X-Git-Url: http://secure.phpeclipse.com

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/viewsupport/ResourceToItemsMapper.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/viewsupport/ResourceToItemsMapper.java
new file mode 100644
index 0000000..ee58b89
--- /dev/null
+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/viewsupport/ResourceToItemsMapper.java
@@ -0,0 +1,206 @@
+/*******************************************************************************
+ * 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;
+	}
+	
+}