/* ========================================================================
* JCommon : a free general purpose class library for the Java(tm) platform
* ========================================================================
*
* (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jcommon/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ---------------------------------
* ClassLoaderObjectDescription.java
* ---------------------------------
* (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
*
* Original Author: Thomas Morgner;
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* $Id: ClassLoaderObjectDescription.java,v 1.5 2005/11/14 11:01:04 mungady Exp $
*
* Changes (from 19-Feb-2003)
* -------------------------
* 19-Feb-2003 : Added standard header and Javadocs (DG);
* 29-Apr-2003 : Distilled from the JFreeReport project and moved into JCommon
*
*/
package org.jfree.xml.factory.objects;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import org.jfree.util.ObjectUtilities;
/**
* An object-description for a class loader.
*
* @author Thomas Morgner
*/
public class ClassLoaderObjectDescription extends AbstractObjectDescription {
/**
* Creates a new object description.
*/
public ClassLoaderObjectDescription() {
super(Object.class);
setParameterDefinition("class", String.class);
}
/**
* Creates an object based on this object description.
*
* @return The object.
*/
public Object createObject() {
try {
final String o = (String) getParameter("class");
return ObjectUtilities.getClassLoader(getClass()).loadClass(o).newInstance();
}
catch (Exception e) {
return null;
}
}
/**
* Sets the parameters of the object description to match the supplied object.
*
* @param o the object.
*
* @throws ObjectFactoryException if there is a problem while reading the
* properties of the given object.
*/
public void setParameterFromObject(final Object o) throws ObjectFactoryException {
if (o == null) {
throw new ObjectFactoryException("The Object is null.");
}
try {
final Constructor c = o.getClass().getConstructor(new Class[0]);
if (!Modifier.isPublic(c.getModifiers())) {
throw new ObjectFactoryException
("The given object has no public default constructor. [" + o.getClass() + "]");
}
setParameter("class", o.getClass().getName());
}
catch (Exception e) {
throw new ObjectFactoryException
("The given object has no default constructor. [" + o.getClass() + "]", e);
}
}
}