Mercurial > projects > dwt2
view org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/observable/EmptyObservableList.d @ 85:6be48cf9f95c
Work on databinding
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 18 Apr 2009 13:54:50 +0200 |
parents | 0a55d2d5a946 |
children |
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/******************************************************************************* * Copyright (c) 2006, 2008 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Matthew Hall - bug 208858 * Matthew Hall - bug 208332 *******************************************************************************/ module org.eclipse.core.internal.databinding.observable.EmptyObservableList; import java.lang.all; import java.util.Collection; import java.util.Collections; import java.util.Iterator; import java.util.List; import java.util.ListIterator; import org.eclipse.core.databinding.observable.IChangeListener; import org.eclipse.core.databinding.observable.IStaleListener; import org.eclipse.core.databinding.observable.Realm; import org.eclipse.core.databinding.observable.list.IListChangeListener; import org.eclipse.core.databinding.observable.list.IObservableList; import org.eclipse.core.runtime.Assert; /** * Singleton empty list */ public class EmptyObservableList : IObservableList { // DWT start: additional methods in List public bool add(String o) { return add(stringcast(o)); } public bool remove(String o) { return remove(stringcast(o)); } public bool contains(String o) { return contains(stringcast(o)); } public int opApply (int delegate(ref Object value) dg){ auto it = iterator(); while(it.hasNext()){ auto v = it.next(); int res = dg( v ); if( res ) return res; } return 0; } public String[] toArray( String[] a ){ auto d = toArray(); if( a.length < d.length ){ a.length = d.length; } for( int i = 0; i < d.length; i++ ){ a[i] = stringcast(d[i]); } return a; } // DWT end: additional methods in List private static List emptyList; static this(){ emptyList = Collections.EMPTY_LIST; } private Realm realm; private Object elementType; /** * Creates an empty list. This list may be disposed multiple times * without any side-effects. * * @param realm * the realm of the constructed list */ public this(Realm realm) { this(realm, null); } /** * Creates an empty list. This list may be disposed multiple times * without any side-effects. * * @param realm * the realm of the constructed list * @param elementType * the element type of the constructed list * @since 1.1 */ public this(Realm realm, Object elementType) { this.realm = realm; this.elementType = elementType; } public void addListChangeListener(IListChangeListener listener) { // ignore } public void removeListChangeListener(IListChangeListener listener) { // ignore } public Object getElementType() { return elementType; } public int size() { checkRealm(); return 0; } void checkRealm() { Assert.isTrue(realm.isCurrent(), "Observable cannot be accessed outside its realm"); //$NON-NLS-1$ } public bool isEmpty() { checkRealm(); return true; } public bool contains(Object o) { checkRealm(); return false; } public Iterator iterator() { checkRealm(); return emptyList.iterator(); } public Object[] toArray() { checkRealm(); return emptyList.toArray(); } public Object[] toArray(Object[] a) { return emptyList.toArray(a); } public bool add(Object o) { throw new UnsupportedOperationException(); } public bool remove(Object o) { throw new UnsupportedOperationException(); } public bool containsAll(Collection c) { checkRealm(); return c.isEmpty(); } public bool addAll(Collection c) { throw new UnsupportedOperationException(); } public bool retainAll(Collection c) { throw new UnsupportedOperationException(); } public bool removeAll(Collection c) { throw new UnsupportedOperationException(); } public void clear() { throw new UnsupportedOperationException(); } public void addChangeListener(IChangeListener listener) { } public void removeChangeListener(IChangeListener listener) { } public void addStaleListener(IStaleListener listener) { } public void removeStaleListener(IStaleListener listener) { } public bool isStale() { checkRealm(); return false; } public void dispose() { } public bool addAll(int index, Collection c) { throw new UnsupportedOperationException(); } public Object get(int index) { return emptyList.get(index); } public int indexOf(Object o) { return -1; } public int lastIndexOf(Object o) { return -1; } public ListIterator listIterator() { return emptyList.listIterator(); } public ListIterator listIterator(int index) { return emptyList.listIterator(index); } public Object remove(int index) { throw new UnsupportedOperationException(); } public Object set(int index, Object element) { throw new UnsupportedOperationException(); } public Object move(int oldIndex, int newIndex) { throw new UnsupportedOperationException(); } public List subList(int fromIndex, int toIndex) { return emptyList.subList(fromIndex, toIndex); } public void add(int index, Object o) { throw new UnsupportedOperationException(); } public Realm getRealm() { return realm; } public override equals_t opEquals(Object obj) { checkRealm(); if (obj is this) return true; if (obj is null) return false; if (!( null !is cast(List)obj )) return false; return (cast(List) obj).isEmpty(); } public hash_t toHash() { checkRealm(); return 1; } }