| /******************************************************************************* |
| * Copyright (c) 2009, 2010 Matthew Hall 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: |
| * Matthew Hall - initial API and implementation (bug 265727) |
| ******************************************************************************/ |
| |
| package org.eclipse.core.databinding.property.list; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.Realm; |
| import org.eclipse.core.databinding.observable.list.IObservableList; |
| import org.eclipse.core.databinding.observable.list.ListDiff; |
| import org.eclipse.core.databinding.observable.list.ListDiffEntry; |
| import org.eclipse.core.databinding.observable.list.ListDiffVisitor; |
| import org.eclipse.core.databinding.observable.list.MultiList; |
| import org.eclipse.core.internal.databinding.property.PropertyObservableUtil; |
| |
| /** |
| * A list property for observing multiple list properties in sequence in a |
| * combined list. |
| * |
| * @param <S> |
| * type of the source object |
| * @param <E> |
| * type of the elements in the list |
| * @since 1.2 |
| */ |
| public class MultiListProperty<S, E> extends ListProperty<S, E> { |
| private IListProperty<S, E>[] properties; |
| private Object elementTypeAsObject; |
| private Class<E> elementType; |
| |
| /** |
| * Constructs a MultiListProperty for observing the specified list |
| * properties in sequence |
| * |
| * @param properties |
| * the list properties |
| */ |
| public MultiListProperty(IListProperty<S, E>[] properties) { |
| this(properties, null); |
| } |
| |
| /** |
| * Constructs a MultiListProperty for observing the specified list |
| * properties in sequence. |
| * |
| * @param properties |
| * the list properties |
| * @param elementType |
| * the element type of the MultiListProperty |
| */ |
| public MultiListProperty(IListProperty<S, E>[] properties, |
| Object elementType) { |
| this.properties = properties; |
| this.elementTypeAsObject = elementType; |
| this.elementType = null; |
| } |
| |
| /** |
| * @param properties |
| * @param elementType |
| * @since 1.5 |
| */ |
| public MultiListProperty(IListProperty<S, E>[] properties, |
| Class<E> elementType) { |
| this.properties = properties; |
| this.elementTypeAsObject = elementType; |
| this.elementType = elementType; |
| } |
| |
| public Object getElementType() { |
| return elementTypeAsObject; |
| } |
| |
| /** |
| * @since 1.5 |
| */ |
| public Class<E> getElementClass() { |
| return elementType; |
| } |
| |
| protected List<E> doGetList(S source) { |
| List<E> list = new ArrayList<E>(); |
| for (int i = 0; i < properties.length; i++) |
| list.addAll(properties[i].getList(source)); |
| return list; |
| } |
| |
| protected void doUpdateList(final S source, ListDiff<E> diff) { |
| diff.accept(new ListDiffVisitor<E>() { |
| public void handleAdd(int index, E element) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void handleMove(int oldIndex, int newIndex, E element) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void handleReplace(int index, E oldElement, E newElement) { |
| int offset = 0; |
| for (int i = 0; i < properties.length; i++) { |
| List<E> subList = properties[i].getList(source); |
| if (index - offset < subList.size()) { |
| int subListIndex = index - offset; |
| List<ListDiffEntry<E>> entries = new ArrayList<ListDiffEntry<E>>( |
| 2); |
| entries.add(Diffs.createListDiffEntry(subListIndex, |
| false, oldElement)); |
| entries.add(Diffs.createListDiffEntry(subListIndex, |
| true, newElement)); |
| ListDiff<E> diff = Diffs.createListDiff(entries); |
| properties[i].updateList(source, diff); |
| return; |
| } |
| offset += subList.size(); |
| } |
| throw new IndexOutOfBoundsException("index: " + index //$NON-NLS-1$ |
| + ", size: " + offset); //$NON-NLS-1$ |
| } |
| |
| public void handleRemove(int index, E element) { |
| int offset = 0; |
| for (int i = 0; i < properties.length; i++) { |
| List<E> subList = properties[i].getList(source); |
| int subListIndex = index - offset; |
| if (subListIndex < subList.size()) { |
| ListDiff<E> diff = Diffs.createListDiff(Diffs |
| .createListDiffEntry(subListIndex, false, |
| element)); |
| properties[i].updateList(source, diff); |
| return; |
| } |
| offset += subList.size(); |
| } |
| throw new IndexOutOfBoundsException("index: " + index //$NON-NLS-1$ |
| + ", size: " + offset); //$NON-NLS-1$ |
| } |
| }); |
| } |
| |
| public IObservableList<E> observe(Realm realm, S source) { |
| List<IObservableList<E>> lists = new ArrayList<IObservableList<E>>( |
| properties.length); |
| for (int i = 0; i < properties.length; i++) { |
| lists.add(properties[i].observe(realm, source)); |
| } |
| IObservableList<E> multiList = new MultiList<E>(lists, elementType); |
| |
| for (IObservableList<E> list : lists) { |
| PropertyObservableUtil.cascadeDispose(multiList, list); |
| } |
| |
| return multiList; |
| } |
| } |