objectfactory.java

这是一个以JAVA编写的程序,本人还没有试过,是一个简单的温度控制系统

package net.sf.dz.util;

/**
 * A simple object factory.
 *
 * @author Copyright &copy; <a href="mailto:[e-mail]">Vadim Tkachenko</a> 2001
 * @version $Id: ObjectFactory.java,v 1.2 2004/06/28 20:35:49 vtt Exp $
 */
public class ObjectFactory {

    /**
     * Try to instantiate the object and check the class it has to be
     * assignable to.
     *
     * <p>
     *
     * Besides the documented exception, this method will throw the
     * exceptions related to <code>Class.forName()</code> and
     * <code>Class.newInstance()</code>.
     *
     * @param className Class name to instantiate.
     *
     * @param template Class the resulting object has to be assignable to.
     *
     * @exception IllegalArgumentException if the result is not assignable
     * to the template class.
     */
    public static Object instantiate(String className, Class template) throws Throwable {
    
        if ( className == null || "".equals(className)) {
        
            throw new IllegalArgumentException("Empty class name specified for " + template.getName());
        }
    
        Class objectClass = Class.forName(className);
        Object theObject = objectClass.newInstance();
        
        if ( template.isInstance(theObject) ) {
        
            return theObject;
        }
        
        throw new IllegalArgumentException("Expected " + template.getName() + ", got " + theObject.getClass().getName());
    }
}