| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.search.internal.ui; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Stack; |
| |
| import org.eclipse.core.resources.IResource; |
| |
| import org.eclipse.swt.graphics.Image; |
| import org.eclipse.swt.widgets.Item; |
| |
| import org.eclipse.jface.viewers.ContentViewer; |
| import org.eclipse.jface.viewers.ILabelProvider; |
| |
| import org.eclipse.search.ui.ISearchResultViewEntry; |
| |
| /** |
| * Helper class for updating error markers and other decorators that work on resources. |
| * Items are mapped to their element's underlying resource. |
| * Method <code>resourceChanged</code> updates all items that are affected from the changed |
| * elements. |
| */ |
| class ResourceToItemsMapper { |
| |
| private static final int NUMBER_LIST_REUSE= 10; |
| |
| // map from resource to item |
| private HashMap fResourceToItem; |
| private Stack fReuseLists; |
| |
| private ContentViewer fContentViewer; |
| |
| public ResourceToItemsMapper(ContentViewer viewer) { |
| fResourceToItem= new HashMap(); |
| fReuseLists= new Stack(); |
| |
| fContentViewer= viewer; |
| } |
| |
| /** |
| * Must be called from the UI thread. |
| */ |
| public void resourceChanged(IResource changedResource) { |
| Object obj= fResourceToItem.get(changedResource); |
| if (obj == null) { |
| // not mapped |
| } else if (obj instanceof Item) { |
| updateItem((Item) obj); |
| } else { // List of Items |
| List list= (List) obj; |
| for (int k= 0; k < list.size(); k++) { |
| updateItem((Item) list.get(k)); |
| } |
| } |
| } |
| |
| private void updateItem(Item item) { |
| if (!item.isDisposed()) { // defensive code |
| ILabelProvider lprovider= (ILabelProvider) fContentViewer.getLabelProvider(); |
| |
| Object data= item.getData(); |
| |
| String oldText= item.getText(); |
| String text= lprovider.getText(data); |
| if (text != null && !text.equals(oldText)) { |
| item.setText(text); |
| } |
| |
| Image oldImage= item.getImage(); |
| Image image= lprovider.getImage(data); |
| if (image != null && !image.equals(oldImage)) { |
| item.setImage(image); |
| } |
| } |
| } |
| |
| /** |
| * Adds a new item to the map. |
| * @param element Element to map |
| * @param item The item used for the element |
| */ |
| public void addToMap(Object element, Item item) { |
| IResource resource= ((ISearchResultViewEntry)element).getResource(); |
| if (resource != null) { |
| Object existingMapping= fResourceToItem.get(resource); |
| if (existingMapping == null) { |
| fResourceToItem.put(resource, item); |
| } else if (existingMapping instanceof Item) { |
| if (existingMapping != item) { |
| List list= getNewList(); |
| list.add(existingMapping); |
| list.add(item); |
| fResourceToItem.put(resource, list); |
| } |
| } else { // List |
| List list= (List) existingMapping; |
| if (!list.contains(item)) { |
| list.add(item); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Removes an element from the map. |
| */ |
| public void removeFromMap(Object element, Item item) { |
| IResource resource= ((ISearchResultViewEntry)element).getResource(); |
| if (resource != null) { |
| Object existingMapping= fResourceToItem.get(resource); |
| if (existingMapping == null) { |
| return; |
| } else if (existingMapping instanceof Item) { |
| fResourceToItem.remove(resource); |
| } else { // List |
| List list= (List) existingMapping; |
| list.remove(item); |
| if (list.isEmpty()) { |
| fResourceToItem.remove(list); |
| releaseList(list); |
| } |
| } |
| } |
| } |
| |
| private List getNewList() { |
| if (!fReuseLists.isEmpty()) { |
| return (List) fReuseLists.pop(); |
| } |
| return new ArrayList(2); |
| } |
| |
| private void releaseList(List list) { |
| if (fReuseLists.size() < NUMBER_LIST_REUSE) { |
| fReuseLists.push(list); |
| } |
| } |
| |
| /** |
| * Clears the map. |
| */ |
| public void clearMap() { |
| fResourceToItem.clear(); |
| } |
| |
| /** |
| * Clears the map. |
| */ |
| public boolean isEmpty() { |
| return fResourceToItem.isEmpty(); |
| } |
| } |