Case Study: adding data and statistics

[ifi-stolz-refaktor.git] / case-study / jdt-after / ui / org / eclipse / jdt / internal / ui / viewsupport / ProblemTableViewer.java

diff --git a/case-study/jdt-after/ui/org/eclipse/jdt/internal/ui/viewsupport/ProblemTableViewer.java b/case-study/jdt-after/ui/org/eclipse/jdt/internal/ui/viewsupport/ProblemTableViewer.java
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+/*******************************************************************************
+ * Copyright (c) 2000, 2011 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
+ *******************************************************************************/
+
+package org.eclipse.jdt.internal.ui.viewsupport;
+
+import java.util.ArrayList;
+
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Item;
+import org.eclipse.swt.widgets.Table;
+import org.eclipse.swt.widgets.Widget;
+
+import org.eclipse.core.resources.IResource;
+
+import org.eclipse.jface.viewers.IBaseLabelProvider;
+import org.eclipse.jface.viewers.LabelProviderChangedEvent;
+import org.eclipse.jface.viewers.TableViewer;
+
+import org.eclipse.jdt.ui.IWorkingCopyProvider;
+import org.eclipse.jdt.ui.ProblemsLabelDecorator.ProblemsLabelChangedEvent;
+
+/**
+ * Extends a  TableViewer to allow more performance when showing error ticks.
+ * A <code>ProblemItemMapper</code> is contained that maps all items in
+ * the tree to underlying resource
+ */
+public class ProblemTableViewer extends TableViewer implements ResourceToItemsMapper.IContentViewerAccessor {
+
+       protected ResourceToItemsMapper fResourceToItemsMapper;
+
+       /**
+        * Constructor for ProblemTableViewer.
+        * 
+        * @param parent the parent composite
+        */
+       public ProblemTableViewer(Composite parent) {
+               super(parent);
+               initMapper();
+       }
+
+       /**
+        * Constructor for ProblemTableViewer.
+        * 
+        * @param parent the parent composite
+        * @param style the style
+        */
+       public ProblemTableViewer(Composite parent, int style) {
+               super(parent, style);
+               initMapper();
+       }
+
+       /**
+        * Constructor for ProblemTableViewer.
+        * 
+        * @param table the table
+        */
+       public ProblemTableViewer(Table table) {
+               super(table);
+               initMapper();
+       }
+
+       private void initMapper() {
+               fResourceToItemsMapper= new ResourceToItemsMapper(this);
+       }
+
+       /* (non-Javadoc)
+        * @see org.eclipse.jdt.internal.ui.viewsupport.ResourceToItemsMapper.IContentViewerAccessor#doUpdateItem(org.eclipse.swt.widgets.Widget)
+        */
+       public void doUpdateItem(Widget item) {
+               doUpdateItem(item, item.getData(), true);
+       }
+
+       /*
+        * @see StructuredViewer#mapElement(Object, Widget)
+        */
+       @Override
+       protected void mapElement(Object element, Widget item) {
+               super.mapElement(element, item);
+               if (item instanceof Item) {
+                       fResourceToItemsMapper.addToMap(element, (Item) item);
+               }
+       }
+
+       /*
+        * @see StructuredViewer#unmapElement(Object, Widget)
+        */
+       @Override
+       protected void unmapElement(Object element, Widget item) {
+               if (item instanceof Item) {
+                       fResourceToItemsMapper.removeFromMap(element, (Item) item);
+               }
+               super.unmapElement(element, item);
+       }
+
+       /*
+        * @see StructuredViewer#unmapAllElements()
+        */
+       @Override
+       protected void unmapAllElements() {
+               fResourceToItemsMapper.clearMap();
+               super.unmapAllElements();
+       }
+
+       /*
+        * @see ContentViewer#handleLabelProviderChanged(LabelProviderChangedEvent)
+        */
+       @Override
+       protected void handleLabelProviderChanged(LabelProviderChangedEvent event) {
+               if (event instanceof ProblemsLabelChangedEvent) {
+                       ProblemsLabelChangedEvent e= (ProblemsLabelChangedEvent) event;
+                       if (!e.isMarkerChange() && canIgnoreChangesFromAnnotionModel()) {
+                               return;
+                       }
+               }
+
+               Object[] changed= event.getElements();
+               if (changed != null && !fResourceToItemsMapper.isEmpty()) {
+                       ArrayList<Object> others= new ArrayList<Object>(changed.length);
+                       for (int i= 0; i < changed.length; i++) {
+                               Object curr= changed[i];
+                               if (curr instanceof IResource) {
+                                       fResourceToItemsMapper.resourceChanged((IResource) curr);
+                               } else {
+                                       others.add(curr);
+                               }
+                       }
+                       if (others.isEmpty()) {
+                               return;
+                       }
+                       event= new LabelProviderChangedEvent((IBaseLabelProvider) event.getSource(), others.toArray());
+               }
+               super.handleLabelProviderChanged(event);
+       }
+
+       /**
+        * Answers whether this viewer can ignore label provider changes resulting from
+        * marker changes in annotation models
+        * @return returns <code>true</code> if annotation model changes can be ignored
+        */
+       private boolean canIgnoreChangesFromAnnotionModel() {
+               Object contentProvider= getContentProvider();
+               return contentProvider instanceof IWorkingCopyProvider && !((IWorkingCopyProvider)contentProvider).providesWorkingCopies();
+       }
+}