1 /*

     2  * Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies). 

     3  * All rights reserved.

     4  * This component and the accompanying materials are made available

     5  * under the terms of "Eclipse Public License v1.0"

     6  * which accompanies this distribution, and is available

     7  * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8  *

     9  * Initial Contributors:

    10  * Nokia Corporation - initial contribution.

    11  *

    12  * Contributors:

    13  *

    14  * Description:

    15  *

    16  * Internal Trace File Handler

    17  *

    18  */

    19 package com.nokia.traceviewer.engine;

    20 

    21 import java.io.FileNotFoundException;

    22 import java.io.IOException;

    23 import java.io.RandomAccessFile;

    24 import java.nio.channels.FileChannel;

    25 

    26 /**

    27  * Internal Trace File Handler

    28  * 

    29  */

    30 final class InternalFileHandler implements TraceFileHandler {

    31 

    32 	/**

    33 	 * File path

    34 	 */

    35 	private final String filePath;

    36 

    37 	/**

    38 	 * Trace File

    39 	 */

    40 	private RandomAccessFile file;

    41 

    42 	/**

    43 	 * Constructor

    44 	 * 

    45 	 * @param filePath

    46 	 *            trace file path

    47 	 */

    48 	public InternalFileHandler(String filePath) {

    49 		this.filePath = filePath;

    50 	}

    51 

    52 	/*

    53 	 * (non-Javadoc)

    54 	 * 

    55 	 * @see com.nokia.traceviewer.engine.TraceFileHandler#clearFile()

    56 	 */

    57 	public void clearFile() {

    58 		if (file != null) {

    59 			try {

    60 				file.setLength(0);

    61 			} catch (IOException e) {

    62 				e.printStackTrace();

    63 			}

    64 		}

    65 	}

    66 

    67 	/*

    68 	 * (non-Javadoc)

    69 	 * 

    70 	 * @see com.nokia.traceviewer.engine.TraceFileHandler#openFile()

    71 	 */

    72 	public void openFile() {

    73 		if (filePath != null) {

    74 			// Create new RandomAccessFile

    75 			try {

    76 				if (getChannel() == null || !getChannel().isOpen()) {

    77 					this.file = new RandomAccessFile(filePath, "rw"); //$NON-NLS-1$

    78 				}

    79 			} catch (FileNotFoundException e) {

    80 				e.printStackTrace();

    81 			}

    82 		}

    83 	}

    84 

    85 	/*

    86 	 * (non-Javadoc)

    87 	 * 

    88 	 * @see com.nokia.traceviewer.engine.TraceFileHandler#closeFile()

    89 	 */

    90 	public void closeFile() {

    91 		if (file != null) {

    92 			try {

    93 				file.close();

    94 			} catch (IOException e) {

    95 				e.printStackTrace();

    96 			}

    97 		}

    98 	}

    99 

   100 	/**

   101 	 * Gets file channel

   102 	 * 

   103 	 * @return file channel

   104 	 */

   105 	private FileChannel getChannel() {

   106 		FileChannel channel = null;

   107 		if (file != null) {

   108 			channel = file.getChannel();

   109 		}

   110 		return channel;

   111 	}

   112 }