| /******************************************************************************* |
| * Copyright (c) 2009 Oracle. 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: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.common.utility.model.event; |
| |
| import java.util.List; |
| |
| import org.eclipse.jpt.common.utility.internal.StringTools; |
| import org.eclipse.jpt.common.utility.internal.iterables.ArrayIterable; |
| import org.eclipse.jpt.common.utility.model.Model; |
| |
| /** |
| * A "list replace" event gets delivered whenever a model replaces items in a |
| * "bound" or "constrained" list. A <code>ListReplaceEvent</code> is sent as an |
| * argument to the {@link org.eclipse.jpt.common.utility.model.listener.ListChangeListener}. |
| * <p> |
| * Provisional API: This class is part of an interim API that is still |
| * under development and expected to change significantly before reaching |
| * stability. It is available at this early stage to solicit feedback from |
| * pioneering adopters on the understanding that any code that uses this API |
| * will almost certainly be broken (repeatedly) as the API evolves. |
| */ |
| public final class ListReplaceEvent extends ListEvent { |
| |
| /** The index at which the items were replaced. */ |
| private final int index; |
| |
| /** The new items that replaced the old items in the list. */ |
| private final Object[] newItems; |
| |
| /** The old items that were replaced by the new items in the list. */ |
| private final Object[] oldItems; |
| |
| private static final long serialVersionUID = 1L; |
| |
| |
| // ********** constructors ********** |
| |
| /** |
| * Construct a new list replace event for a list of replaced items. |
| * |
| * @param source The object on which the event initially occurred. |
| * @param listName The programmatic name of the list that was changed. |
| * @param index The index at which the item in the list was replaced. |
| * @param newItem The new item in the list. |
| * @param oldItem The old item in the list that were replaced. |
| */ |
| public ListReplaceEvent(Model source, String listName, int index, Object newItem, Object oldItem) { |
| this(source, listName, index, new Object[] {newItem}, new Object[] {oldItem}); |
| } |
| |
| /** |
| * Construct a new list replace event for a list of replaced items. |
| * |
| * @param source The object on which the event initially occurred. |
| * @param listName The programmatic name of the list that was changed. |
| * @param index The index at which the items in the list were replaced. |
| * @param newItems The new items in the list. |
| * @param oldItems The old items in the list that were replaced. |
| */ |
| public ListReplaceEvent(Model source, String listName, int index, List<?> newItems, List<?> oldItems) { |
| this(source, listName, index, newItems.toArray(), oldItems.toArray()); // NPE if either 'newItems' or 'oldItems' is null |
| } |
| |
| private ListReplaceEvent(Model source, String listName, int index, Object[] newItems, Object[] oldItems) { |
| super(source, listName); |
| if (newItems.length != oldItems.length) { |
| throw new IllegalArgumentException("sizes must match - new items size: " + newItems.length //$NON-NLS-1$ |
| + " old items size: " + oldItems.length); //$NON-NLS-1$ |
| } |
| this.index = index; |
| this.newItems = newItems; |
| this.oldItems = oldItems; |
| } |
| |
| |
| // ********** standard state ********** |
| |
| /** |
| * Return the index at which the items were replaced in the list. |
| */ |
| public int getIndex() { |
| return this.index; |
| } |
| |
| /** |
| * Return the new items that replaced the old items in the list. |
| */ |
| public Iterable<?> getNewItems() { |
| return new ArrayIterable<Object>(this.newItems); |
| } |
| |
| /** |
| * Return the old items that were replaced by the new items in the list. |
| */ |
| public Iterable<?> getOldItems() { |
| return new ArrayIterable<Object>(this.oldItems); |
| } |
| |
| /** |
| * Return the number of items that were replaced. |
| */ |
| public int getItemsSize() { |
| return this.newItems.length; |
| } |
| |
| @Override |
| protected void toString(StringBuilder sb) { |
| super.toString(sb); |
| sb.append(": "); //$NON-NLS-1$ |
| StringTools.append(sb, this.oldItems); |
| sb.append(" => "); //$NON-NLS-1$ |
| StringTools.append(sb, this.newItems); |
| } |
| |
| |
| // ********** cloning ********** |
| |
| /** |
| * Return a copy of the event with the specified source |
| * replacing the current source. |
| */ |
| public ListReplaceEvent clone(Model newSource) { |
| return this.clone(newSource, this.listName); |
| } |
| |
| /** |
| * Return a copy of the event with the specified source and list name |
| * replacing the current source and list name. |
| */ |
| public ListReplaceEvent clone(Model newSource, String newListName) { |
| return this.clone(newSource, newListName, 0); |
| } |
| |
| /** |
| * Return a copy of the event with the specified source and list name |
| * replacing the current source and list name and displacing |
| * the index by the specified amount. |
| */ |
| public ListReplaceEvent clone(Model newSource, String newListName, int offset) { |
| return new ListReplaceEvent(newSource, newListName, this.index + offset, this.newItems, this.oldItems); |
| } |
| |
| } |