| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| package com.sun.org.apache.bcel.internal.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 com.sun.org.apache.bcel.internal.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 "com.sun.org.apache.bcel.internal.util.ClassLoader", e.g., with |
| * <pre>java com.sun.org.apache.bcel.internal.util.JavaWrapper -Dbcel.classloader=foo.MyLoader <real.class.name> [arguments]</pre> |
| * </p> |
| * |
| * @version $Id: JavaWrapper.java,v 1.3 2007-07-19 04:34:52 ofung 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 = SecuritySupport.getSystemProperty("bcel.classloader"); |
| |
| if((s == null) || "".equals(s)) |
| s = "com.sun.org.apache.bcel.internal.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); |
| } |
| } |