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The AspectJ matcher can be used for matching pointcuts independently of any AspectJ compilation or weaving steps. Most notably, this can be used by frameworks such as Spring AOP which utilise the @AspectJ pointcut syntax but implement aspect weaving in a way independent of AspectJ, e.g. using dynamic proxies.

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/*******************************************************************************
 * Copyright (c) 2006 IBM Corporation and others.
 * 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:
 *     Matthew Webster - initial implementation
 *******************************************************************************/
package org.aspectj.weaver.tools;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class CommonsTrace extends AbstractTrace {

	private Log log;
	private String className;

	public CommonsTrace (Class clazz) {
		super(clazz);
		this.log = LogFactory.getLog(clazz);
		this.className = tracedClass.getName();
	}

	public void enter(String methodName, Object thiz, Object[] args) {
		if (log.isDebugEnabled()) {
			log.debug(formatMessage(">", className, methodName, thiz, args));
		}
	}

	public void enter(String methodName, Object thiz) {
		if (log.isDebugEnabled()) {
			log.debug(formatMessage(">", className, methodName, thiz, null));
		}
	}

	public void exit(String methodName, Object ret) {
		if (log.isDebugEnabled()) {
			log.debug(formatMessage("<", className, methodName, ret, null));
		}
	}

	public void exit(String methodName, Throwable th) {
		if (log.isDebugEnabled()) {
			log.debug(formatMessage("<", className, methodName, th, null));
		}
	}

	public void exit(String methodName) {
		if (log.isDebugEnabled()) {
			log.debug(formatMessage("<", className, methodName, null, null));
		}
	}

	public void event(String methodName, Object thiz, Object[] args) {
		if (log.isDebugEnabled()) {
			log.debug(formatMessage("-", className, methodName, thiz, args));
		}
	}

	public void event(String methodName) {
		if (log.isDebugEnabled()) {
			log.debug(formatMessage("-", className, methodName, null, null));
		}
	}

	public boolean isTraceEnabled () {
		return log.isDebugEnabled();
	}

	public void setTraceEnabled (boolean b) {
	}

	public void debug (String message) {
		if (log.isDebugEnabled()) {
			log.debug(message);
		}
	}

	public void info(String message) {
		if (log.isInfoEnabled()) {
			log.info(message);
		}
	}

	public void warn (String message, Throwable th) {
		if (log.isWarnEnabled()) {
			log.warn(message,th);
		}
	}

	public void error (String message, Throwable th) {
		if (log.isErrorEnabled()) {
			log.error(message,th);
		}
	}

	public void fatal (String message, Throwable th) {
		if (log.isFatalEnabled()) {
			log.fatal(message,th);
		}
	}

}