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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2012 Contributors.
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * 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" {@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
     * @param bytes The bytes array - ignored if null/empty
     * @return Calculated CRC
     * @see 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();
    }
}