the
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| 193 | // same object or if they are in the list of equal GUI elements
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[1121] | 194 | if (super.equals(other)) {
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| 195 | return true;
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| 196 | }
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| 197 | else if (other instanceof AbstractDefaultGUIElement) {
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| 198 | synchronized (AbstractDefaultGUIElement.class) {
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| 199 | if (equalGUIElements != null) {
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| 200 | for (IGUIElement candidate : equalGUIElements) {
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| 201 | if (candidate == other) {
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| 202 | return true;
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| 203 | }
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| 204 | }
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| 205 | }
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| 206 | }
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| 207 | }
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| 208 |
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| 209 | return false;
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[545] | 210 | }
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| 211 |
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[831] | 212 | /*
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| 213 | * (non-Javadoc)
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| 214 | *
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[603] | 215 | * @see java.lang.Object#hashCode()
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| 216 | */
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| 217 | @Override
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| 218 | public final int hashCode() {
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[609] | 219 | // implement final, as GUI elements are all singletons and they equal only if they are the
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| 220 | // same object. If there are several GUI element objects that represent the same GUI element
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| 221 | // then they are stored in the list of equal elements. In this case, the hash code of the
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| 222 | // list is unique within the system
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[1121] | 223 | synchronized (AbstractDefaultGUIElement.class) {
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| 224 | if (this.equalGUIElements == null) {
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| 225 | this.equalGUIElements = new LinkedList<AbstractDefaultGUIElement>();
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| 226 | this.equalGUIElements.add(this);
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| 227 | }
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| 228 |
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| 229 | return System.identityHashCode(this.equalGUIElements);
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| 230 | }
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[603] | 231 | }
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[1010] | 232 |
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[609] | 233 | /**
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| 234 | * <p>
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[1259] | 235 | * updates the parent node of this node if required due to model restructuring
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| 236 | * </p>
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| 237 | */
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| 238 | void setParent(IGUIElement newParent) {
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[1385] | 239 | synchronized (AbstractDefaultGUIElement.class) {
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| 240 | // all equal GUI elements must have the same parent. Otherwise, they are not equal
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| 241 | // anymore and we would have discrepancies on the return value of getParent() on
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| 242 | // equal GUI elements.
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| 243 | this.parent = newParent;
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| 244 | if (equalGUIElements != null) {
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| 245 | for (AbstractDefaultGUIElement candidate : equalGUIElements) {
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| 246 | candidate.parent = newParent;
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| 247 | }
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| 248 | }
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| 249 | }
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[1433] | 250 | }
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[1385] | 251 |
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[1433] | 252 | /**
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| 253 | * <p>
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| 254 | * used to set the GUI model to which this GUI element belongs. Will be set automatically, if
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| 255 | * used in combination with {@link GUIModel};
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| 256 | * </p>
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| 257 | *
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| 258 | * @param guiModel
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| 259 | */
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| 260 | void setGUIModel(GUIModel guiModel) {
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| 261 | this.guiModel = guiModel;
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[1259] | 262 | }
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| 263 |
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| 264 | /**
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| 265 | * <p>
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[1121] | 266 | * Adds an {@link AbstractDefaultGUIElement} as equal to a list of
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| 267 | * {@link AbstractDefaultGUIElement}s if and only if it is not already contained.
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[609] | 268 | * </p>
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| 269 | *
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[1121] | 270 | * @param equalElementsList
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| 271 | * list of {@link AbstractDefaultGUIElement} to which the GUI element is added
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| 272 | * @param guiElement
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| 273 | * GUI element to be added
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[609] | 274 | */
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[1121] | 275 | private void addIfNotContained(List<AbstractDefaultGUIElement> equalElementsList,
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| 276 | AbstractDefaultGUIElement guiElement)
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| 277 | {
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| 278 | for (IGUIElement candidate : equalElementsList) {
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| 279 | if (candidate == guiElement) {
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| 280 | return;
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[609] | 281 | }
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| 282 | }
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| 283 |
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[1121] | 284 | equalElementsList.add(guiElement);
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[609] | 285 | }
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| 286 |
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[545] | 287 | }
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