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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) 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);
    }

}