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package org.aspectj.apache.bcel.util;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import java.lang.reflect.*;
/**
* Java interpreter replacement, i.e., wrapper that uses its own ClassLoader
* to modify/generate classes as they're requested. You can take this as a template
* for your own applications.<br>
* Call this wrapper with
* <pre>java org.aspectj.apache.bcel.util.JavaWrapper <real.class.name> [arguments]</pre>
* <p>
* To use your own class loader you can set the "bcel.classloader" system property
* which defaults to "org.aspectj.apache.bcel.util.ClassLoader", e.g., with
* <pre>java org.aspectj.apache.bcel.util.JavaWrapper -Dbcel.classloader=foo.MyLoader <real.class.name> [arguments]</pre>
* </p>
*
* @version $Id: JavaWrapper.java,v 1.2 2004/11/19 16:45:19 aclement Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
* @see ClassLoader
*/
public class JavaWrapper {
private java.lang.ClassLoader loader;
private static java.lang.ClassLoader getClassLoader() {
String s = System.getProperty("bcel.classloader");
if((s == null) || "".equals(s))
s = "org.aspectj.apache.bcel.util.ClassLoader";
try {
return (java.lang.ClassLoader)Class.forName(s).newInstance();
} catch(Exception e) {
throw new RuntimeException(e.toString());
}
}
public JavaWrapper(java.lang.ClassLoader loader) {
this.loader = loader;
}
public JavaWrapper() {
this(getClassLoader());
}
/** Runs the main method of the given class with the arguments passed in argv
*
* @param class_name the fully qualified class name
* @param argv the arguments just as you would pass them directly
*/
public void runMain(String class_name, String[] argv) throws ClassNotFoundException
{
Class cl = loader.loadClass(class_name);
Method method = null;
try {
method = cl.getMethod("main", new Class[] { argv.getClass() });
/* Method main is sane ?
*/
int m = method.getModifiers();
Class r = method.getReturnType();
if(!(Modifier.isPublic(m) && Modifier.isStatic(m)) ||
Modifier.isAbstract(m) || (r != Void.TYPE))
throw new NoSuchMethodException();
} catch(NoSuchMethodException no) {
System.out.println("In class " + class_name +
": public static void main(String[] argv) is not defined");
return;
}
try {
method.invoke(null, new Object[] { argv });
} catch(Exception ex) {
ex.printStackTrace();
}
}
/** Default main method used as wrapper, expects the fully qualified class name
* of the real class as the first argument.
*/
public static void main(String[] argv) throws Exception {
/* Expects class name as first argument, other arguments are by-passed.
*/
if(argv.length == 0) {
System.out.println("Missing class name.");
return;
}
String class_name = argv[0];
String[] new_argv = new String[argv.length - 1];
System.arraycopy(argv, 1, new_argv, 0, new_argv.length);
JavaWrapper wrapper = new JavaWrapper();
wrapper.runMain(class_name, new_argv);
}
}
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