// NewInstance.java - create a new instance of a class by name.// http://www.saxproject.org// Written by Edwin Goei, edwingo@apache.org// and by David Brownell, dbrownell@users.sourceforge.net// NO WARRANTY!  This class is in the Public Domain.// $Id: NewInstance.java,v 1.1.2.1 2002/12/20 03:50:17 tromey Exp $package org.xml.sax.helpers;import java.lang.reflect.Method;import java.lang.reflect.InvocationTargetException;/** * Create a new instance of a class by name. * * <blockquote> * <em>This module, both source code and documentation, is in the * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em> * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a> * for further information. * </blockquote> * * <p>This class contains a static method for creating an instance of a * class from an explicit class name.  It tries to use the thread's context * ClassLoader if possible and falls back to using * Class.forName(String).</p> * * <p>This code is designed to compile and run on JDK version 1.1 and later * including versions of Java 2.</p> * * @author Edwin Goei, David Brownell * @version 2.0.1 (sax2r2) */class NewInstance {    /**     * Creates a new instance of the specified class name     *     * Package private so this code is not exposed at the API level.     */    static Object newInstance (ClassLoader classLoader, String className)        throws ClassNotFoundException, IllegalAccessException,            InstantiationException    {        Class driverClass;        if (classLoader == null) {            driverClass = Class.forName(className);        } else {            driverClass = classLoader.loadClass(className);        }        return driverClass.newInstance();    }    /**     * Figure out which ClassLoader to use.  For JDK 1.2 and later use     * the context ClassLoader.     */               static ClassLoader getClassLoader ()    {        Method m = null;        try {            m = Thread.class.getMethod("getContextClassLoader", null);        } catch (NoSuchMethodException e) {            // Assume that we are running JDK 1.1, use the current ClassLoader            return NewInstance.class.getClassLoader();        }        try {            return (ClassLoader) m.invoke(Thread.currentThread(), null);        } catch (IllegalAccessException e) {            // assert(false)            throw new UnknownError(e.getMessage());        } catch (InvocationTargetException e) {            // assert(e.getTargetException() instanceof SecurityException)            throw new UnknownError(e.getMessage());        }    }}