- // 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 1.1.24.1 2004/05/01 08:34:46 jsuttor 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());
- }
- }
- }