/*

 * 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:

 *

 * FileMap class

 *

 */

package com.nokia.traceviewer.engine;

import java.util.ArrayList;

import java.util.List;

/**

 * Hold information about trace block positions in file

 * 

 */

public class FileMap {

	/**

	 * Map which holds the file pointers to messages

	 */

	private final List<Long> map;

	/**

	 * Constructor

	 */

	public FileMap() {

		map = new ArrayList<Long>();

	}

	/**

	 * Insert item to map

	 * 

	 * @param item

	 *            item

	 */

	public void insert(Long item) {

		map.add(item);

	}

	/**

	 * Gets item from map

	 * 

	 * @param index

	 *            index of item

	 * @return item

	 */

	public Long getItem(int index) {

		long item = 0;

		if (index < 0) {

			item = 0;

		} else if (index > map.size() - 1) {

			item = 0;

		} else {

			item = map.get(index).longValue();

		}

		return Long.valueOf(item);

	}

	/**

	 * Gets index from map from specific offset

	 * 

	 * @param offset

	 *            offset of item

	 * @return index

	 */

	public int getIndexFromOffset(int offset) {

		int index = (offset / TraceViewerGlobals.blockSize);

		return index;

	}

	/**

	 * Empties map

	 */

	public void clearMap() {

		map.clear();

	}

	/**

	 * Gets size of this map

	 * 

	 * @return size

	 */

	public int size() {

		return map.size();

	}

}