v1/test/src/drt/drtcases/TestRunUtil.java

/*
* The Apache Software License, Version 1.1
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*
* Copyright (c) 2003 The Apache Software Foundation.  All rights 
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer. 
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*    if any, must include the following acknowledgment:  
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*    if and wherever such third-party acknowledgments normally appear.
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* This software consists of voluntary contributions made by many
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package drtcases;

import java.io.File;
import java.net.URLClassLoader;
import java.net.URL;
import java.net.MalformedURLException;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;

public class TestRunUtil
{
    /**
     * Runs method that must be declared "static void test()" on the given
     * class, with the given additional jars or directories on the classpath.
     */
    public static void run(String classname, File[] classpath) throws Throwable
    {
        // System.err.println("Running " + classname + " with classpath:");
        for (int i = 0; i < classpath.length; i++)
        {
            // System.err.println(classpath[i]);
            if (!classpath[i].exists())
                throw new IllegalArgumentException("Classpath component " + classpath + " cannot be found!");
        }

        URL[] extracp = new URL[classpath.length];
        for (int i = 0; i < classpath.length; i++)
        {
            try
            {
                extracp[i] = classpath[i].toURL();
            }
            catch (MalformedURLException e)
            {
                throw new IllegalArgumentException("Malformed classpath filename");
            }
        }

        ClassLoader curcl = Thread.currentThread().getContextClassLoader();

        try
        {
            ClassLoader childcl = new URLClassLoader(extracp);
            Class javaClass = childcl.loadClass(classname);
            Class testClass = childcl.loadClass("org.openuri.mytest.CustomerDocument");
            if (testClass == null)
                throw new IllegalStateException();
            Method meth = javaClass.getMethod("test", new Class[0]); // should be static
            Thread.currentThread().setContextClassLoader(childcl);
            meth.invoke(null, new Object[0]);
        }
        catch (ClassNotFoundException e)
        {
            throw new IllegalArgumentException("class not found");
        }
        catch (NoSuchMethodException e)
        {
            throw new IllegalArgumentException("no test() method found");
        }
        catch (IllegalAccessException e)
        {
            throw new IllegalArgumentException("could not invoke static public test method");
        }
        catch (InvocationTargetException e)
        {
            throw e.getCause();
        }
        finally
        {
            Thread.currentThread().setContextClassLoader(curcl);
        }
    }
}