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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;

public abstract class TraceFactory {

	public final static String DEBUG_PROPERTY = "org.aspectj.tracing.debug";
	public final static String FACTORY_PROPERTY = "org.aspectj.tracing.factory";
	public final static String DEFAULT_FACTORY_NAME = "default";

    protected static boolean debug = getBoolean(DEBUG_PROPERTY,false);
    private static TraceFactory instance;

    public Trace getTrace (Class clazz) {
    	return instance.getTrace(clazz);
    }

    public static TraceFactory getTraceFactory () {
    	return instance;
    }

    protected static boolean getBoolean(String name, boolean def) {
		String defaultValue = String.valueOf(def);
		String value = System.getProperty(name,defaultValue);
		return Boolean.parseBoolean(value);
	}

	static {

		/*
		 * Allow user to override default behaviour or specify their own factory
		 */
		String factoryName = System.getProperty(FACTORY_PROPERTY);
		if (factoryName != null) try {
			if (factoryName.equals(DEFAULT_FACTORY_NAME)) {
				instance = new DefaultTraceFactory();
			}
			else {
	    		Class factoryClass = Class.forName(factoryName);
	    		instance = (TraceFactory)factoryClass.getDeclaredConstructor().newInstance();
			}
		}
    	catch (Throwable th) {
    		if (debug) th.printStackTrace();
    	}

		/*
		 * Try to load external trace infrastructure using supplied factories
		 */
    	if (instance == null) try {
			{
	    		Class factoryClass = Class.forName("org.aspectj.weaver.tools.Jdk14TraceFactory");
	    		instance = (TraceFactory)factoryClass.getDeclaredConstructor().newInstance();
			}
    	}
    	catch (Throwable th) {
    		if (debug) th.printStackTrace();
    	}

    	/*
		 * Use default trace
		 */
    	if (instance == null) {
    	    instance = new DefaultTraceFactory();
    	}

    	if (debug) System.err.println("TraceFactory.instance=" + instance);
    }

}