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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 java.io.PrintStream;

public class DefaultTrace extends AbstractTrace {

	private boolean traceEnabled = false;
	private PrintStream print = System.err;

	public DefaultTrace(Class clazz) {
		super(clazz);
	}

	public boolean isTraceEnabled() {
		return traceEnabled;
	}

	public void setTraceEnabled(boolean b) {
		traceEnabled = b;
	}

	public void enter(String methodName, Object thiz, Object[] args) {
		if (traceEnabled) {
			println(formatMessage(">", tracedClass.getName(), methodName, thiz, args));
		}
	}

	public void enter(String methodName, Object thiz) {
		if (traceEnabled) {
			println(formatMessage(">", tracedClass.getName(), methodName, thiz, null));
		}
	}

	public void exit(String methodName, Object ret) {
		if (traceEnabled) {
			println(formatMessage("<", tracedClass.getName(), methodName, ret, null));
		}
	}

	public void exit(String methodName) {
		if (traceEnabled) {
			println(formatMessage("<", tracedClass.getName(), methodName, null, null));
		}
	}

	public void exit(String methodName, Throwable th) {
		if (traceEnabled) {
			println(formatMessage("<", tracedClass.getName(), methodName, th, null));
		}
	}

	public void event(String methodName, Object thiz, Object[] args) {
		if (traceEnabled) {
			println(formatMessage("-", tracedClass.getName(), methodName, thiz, args));
		}
	}

	public void event(String methodName) {
		if (traceEnabled) {
			println(formatMessage("-", tracedClass.getName(), methodName, null, null));
		}
	}

	public void debug(String message) {
		println(formatMessage("?", message, null));
	}

	public void info(String message) {
		println(formatMessage("I", message, null));
	}

	public void warn(String message, Throwable th) {
		println(formatMessage("W", message, th));
		if (th != null)
			th.printStackTrace();
	}

	public void error(String message, Throwable th) {
		println(formatMessage("E", message, th));
		if (th != null)
			th.printStackTrace();
	}

	public void fatal(String message, Throwable th) {
		println(formatMessage("X", message, th));
		if (th != null)
			th.printStackTrace();
	}

	/**
	 * Template method that allows choice of destination for output
	 *
	 * @param s
	 *            message to be traced
	 */
	protected void println(String s) {
		print.println(s);
	}

	public void setPrintStream(PrintStream printStream) {
		this.print = printStream;
	}

	// private static boolean isTracingEnabled =
	// getBoolean("org.aspectj.weaver.tools.tracing",false);
	//
	// private static boolean getBoolean (String name, boolean def) {
	// String defaultValue = String.valueOf(def);
	// String value = System.getProperty(name,defaultValue);
	// return Boolean.valueOf(value).booleanValue();
	// }

}