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annotate org.eclipse.core.databinding/src/org/eclipse/core/databinding/observable/map/ComputedObservableMap.d @ 94:1d37a7813832
First Databinding Snippet (004) builds
| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Sun, 19 Apr 2009 17:37:36 +0200 |
| parents | 6be48cf9f95c |
| children | 5d5bd660917f |
| rev | line source |
|---|---|
| 78 | 1 /******************************************************************************* |
| 2 * Copyright (c) 2006, 2007 IBM Corporation and others. | |
| 3 * All rights reserved. This program and the accompanying materials | |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 10 *******************************************************************************/ | |
| 11 | |
| 12 module org.eclipse.core.databinding.observable.map.ComputedObservableMap; | |
| 81 | 13 import org.eclipse.core.databinding.observable.map.AbstractObservableMap; |
| 78 | 14 |
| 15 import java.lang.all; | |
| 16 | |
| 17 import java.util.AbstractSet; | |
| 18 import java.util.Collections; | |
| 19 import java.util.HashMap; | |
| 20 import java.util.HashSet; | |
| 21 import java.util.Iterator; | |
| 22 import java.util.Map; | |
| 23 import java.util.Set; | |
| 24 | |
| 25 import org.eclipse.core.databinding.observable.Diffs; | |
| 26 import org.eclipse.core.databinding.observable.set.IObservableSet; | |
| 27 import org.eclipse.core.databinding.observable.set.ISetChangeListener; | |
| 28 import org.eclipse.core.databinding.observable.set.SetChangeEvent; | |
| 29 | |
| 30 /** | |
| 31 * Maps objects to one of their attributes. Tracks changes to the underlying | |
| 32 * observable set of objects (keys), as well as changes to attribute values. | |
| 33 */ | |
| 34 public abstract class ComputedObservableMap : AbstractObservableMap { | |
| 35 | |
| 85 | 36 private final IObservableSet fkeySet; |
| 78 | 37 |
| 85 | 38 private ISetChangeListener setChangeListener; |
| 39 class SetChangeListener : ISetChangeListener { | |
| 78 | 40 public void handleSetChange(SetChangeEvent event) { |
| 41 Set addedKeys = new HashSet(event.diff.getAdditions()); | |
| 42 Set removedKeys = new HashSet(event.diff.getRemovals()); | |
| 43 Map oldValues = new HashMap(); | |
| 44 Map newValues = new HashMap(); | |
| 45 for (Iterator it = removedKeys.iterator(); it.hasNext();) { | |
| 46 Object removedKey = it.next(); | |
| 47 Object oldValue = doGet(removedKey); | |
| 48 unhookListener(removedKey); | |
| 49 if (oldValue !is null) { | |
| 50 oldValues.put(removedKey, oldValue); | |
| 51 } | |
| 52 } | |
| 53 for (Iterator it = addedKeys.iterator(); it.hasNext();) { | |
| 54 Object addedKey = it.next(); | |
| 55 hookListener(addedKey); | |
| 56 Object newValue = doGet(addedKey); | |
| 57 newValues.put(addedKey, newValue); | |
| 58 } | |
| 59 fireMapChange(Diffs.createMapDiff(addedKeys, removedKeys, | |
| 60 Collections.EMPTY_SET, oldValues, newValues)); | |
| 61 } | |
| 62 }; | |
| 63 | |
| 85 | 64 private Set fentrySet; |
| 78 | 65 |
| 66 private class EntrySet : AbstractSet { | |
|
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parents:
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changeset
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67 public int opApply (int delegate(ref Object value) dg){ |
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1d37a7813832
First Databinding Snippet (004) builds
Frank Benoit <benoit@tionex.de>
parents:
85
diff
changeset
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68 return super.opApply(dg); |
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1d37a7813832
First Databinding Snippet (004) builds
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parents:
85
diff
changeset
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69 } |
| 78 | 70 |
| 71 public Iterator iterator() { | |
| 72 return new class() Iterator { | |
| 73 | |
| 74 final Iterator keyIterator; | |
| 75 this(){ | |
| 85 | 76 keyIterator = fkeySet.iterator(); |
| 78 | 77 } |
| 78 | |
| 79 public bool hasNext() { | |
| 80 return keyIterator.hasNext(); | |
| 81 } | |
| 82 | |
| 83 public Object next() { | |
| 84 return new class() Map.Entry { | |
| 85 Object key; | |
| 86 this(){ | |
| 87 key = keyIterator.next(); | |
| 88 } | |
| 89 | |
| 90 public Object getKey() { | |
| 91 return key; | |
| 92 } | |
| 93 | |
| 94 public Object getValue() { | |
| 95 return get(getKey()); | |
| 96 } | |
| 97 | |
| 98 public Object setValue(Object value) { | |
| 99 return put(getKey(), value); | |
| 100 } | |
| 85 | 101 |
| 102 public override equals_t opEquals(Object o){ | |
| 103 implMissing( __FILE__, __LINE__ ); | |
| 104 return 0; | |
| 105 } | |
| 106 public override hash_t toHash(){ | |
| 107 implMissing( __FILE__, __LINE__ ); | |
| 108 return 0; | |
| 109 } | |
| 110 | |
| 78 | 111 }; |
| 112 } | |
| 113 | |
| 114 public void remove() { | |
| 115 keyIterator.remove(); | |
| 116 } | |
| 117 }; | |
| 118 } | |
| 119 | |
| 120 public int size() { | |
| 85 | 121 return fkeySet.size(); |
| 78 | 122 } |
| 123 | |
| 85 | 124 public override String toString(){ |
| 125 return super.toString(); | |
| 126 } | |
| 78 | 127 } |
| 128 | |
| 129 /** | |
| 130 * @param keySet | |
| 131 */ | |
| 85 | 132 public this(IObservableSet _keySet) { |
| 133 setChangeListener = new SetChangeListener(); | |
| 134 fentrySet = new EntrySet(); | |
| 135 super(_keySet.getRealm()); | |
| 136 this.fkeySet = _keySet; | |
| 137 this.fkeySet.addSetChangeListener(setChangeListener); | |
| 78 | 138 } |
| 139 | |
| 140 protected void init() { | |
| 85 | 141 for (Iterator it = this.fkeySet.iterator(); it.hasNext();) { |
| 78 | 142 Object key = it.next(); |
| 143 hookListener(key); | |
| 144 } | |
| 145 } | |
| 146 | |
| 147 protected final void fireSingleChange(Object key, Object oldValue, | |
| 148 Object newValue) { | |
| 149 fireMapChange(Diffs.createMapDiffSingleChange(key, oldValue, newValue)); | |
| 150 } | |
| 151 | |
| 152 public Set entrySet() { | |
| 85 | 153 return fentrySet; |
| 78 | 154 } |
| 155 | |
| 156 public Set keySet() { | |
| 85 | 157 return fkeySet; |
| 78 | 158 } |
| 159 | |
| 160 final public Object get(Object key) { | |
| 161 return doGet(key); | |
| 162 } | |
| 163 | |
| 164 final public Object put(Object key, Object value) { | |
| 165 return doPut(key, value); | |
| 166 } | |
| 167 | |
| 168 /** | |
| 169 * @param removedKey | |
| 170 */ | |
| 171 protected abstract void unhookListener(Object removedKey); | |
| 172 | |
| 173 /** | |
| 174 * @param addedKey | |
| 175 */ | |
| 176 protected abstract void hookListener(Object addedKey); | |
| 177 | |
| 178 /** | |
| 179 * @param key | |
| 180 * @return the value for the given key | |
| 181 */ | |
| 182 protected abstract Object doGet(Object key); | |
| 183 | |
| 184 /** | |
| 185 * @param key | |
| 186 * @param value | |
| 187 * @return the old value for the given key | |
| 188 */ | |
| 189 protected abstract Object doPut(Object key, Object value); | |
| 190 } |