+++ /dev/null
-/*******************************************************************************
- * Copyright (c) 2000, 2004 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 net.sourceforge.phpdt.internal.ui.viewsupport;
-
-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.jface.viewers.IViewerLabelProvider;
-import org.eclipse.jface.viewers.ViewerLabel;
-
-import net.sourceforge.phpdt.core.ICompilationUnit;
-import net.sourceforge.phpdt.core.IJavaElement;
-
-/**
- * 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.
- */
-public 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();
-
- // If it is an IItemLabelProvider than short circuit: patch Tod (bug 55012)
- if (lprovider instanceof IViewerLabelProvider) {
- IViewerLabelProvider provider= (IViewerLabelProvider) lprovider;
-
- ViewerLabel updateLabel= new ViewerLabel(item.getText(), item.getImage());
- provider.updateLabel(updateLabel, data);
-
- if (updateLabel.hasNewImage()) {
- item.setImage(updateLabel.getImage());
- }
- if (updateLabel.hasNewText()) {
- item.setText(updateLabel.getText());
- }
- } else {
- Image oldImage= item.getImage();
- Image image= lprovider.getImage(data);
- if (image != null && !image.equals(oldImage)) {
- item.setImage(image);
- }
- String oldText= item.getText();
- String text= lprovider.getText(data);
- if (text != null && !text.equals(oldText)) {
- item.setText(text);
- }
- }
- }
- }
-
- /**
- * 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= getCorrespondingResource(element);
- 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= getCorrespondingResource(element);
- 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();
- }
-
- /**
- * Tests if the map is empty
- */
- public boolean isEmpty() {
- return fResourceToItem.isEmpty();
- }
-
- /**
- * Method that decides which elements can have error markers
- * Returns null if an element can not have error markers.
- */
- private static IResource getCorrespondingResource(Object element) {
- if (element instanceof IJavaElement) {
- IJavaElement elem= (IJavaElement) element;
- if (!elem.isReadOnly()) { // only modifieable elements can get error ticks
- IResource res= elem.getResource();
- if (res == null) {
- ICompilationUnit cu= (ICompilationUnit) elem.getAncestor(IJavaElement.COMPILATION_UNIT);
- if (cu != null) {
- // elements in compilation units are mapped to the underlying resource of the original cu
- res= cu.getResource();
- }
- }
- return res;
- }
- return null;
- } else if (element instanceof IResource) {
- return (IResource) element;
- }
- return null;
- }
-
-}
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