--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trace/traceviewer/com.nokia.traceviewer/src/com/nokia/traceviewer/engine/TraceFetcher.java	Wed Jun 23 14:49:59 2010 +0300
@@ -0,0 +1,168 @@
+/*
+ * 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:
+ *
+ * Trace Fetcher gets traces from file to a arraylist and returns it
+ *
+ */
+package com.nokia.traceviewer.engine;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.nokia.traceviewer.engine.DataReader;
+import com.nokia.traceviewer.engine.MediaCallback;
+import com.nokia.traceviewer.engine.TraceProperties;
+import com.nokia.traceviewer.engine.TraceViewerGlobals;
+
+/**
+ * Trace Fetcher gets traces from file to a arraylist and returns it
+ */
+public final class TraceFetcher implements MediaCallback {
+
+	/**
+	 * Max number of traces to get
+	 */
+	private static int MAX_TRACES_TO_GET = TraceViewerGlobals.blockSize * 5;
+
+	/**
+	 * Array to gather traces to
+	 */
+	private List<TraceProperties> traceArray;
+
+	/**
+	 * Tells how many traces to drop from the beginning
+	 */
+	private int tracesToDrop;
+
+	/**
+	 * Tells how many traces to get totally
+	 */
+	private int tracesToGet;
+
+	/**
+	 * Trace count by this far
+	 */
+	private int traceCount;
+
+	/**
+	 * Data reader
+	 */
+	private DataScrollReader dataReader;
+
+	/**
+	 * Constructor
+	 */
+	public TraceFetcher() {
+		traceCount = 0;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.nokia.traceviewer.engine.MediaCallback#processTrace(com.nokia.traceviewer
+	 * .engine.TraceProperties)
+	 */
+	public void processTrace(TraceProperties properties) {
+		traceCount++;
+		int tracesSaved = traceCount - tracesToDrop;
+
+		// Save traces we want to trace array
+		if (traceCount > tracesToDrop && tracesSaved <= tracesToGet) {
+			traceArray.add(properties);
+		}
+	}
+
+	/**
+	 * Starts gathering traces
+	 * 
+	 * @param start
+	 *            start trace
+	 * @param end
+	 *            end trace
+	 * @return the trace array or null if there is no current data reader
+	 */
+	public List<TraceProperties> startGatheringData(int start, int end) {
+		traceArray = null;
+
+		// Check that current data reader exists
+		DataReader currentDataReader = TraceViewerGlobals.getTraceViewer()
+				.getDataReaderAccess().getCurrentDataReader();
+
+		if (currentDataReader != null) {
+
+			// Get the file position having given offset
+			int index = currentDataReader.getFileMap()
+					.getIndexFromOffset(start);
+			long pos = currentDataReader.getFileMap().getItem(index)
+					.longValue();
+			int startTrace = index * TraceViewerGlobals.blockSize;
+
+			// Calculate how many traces to drop from start
+			traceCount = 0;
+			tracesToDrop = start - startTrace;
+			tracesToGet = end - start + 1;
+			if (tracesToGet > MAX_TRACES_TO_GET) {
+				tracesToGet = MAX_TRACES_TO_GET;
+			}
+
+			// Number of blocks
+			int numberOfBlocks = (tracesToGet / TraceViewerGlobals.blockSize);
+
+			// If modulo is not zero, we will need one block more
+			if (tracesToGet % TraceViewerGlobals.blockSize != 0) {
+				numberOfBlocks++;
+			}
+
+			// If We are dropping traces from the first block we are reading, we
+			// might need to take one block more
+			if (numberOfBlocks * TraceViewerGlobals.blockSize - tracesToDrop < tracesToGet) {
+				numberOfBlocks++;
+			}
+
+			traceArray = new ArrayList<TraceProperties>();
+
+			// Create own data reader if it doesn't exist and start it. Put it
+			// to blocking mode.
+			dataReader = TraceViewerGlobals.getTraceViewer()
+					.getDataReaderAccess().startOwnDataReader(dataReader, this,
+							numberOfBlocks, pos, startTrace, true);
+		}
+		return traceArray;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.nokia.traceviewer.engine.MediaCallback#endOfFile(com.nokia.traceviewer
+	 * .engine.DataReader)
+	 */
+	public void endOfFile(DataReader reader) {
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.nokia.traceviewer.engine.MediaCallback#dataHandleChanged()
+	 */
+	public void dataHandleChanged() {
+		if (dataReader != null) {
+			dataReader.shutdown();
+			dataReader = null;
+		}
+	}
+
+}