| /******************************************************************************* |
| * Copyright (c) 2005, 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 |
| *******************************************************************************/ |
| package org.eclipse.jface.internal.databinding.swt; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.List; |
| |
| import org.eclipse.core.databinding.BindingException; |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.ObservableTracker; |
| import org.eclipse.core.databinding.observable.Realm; |
| import org.eclipse.core.databinding.observable.list.AbstractObservableList; |
| |
| /** |
| * Abstract base class of CComboObservableList, ComboObservableList, and |
| * ListObservableList. |
| * |
| * @since 3.2 |
| * |
| */ |
| public abstract class SWTObservableList extends AbstractObservableList { |
| |
| /** |
| * |
| */ |
| public SWTObservableList() { |
| super(); |
| } |
| |
| /** |
| * @param realm |
| */ |
| public SWTObservableList(Realm realm) { |
| super(realm); |
| } |
| |
| public void add(int index, Object element) { |
| int size = doGetSize(); |
| if (index < 0 || index > size) |
| index = size; |
| String[] newItems = new String[size + 1]; |
| System.arraycopy(getItems(), 0, newItems, 0, index); |
| newItems[index] = (String) element; |
| System.arraycopy(getItems(), index, newItems, index + 1, size - index); |
| setItems(newItems); |
| fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(index, |
| true, element))); |
| } |
| |
| public int doGetSize() { |
| return getItemCount(); |
| } |
| |
| public Object get(int index) { |
| getterCalled(); |
| return getItem(index); |
| } |
| |
| public Object getElementType() { |
| return String.class; |
| } |
| |
| /** |
| * @param index |
| * @return the item at the given index |
| */ |
| protected abstract String getItem(int index); |
| |
| /** |
| * @return the item count |
| */ |
| protected abstract int getItemCount(); |
| |
| /** |
| * @return the items |
| */ |
| protected abstract String[] getItems(); |
| |
| private void getterCalled() { |
| ObservableTracker.getterCalled(this); |
| } |
| |
| public Object remove(int index) { |
| getterCalled(); |
| int size = doGetSize(); |
| if (index < 0 || index > size - 1) |
| throw new BindingException( |
| "Request to remove an element out of the collection bounds"); //$NON-NLS-1$ |
| |
| String[] newItems = new String[size - 1]; |
| String oldElement = getItem(index); |
| if (newItems.length > 0) { |
| System.arraycopy(getItems(), 0, newItems, 0, index); |
| if (size - 1 > index) { |
| System.arraycopy(getItems(), index + 1, newItems, index, size |
| - index - 1); |
| } |
| } |
| setItems(newItems); |
| fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(index, |
| false, oldElement))); |
| return oldElement; |
| } |
| |
| public Object set(int index, Object element) { |
| String oldElement = getItem(index); |
| setItem(index, (String) element); |
| fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(index, |
| false, oldElement), Diffs.createListDiffEntry(index, true, |
| element))); |
| return oldElement; |
| } |
| |
| public Object move(int oldIndex, int newIndex) { |
| checkRealm(); |
| if (oldIndex == newIndex) |
| return get(oldIndex); |
| int size = doGetSize(); |
| if (oldIndex < 0 || oldIndex >= size) |
| throw new IndexOutOfBoundsException( |
| "oldIndex: " + oldIndex + ", size:" + size); //$NON-NLS-1$ //$NON-NLS-2$ |
| if (newIndex < 0 || newIndex >= size) |
| throw new IndexOutOfBoundsException( |
| "newIndex: " + newIndex + ", size:" + size); //$NON-NLS-1$ //$NON-NLS-2$ |
| |
| String[] items = getItems(); |
| String[] newItems = new String[size]; |
| String element = items[oldIndex]; |
| if (newItems.length > 0) { |
| System.arraycopy(items, 0, newItems, 0, size); |
| if (oldIndex < newIndex) { |
| System.arraycopy(items, oldIndex + 1, newItems, oldIndex, |
| newIndex - oldIndex); |
| } else { |
| System.arraycopy(items, newIndex, newItems, newIndex + 1, |
| oldIndex - newIndex); |
| } |
| newItems[newIndex] = element; |
| } |
| setItems(newItems); |
| fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(oldIndex, |
| false, element), Diffs.createListDiffEntry(newIndex, true, |
| element))); |
| return element; |
| } |
| |
| public boolean removeAll(Collection c) { |
| checkRealm(); |
| List oldItems = Arrays.asList(getItems()); |
| List newItems = new ArrayList(oldItems); |
| boolean removedAll = newItems.removeAll(c); |
| if (removedAll) { |
| setItems((String[]) newItems.toArray(new String[newItems.size()])); |
| fireListChange(Diffs.computeListDiff(oldItems, newItems)); |
| } |
| return removedAll; |
| } |
| |
| public boolean retainAll(Collection c) { |
| checkRealm(); |
| List oldItems = Arrays.asList(getItems()); |
| List newItems = new ArrayList(oldItems); |
| boolean retainedAll = newItems.retainAll(c); |
| if (retainedAll) { |
| setItems((String[]) newItems.toArray(new String[newItems.size()])); |
| fireListChange(Diffs.computeListDiff(oldItems, newItems)); |
| } |
| return retainedAll; |
| } |
| |
| /** |
| * @param index |
| * @param string |
| */ |
| protected abstract void setItem(int index, String string); |
| |
| /** |
| * @param newItems |
| */ |
| protected abstract void setItems(String[] newItems); |
| |
| } |