1 files changed, 114 insertions, 0 deletions
diff --git a/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/viewers/update/DefaultUpdatePolicy.java b/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/viewers/update/DefaultUpdatePolicy.java
new file mode 100644
index 000000000..55e90eadc
--- /dev/null
+++ b/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/viewers/update/DefaultUpdatePolicy.java
@@ -0,0 +1,114 @@
+/*******************************************************************************
+ * Copyright (c) 2005 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.debug.internal.ui.viewers.update;
+
+import java.util.ArrayList;
+
+import org.eclipse.debug.internal.ui.viewers.AsynchronousTreeViewer;
+import org.eclipse.debug.internal.ui.viewers.AsynchronousViewer;
+import org.eclipse.debug.internal.ui.viewers.IModelChangedListener;
+import org.eclipse.debug.internal.ui.viewers.IModelDelta;
+import org.eclipse.debug.internal.ui.viewers.IModelDeltaNode;
+import org.eclipse.debug.internal.ui.viewers.TreePath;
+import org.eclipse.debug.internal.ui.viewers.TreeSelection;
+
+/**
+ * Default update policy updates a viewer based on model deltas.
+ * 
+ * @since 3.2
+ */
+public class DefaultUpdatePolicy extends AbstractUpdatePolicy implements IModelChangedListener {
+
+	public void modelChanged(IModelDelta delta) {
+		IModelDeltaNode[] nodes = delta.getNodes();
+		updateNodes(nodes);
+	}
+
+	protected void updateNodes(IModelDeltaNode[] nodes) {
+		for (int i = 0; i < nodes.length; i++) {
+			IModelDeltaNode node = nodes[i];
+			int flags = node.getFlags();
+
+			if ((flags & IModelDelta.CHANGED) != 0) {
+				handleChange(node);
+			} else if ((flags & IModelDelta.ADDED) != 0) {
+				handleAdd(node);
+			} else if ((flags & IModelDelta.REMOVED) != 0) {
+				handleRemove(node);
+			}
+
+			IModelDeltaNode[] childNodes = node.getNodes();
+			for (int j = 0; j < childNodes.length; j++) {
+				updateNodes(childNodes);
+			}
+		}
+	}
+
+	protected void handleChange(IModelDeltaNode node) {
+		int flags = node.getFlags();
+		AsynchronousViewer viewer = getViewer();
+		if (viewer != null) {
+			if ((flags & IModelDelta.STATE) != 0) {
+				viewer.update(node.getElement());
+			}
+			if ((flags & IModelDelta.CONTENT) != 0) {
+				viewer.refresh(node.getElement());
+			}
+			if ((flags & IModelDelta.SELECT) != 0) {
+				viewer.update(node.getElement());
+				TreePath treePath = getTreePath(node);
+				((AsynchronousTreeViewer) getViewer()).setSelection(new TreeSelection(treePath));
+			}
+			if ((flags & IModelDelta.EXPAND) != 0) {
+				viewer.update(node.getElement());
+				TreePath treePath = getTreePath(node);
+				((AsynchronousTreeViewer) getViewer()).expand(new TreeSelection(treePath));
+			}
+		}
+	}
+
+	protected void handleAdd(IModelDeltaNode node) {
+		int flags = node.getFlags();
+		final TreePath treePath = getTreePath(node);
+
+		((AsynchronousTreeViewer) getViewer()).add(treePath);
+
+		if ((flags & IModelDelta.STATE) != 0) {
+			// do nothing??
+		}
+		if ((flags & IModelDelta.CONTENT) != 0) {
+			// do nothing??
+		}
+		if ((flags & IModelDelta.SELECT) != 0) {
+			((AsynchronousTreeViewer) getViewer()).setSelection(new TreeSelection(treePath));
+		}
+		if ((flags & IModelDelta.EXPAND) != 0) {
+			((AsynchronousTreeViewer) getViewer()).expand(new TreeSelection(treePath));
+		}
+	}
+
+	protected void handleRemove(IModelDeltaNode node) {
+		TreePath treePath = getTreePath(node);
+		((AsynchronousTreeViewer) getViewer()).remove(treePath);
+	}
+
+	protected TreePath getTreePath(IModelDeltaNode node) {
+		ArrayList list = new ArrayList();
+		list.add(0, node.getElement());
+		while (node.getParent() != null) {
+			node = node.getParent();
+			list.add(0, node.getElement());
+		}
+
+		return new TreePath(list.toArray());
+	}
+
+}