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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.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;

public class DefaultTraceFactory extends TraceFactory {

	public final static String ENABLED_PROPERTY = "org.aspectj.tracing.enabled";
	public final static String FILE_PROPERTY = "org.aspectj.tracing.file";

    private boolean tracingEnabled = getBoolean(ENABLED_PROPERTY,false);
    private PrintStream print;

    public DefaultTraceFactory() {
		String filename = System.getProperty(FILE_PROPERTY);
		if (filename != null) {
			File file = new File(filename);
			try {
				print = new PrintStream(new FileOutputStream(file));
			}
			catch (IOException ex) {
	    		if (debug) ex.printStackTrace();
			}
		}
	}

    public boolean isEnabled() {
		return tracingEnabled;
	}

    public Trace getTrace (Class clazz) {
    	DefaultTrace trace = new DefaultTrace(clazz);
    	trace.setTraceEnabled(tracingEnabled);
    	if (print != null) trace.setPrintStream(print);
    	return trace;
    }

}