Copyright (c) 2012 Contributors.
All rights reserved.
This program and the accompanying materials are made available
under the terms of the Eclipse Public License v1.0
which accompanies this distribution and is available at
http://eclipse.org/legal/epl-v10.html
Contributors:
  John Kew (vmware)         	initial implementation
  Lyor Goldstein (vmware)	add support for weaved class being re-defined
/*******************************************************************************
 * Copyright (c) 2012 Contributors.
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution and is available at
 * http://eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   John Kew (vmware)         	initial implementation
 *   Lyor Goldstein (vmware)	add support for weaved class being re-defined
 *******************************************************************************/
package org.aspectj.weaver.tools.cache;

import java.util.zip.CRC32;

import org.aspectj.weaver.tools.Trace;
import org.aspectj.weaver.tools.TraceFactory;

Basic "common" CacheBacking implementation /**
 * Basic "common" {@link CacheBacking} implementation
 */
public abstract class AbstractCacheBacking implements CacheBacking {
    protected final Trace  logger=TraceFactory.getTraceFactory().getTrace(getClass());

	protected AbstractCacheBacking () {
		super();
	}

    
Calculates CRC32 on the provided bytes
Params:
bytes – The bytes array - ignored if null/empty
See Also:
CRC32
Returns:
Calculated CRC/**
     * Calculates CRC32 on the provided bytes
     * @param bytes The bytes array - ignored if <code>null</code>/empty
     * @return Calculated CRC
     * @see {@link CRC32}
     */
    public static final long crc (byte[] bytes) {
        if ((bytes == null) || (bytes.length <= 0)) {
            return 0L;
        }

        CRC32   crc32=new CRC32();
        crc32.update(bytes);
        return crc32.getValue();
    }
}