diff -r 14dc2103a631 -r ed1c9f64298a trace/tracebuilder/com.nokia.tracebuilder/src/com/nokia/tracebuilder/utils/DocumentMonitorBase.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trace/tracebuilder/com.nokia.tracebuilder/src/com/nokia/tracebuilder/utils/DocumentMonitorBase.java	Wed Jun 23 14:35:40 2010 +0300
@@ -0,0 +1,168 @@
+/*
+* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:
+*
+* Base class for document monitors
+*
+*/
+package com.nokia.tracebuilder.utils;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+
+import com.nokia.tracebuilder.source.OffsetLength;
+import com.nokia.tracebuilder.source.SourceDocumentFactory;
+import com.nokia.tracebuilder.source.SourceDocumentInterface;
+import com.nokia.tracebuilder.source.SourceDocumentMonitor;
+import com.nokia.tracebuilder.source.SourceDocumentProcessor;
+
+/**
+ * Base class for document monitors.
+ * 
+ */
+public class DocumentMonitorBase implements SourceDocumentMonitor {
+
+	/**
+	 * Zero offset, zero length
+	 */
+	private static final OffsetLength ZERO_OFFSET_LENGTH = new OffsetLength();
+
+	/**
+	 * Document factory adapter
+	 */
+	private DocumentFactoryBase factory;
+
+	/**
+	 * Document processor
+	 */
+	private SourceDocumentProcessor processor;
+
+	/**
+	 * List of sources
+	 */
+	private ArrayList<SourceDocumentInterface> sources = new ArrayList<SourceDocumentInterface>();
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.nokia.tracebuilder.source.SourceDocumentMonitor#getFactory()
+	 */
+	public SourceDocumentFactory getFactory() {
+		if (factory == null) {
+			factory = new DocumentFactoryBase();
+		}
+		return factory;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.nokia.tracebuilder.source.SourceDocumentMonitor#getSelectedSource()
+	 */
+	public SourceDocumentInterface getSelectedSource() {
+		return null;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.nokia.tracebuilder.source.SourceDocumentMonitor#
+	 *      getSelection(com.nokia.tracebuilder.source.SourceDocumentInterface)
+	 */
+	public OffsetLength getSelection(SourceDocumentInterface props) {
+		return ZERO_OFFSET_LENGTH;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see java.lang.Iterable#iterator()
+	 */
+	public Iterator<SourceDocumentInterface> iterator() {
+		return sources.iterator();
+	}
+
+	/**
+	 * Adds a source to this monitor and notifies the document processor
+	 * 
+	 * @param source
+	 *            the source to be added
+	 */
+	protected void addSource(SourceDocumentInterface source) {
+		sources.add(source);
+		processor.sourceOpened(source);
+	}
+
+	/**
+	 * Removes a source from this monitor and calls the document processor
+	 * 
+	 * @param source
+	 *            the source to be removed
+	 */
+	protected void removeSource(SourceDocumentInterface source) {
+		sources.remove(source);
+		processor.sourceClosed(source);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.nokia.tracebuilder.source.SourceDocumentMonitor#
+	 *      isSourceEditable(com.nokia.tracebuilder.source.SourceDocumentInterface)
+	 */
+	public boolean isSourceEditable(SourceDocumentInterface selectedSource) {
+		return false;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.nokia.tracebuilder.source.SourceDocumentMonitor#setFocus()
+	 */
+	public void setFocus() {
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.nokia.tracebuilder.source.SourceDocumentMonitor#
+	 *      startMonitor(com.nokia.tracebuilder.source.SourceDocumentProcessor)
+	 */
+	public void startMonitor(SourceDocumentProcessor processor) {
+		this.processor = processor;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.nokia.tracebuilder.source.SourceDocumentMonitor#stopMonitor()
+	 */
+	public void stopMonitor() {
+		for (SourceDocumentInterface document : sources) {
+			processor.sourceClosed(document);
+		}
+		sources.clear();
+		processor = null;
+	}
+
+	/**
+	 * Gets the source processor
+	 * 
+	 * @return the processor
+	 */
+	protected SourceDocumentProcessor getProcessor() {
+		return processor;
+	}
+
+}
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