/**************************************************************************************
 * Copyright (c) Jonas BonŽr, Alexandre Vasseur. All rights reserved.                 *
 * http://aspectwerkz.codehaus.org                                                    *
 * ---------------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the LGPL license      *
 * a copy of which has been included with this distribution in the license.txt file.  *
 **************************************************************************************/
package org.codehaus.aspectwerkz;

import junit.framework.TestCase;
import org.codehaus.aspectwerkz.exception.WrappedRuntimeException;
import org.codehaus.aspectwerkz.hook.impl.WeavingClassLoader;

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.net.URL;
import java.util.ArrayList;
import java.util.StringTokenizer;

/**
 * Transparently runs TestCase with an embedded online mode Write a JUnit test case and extends WeaverTestCase.
 * 
 * @author <a href="mailto:alex@gnilux.com">Alexandre Vasseur </a>
 */
public class WeavedTestCase extends TestCase {
    /**
     * the test runner that runs the test thru reflection in a weaving ClassLoader
     */
    private static WeaverTestRunner s_runner = new WeaverTestRunner();

    public WeavedTestCase() {
        super();
    }

    public WeavedTestCase(String name) {
        super(name);
    }

    /**
     * Overrides JUnit runBare() to run thru the weaverTestRunner This allow WeaverTestCase to be regular TestCase
     * 
     * @throws java.lang.Throwable
     */
    public void runBare() throws Throwable {
        s_runner.runTest(this.getClass().getName(), getName());
    }

    /**
     * Callback the regulare JUnit runBare()
     * 
     * @throws java.lang.Throwable
     */
    public void runBareAfterWeaving() throws Throwable {
        super.runBare();
    }

    /**
     * Allow to run WeaverTestCase thru a weaving ClassLoader
     */
    public static class WeaverTestRunner {
        /**
         * Weaving classloader
         */
        private WeavingClassLoader cl;

        /**
         * Build weavin classloader with system class path and ext. classloader as parent
         */
        public WeaverTestRunner() {
            try {
                String path = System.getProperty("java.class.path");
                ArrayList paths = new ArrayList();
                StringTokenizer st = new StringTokenizer(path, File.pathSeparator);
                while (st.hasMoreTokens()) {
                    paths.add((new File(st.nextToken())).getCanonicalFile().toURL());
                }
                cl = new WeavingClassLoader((URL[]) paths.toArray(new URL[] {}), ClassLoader.getSystemClassLoader()
                        .getParent());
            } catch (IOException e) {
                throw new WrappedRuntimeException(e);
            }
        }

        /**
         * Runs a single test (testXX) Takes care of not using the weaving class loader is online mode or
         * weavingClassLoader.main() is already used (might fail under JRockit MAPI)
         * 
         * @param testClassName test class
         * @param testMethodName test method
         * @throws java.lang.Throwable
         */
        public void runTest(String testClassName, String testMethodName) throws Throwable {
            // skip test embedded weaving if online mode / weavingClassLoader.main() is already used
            if ((cl.getClass().getClassLoader() == null)
                || (cl.getClass().getClassLoader().getClass().getName().indexOf("hook.impl.Weaving") > 0)) {
                ;
            } else {
                Thread.currentThread().setContextClassLoader(cl); // needed for Aspect loading
            }
            Class testClass = Class.forName(testClassName, true, Thread.currentThread().getContextClassLoader());

            //)cl.loadClass(testClassName);
            Constructor ctor = null;
            Object testInstance = null;
            try {
                // new junit style
                ctor = testClass.getConstructor(new Class[] {});
                testInstance = ctor.newInstance(new Object[] {});
                Method setNameMethod = testClass.getMethod("setExpression", new Class[] {
                    String.class
                });
                setNameMethod.invoke(testInstance, new Object[] {
                    testMethodName
                });
            } catch (NoSuchMethodException e) {
                ctor = testClass.getConstructor(new Class[] {
                    String.class
                });
                testInstance = ctor.newInstance(new Object[] {
                    testMethodName
                });
            }
            Method runAfterWeavingMethod = testClass.getMethod("runBareAfterWeaving", new Class[] {});
            runAfterWeavingMethod.invoke(testInstance, new Object[] {});
        }
    }
}