diff -r ed1c9f64298a -r 5b9d4d8641ce trace/traceviewer/com.nokia.traceviewer/src/com/nokia/traceviewer/engine/DecodeProvider.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trace/traceviewer/com.nokia.traceviewer/src/com/nokia/traceviewer/engine/DecodeProvider.java	Wed Jun 23 14:49:59 2010 +0300
@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2007-2010 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:
+ *
+ * DecodeProvider provides decoding to the TraceViewer engine
+ *
+ */
+package com.nokia.traceviewer.engine;
+
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+
+import com.nokia.traceviewer.engine.activation.TraceActivationComponentItem;
+
+/**
+ * DecodeProvider interface
+ */
+public interface DecodeProvider {
+
+	/**
+	 * Decodes trace from dataBuffer and returns properties
+	 * 
+	 * @param dataBuffer
+	 *            dataBuffer
+	 * @param properties
+	 *            trace properties
+	 * @return trace properties
+	 */
+	public TraceProperties decodeTrace(ByteBuffer dataBuffer,
+			TraceProperties properties);
+
+	/**
+	 * Gets trace activation information (list of components having groups)
+	 * 
+	 * @param getAlsoTraces
+	 *            if true, also traces are added to the activation model. If
+	 *            false, traces arrays in groups are empty.
+	 * @return trace activation information
+	 */
+	public ArrayList<TraceActivationComponentItem> getActivationInformation(
+			boolean getAlsoTraces);
+
+	/**
+	 * Gets component name with component ID
+	 * 
+	 * @param componentId
+	 *            component ID
+	 * @return component name or null if not found
+	 */
+	public String getComponentName(int componentId);
+
+	/**
+	 * Gets group ID with component ID and group name
+	 * 
+	 * @param componentId
+	 *            component ID
+	 * @param groupName
+	 *            group name
+	 * @return group ID or -1 if not found
+	 */
+	public int getGroupId(int componentId, String groupName);
+
+	/**
+	 * Gets group name with component and group IDs
+	 * 
+	 * @param componentId
+	 *            component ID
+	 * @param groupId
+	 *            group ID
+	 * @return group name or null if not found
+	 */
+	public String getGroupName(int componentId, int groupId);
+
+	/**
+	 * Gets group name with component and group IDs
+	 * 
+	 * @param componentId
+	 *            component ID
+	 * @param groupId
+	 *            group ID
+	 * @param traceId
+	 *            trace ID
+	 * @return trace name or null if not found
+	 */
+	public String getTraceName(int componentId, int groupId, int traceId);
+
+	/**
+	 * Gets list containing component, group and trace names in this order
+	 * 
+	 * @param componentId
+	 *            component ID
+	 * @param groupId
+	 *            group ID
+	 * @param traceId
+	 *            trace ID
+	 * @return list containing component, group and trace name. If some name is
+	 *         not found, it's null
+	 */
+	public String[] getComponentGroupTraceName(int componentId, int groupId,
+			int traceId);
+
+	/**
+	 * Gets trace metadata
+	 * 
+	 * @param information
+	 *            trace information
+	 * @return trace metadata
+	 */
+	public TraceMetaData getTraceMetaData(TraceInformation information);
+
+	/**
+	 * Tells if the model if loaded and valid
+	 * 
+	 * @return true if model is loaded and valid
+	 */
+	public boolean isModelLoadedAndValid();
+
+	/**
+	 * Opens decode file
+	 * 
+	 * @param filePath
+	 *            decode file path. If fileStream is not null, this is only used
+	 *            in error situations to tell the user the name of the file
+	 *            having problems.
+	 * @param inputStream
+	 *            input stream of the decode file. If null, filePath is used to
+	 *            open the file.
+	 * @param createNew
+	 *            true if creating new model. False if appending to old model.
+	 */
+	public void openDecodeFile(String filePath, InputStream inputStream,
+			boolean createNew);
+
+	/**
+	 * Removes component from model
+	 * 
+	 * @param componentId
+	 *            component ID
+	 * @return true if component was found and removed, false otherwise
+	 */
+	public boolean removeComponentFromModel(int componentId);
+
+	/**
+	 * Sets if Decoder should add certain prefixes to the traces
+	 * 
+	 * @param addClassAndFunctionName
+	 *            if true, add class and function name to the traces
+	 * @param addComponentAndGroupName
+	 *            if true, add component and group name to the traces
+	 */
+	public void setAddPrefixesToTrace(boolean addClassAndFunctionName,
+			boolean addComponentAndGroupName);
+
+}