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The AspectJ weaver applies aspects to Java classes. It can be used as a Java agent in order to apply load-time weaving (LTW) during class-loading and also contains the AspectJ runtime classes.

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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();
	// }

}