org.xml.sax.helpers.NewInstance Maven / Gradle / Ivy

// NewInstance.java - create a new instance of a class by name.
// http://www.saxproject.org
// Written by Edwin Goei, [email protected]
// and by David Brownell, [email protected]
// NO WARRANTY!  This class is in the Public Domain.
// $Id: NewInstance.java,v 1.4 2002/01/30 20:52:27 dbrownell Exp $

package org.xml.sax.helpers;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Create a new instance of a class by name.
 *
 * 
 * This module, both source code and documentation, is in the
 * Public Domain, and comes with NO WARRANTY.
 * See http://www.saxproject.org
 * for further information.
 * 
 *
 * 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).
 *
 * This code is designed to compile and run on JDK version 1.1 and later
 * including versions of Java 2.
 *
 * @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");
        } 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());
        } catch (IllegalAccessException e) {
            // assert(false)
            throw new UnknownError(e.getMessage());
        } catch (InvocationTargetException e) {
            // assert(e.getTargetException() instanceof SecurityException)
            throw new UnknownError(e.getMessage());
        }
    }
}