/*

 * 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:

 *

 * Decode Utils

 *

 */

package com.nokia.trace.dictionary.model.decodeparameters;

import java.nio.ByteBuffer;

/**

 * Decode Utils

 * 

 */

final class DecodeUtils {

	/**

	 * Prevents construction

	 */

	private DecodeUtils() {

	}

	/**

	 * Gets integer from buffer

	 * 

	 * @param buffer

	 *            dataBuffer

	 * @param offset

	 *            offset of the data

	 * @param size

	 *            size of the data

	 * @return integer read from buffer

	 */

	static int getIntegerFromBuffer(ByteBuffer buffer, int offset, int size) {

		int data = 0;

		try {

			if (size == 1) {

				data |= buffer.get(offset);

			} else if (size == 2) {

				data |= buffer.getShort(offset) & 0xFFFF;

				data = Short.reverseBytes((short) data);

			} else if (size == 4) {

				data = buffer.getInt(offset);

				data = Integer.reverseBytes(data);

			}

		} catch (Exception e) {

			e.printStackTrace();

		}

		return data;

	}

	/**

	 * Gets long from buffer

	 * 

	 * @param buffer

	 *            dataBuffer

	 * @param offset

	 *            offset of the data

	 * @param size

	 *            size of the data

	 * @return long read from buffer

	 */

	static long getLongFromBuffer(ByteBuffer buffer, int offset, int size) {

		long data = 0;

		try {

			if (size == 1) {

				data |= buffer.get(offset) & 0xFF;

			} else if (size == 2) {

				data |= buffer.getShort(offset) & 0xFFFF;

				data = Short.reverseBytes((short) data);

			} else if (size == 4) {

				data = buffer.getInt(offset);

				data = Integer.reverseBytes((int) data);

			} else if (size == 8) {

				data |= buffer.getLong(offset) & 0xFFFFFFFFFFFFFFFFL;

				data = Long.reverseBytes(data);

			}

		} catch (Exception e) {

			e.printStackTrace();

		}

		return data;

	}

}