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/*
 * Copyright 2001-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 

package org.apache.commons.logging;


import java.io.File;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;


/**
 * 

Wrapper around test cases that need to have a custom class loader * hierarchy assembled. The wrapper is configured by the following * system properties:

*
    *
  • wrapper.hierarchy - Descriptive code describing how * the class loader hierarchy should be assembled: *
      *
    • API - Parent class loader contains * commons-logging-api.jar and child class loader * contains commons-logging.jar. This is like the * default configuration for Tomcat 4.1.
    • *
    • FULL - Parent class loader contains * commons-logging.jar. This is what would happen * if you replaced commons-logging-api.jar with * commons-logging.jar so that you did not need to * include the latter with your application.
    • *
    * The child class loader also unconditionally includes * commons-logging-tests.jar.
  • *
  • wrapper.junit - Fully qualified pathname of the * JUnit JAR file.
  • *
  • wrapper.log4j - Fully qualified pathname of the * Log4J JAR file, which will be placed in whichever class loader * commons-logging.jar is placed in, if specified.
  • *
  • wrapper.target - Fully qualified pathname of the * "target" directory created by the build process. This directory * must contain the commons-logging.jar, * commons-logging-api.jar, and * commons-logging-tests.jar files resulting from the * execution of the compile.tests target.
  • *
  • wrapper.testcase - Fully qualified Java class name * of a TestCase that will ultimately be executed. This class must * exist in the commons-logging-tests.jar file.
  • *
* *

When executed, the system classpath for the wrapper should include * only the wrapper class itself.

* * @author Craig R. McClanahan * @version $Revision: 1.5 $ $Date: 2004/02/28 21:46:45 $ */ public class Wrapper { public static void main(String args[]) { try { // Create variables we will need List parentList = new ArrayList(); List childList = new ArrayList(); URL urls[] = null; // Construct URLs for the various JAR files File target = new File(System.getProperty("wrapper.target")); URL commonsLogging = (new File(target, "commons-logging.jar")).toURL(); URL commonsLoggingApi = (new File(target, "commons-logging-api.jar")).toURL(); URL commonsLoggingTests = (new File(target, "commons-logging-tests.jar")).toURL(); URL junit = (new File(System.getProperty("wrapper.junit"))).toURL(); URL appender = null; URL log4j = null; if (System.getProperty("wrapper.log4j") != null) { log4j = (new File(System.getProperty("wrapper.log4j"))).toURL(); appender = (new File(target, "commons-logging-appender.jar")).toURL(); } // Construct class loader repository lists for supported scenarios if ("API".equals(System.getProperty("wrapper.hierarchy"))) { parentList.add(commonsLoggingApi); childList.add(commonsLogging); if (log4j != null) { childList.add(log4j); childList.add(appender); } } else { // Assumes "FULL" parentList.add(commonsLogging); if (log4j != null) { parentList.add(log4j); childList.add(appender); } } childList.add(commonsLoggingTests); childList.add(junit); // Construt the parent and child class loaders urls = (URL[]) parentList.toArray(new URL[parentList.size()]); ClassLoader parent = new URLClassLoader(urls, ClassLoader.getSystemClassLoader()); urls = (URL[]) childList.toArray(new URL[childList.size()]); ClassLoader child = new URLClassLoader(urls, parent); // Execute the test runner for this TestCase ClassLoader old = Thread.currentThread().getContextClassLoader(); Thread.currentThread().setContextClassLoader(child); Class clazz = child.loadClass("junit.textui.TestRunner"); String params[] = new String[1]; params[0] = System.getProperty("wrapper.testcase"); Method method = clazz.getMethod("main", new Class[] { params.getClass() }); method.invoke(null, new Object[] { params }); Thread.currentThread().setContextClassLoader(old); } catch (Exception e) { System.out.println("Wrapper Exception Occurred: " + e); e.printStackTrace(System.out); System.exit(1); } } }


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