1 files changed, 154 insertions, 0 deletions
diff --git a/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/viewers/update/DebugEventHandler.java b/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/viewers/update/DebugEventHandler.java
new file mode 100644
index 000000000..95ee46604
--- /dev/null
+++ b/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/viewers/update/DebugEventHandler.java
@@ -0,0 +1,154 @@
+/*******************************************************************************
+ * 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 org.eclipse.debug.core.DebugEvent;
+import org.eclipse.debug.core.DebugPlugin;
+import org.eclipse.debug.internal.ui.viewers.IModelDelta;
+import org.eclipse.debug.internal.ui.viewers.IModelProxy;
+
+/**
+ * Handles debug events for an event update policy in a viewer.
+ * 
+ * @since 3.2
+ */
+public abstract class DebugEventHandler {
+	
+	private IModelProxy fModelProxy;
+
+	/**
+	 * Constructs an event handler for the given update policy.
+	 * 
+	 * @param policy
+	 */
+	public DebugEventHandler(IModelProxy proxy) {
+		fModelProxy = proxy;
+	}
+	
+	/**
+	 * Disposes this event handler
+	 */
+	public void dispose() {
+		fModelProxy = null;
+	}
+		
+	/**
+	 * Returns the viewer this event handler is updating.
+	 * 
+	 * @return
+	 */
+	protected IModelProxy getModelProxy() {
+		return fModelProxy;
+	}
+
+	/**
+	 * Returns whether this event handler handles the given event
+	 * 
+	 * @param event event to handle
+	 * @return whether this event handler handles the given event
+	 */
+	protected abstract boolean handlesEvent(DebugEvent event);
+	
+	/**
+	 * Handles a create event. 
+	 * 
+	 * @param event
+	 */
+	protected void handleCreate(DebugEvent event) {
+		refreshRoot(event);
+	}
+		
+	/**
+	 * Handles a terminate event.
+	 * 
+	 * @param event
+	 */
+	protected void handleTerminate(DebugEvent event) {
+		refreshRoot(event);
+	}
+	
+	/**
+	 * Handles a suspend event.
+	 * 
+	 * @param event
+	 */	
+	protected void handleSuspend(DebugEvent event) {
+		refreshRoot(event);
+	}
+	
+	/**
+	 * Handles a resume event for which a suspend is expected shortly (<500ms).
+	 * 
+	 * @param event
+	 */
+	protected void handleResumeExpectingSuspend(DebugEvent event) {
+		refreshRoot(event);
+	}
+	
+	/**
+	 * Handles a resume event that is not expecting an immediate suspend event
+	 * 
+	 * @param event
+	 */
+	protected void handleResume(DebugEvent event) {
+		refreshRoot(event);
+	}
+	
+	/**
+	 * Handles a change event. 
+	 * 
+	 * @param event
+	 */
+	protected void handleChange(DebugEvent event) {
+		refreshRoot(event);
+	}	
+
+	/**
+	 * Handles an unknown event.
+	 * 
+	 * @param event
+	 */
+	protected void handleOther(DebugEvent event) {
+		refreshRoot(event);
+	}
+	
+	/**
+	 * Notification that a pending suspend event was not received for the given
+	 * resume event within the timeout period.
+	 * 
+	 * @param resume resume event with missing suspend event
+	 */
+	protected void handleSuspendTimeout(DebugEvent event) {
+		refreshRoot(event);
+	}
+	
+	/**
+	 * Handles the given suspend event which caused a timeout. It is
+	 * parired with its original resume event.
+	 * 
+	 * @param suspend suspend event
+	 * @param resume resume event
+	 */
+	protected void handleLateSuspend(DebugEvent suspend, DebugEvent resume) {
+		refreshRoot(suspend);
+	}
+
+	/**
+	 * Fires a model delta to indicate that the launch manager should be refreshed.
+	 * Subclasses should override individual handle events to provide deltas that
+	 * better reflect the actual change in the model.
+	 */
+	protected void refreshRoot(DebugEvent event) {
+		ModelDelta delta = new ModelDelta();
+		delta.addNode(DebugPlugin.getDefault().getLaunchManager(), IModelDelta.CHANGED | IModelDelta.CONTENT);
+		getModelProxy().fireModelChanged(delta);
+	}
+}