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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.
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/* ========================================================================
 * 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.]
 * 
 * --------------------
 * URLClassFactory.java
 * --------------------
 * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: URLObjectDescription.java,v 1.3 2005/11/14 11:04:43 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.net.URL;

import org.jfree.io.IOUtils;
import org.jfree.util.Log;
import org.jfree.xml.Parser;

/**
 * An object-description for a URL object.
 *
 * @author Thomas Morgner
 */
public class URLObjectDescription extends AbstractObjectDescription {

    /**
     * Creates a new object description.
     */
    public URLObjectDescription() {
        super(URL.class);
        setParameterDefinition("value", String.class);
    }

    /**
     * Creates an object based on this description.
     *
     * @return The object.
     */
    public Object createObject() {
        final String o = (String) getParameter("value");
        final String baseURL = getConfig().getConfigProperty(Parser.CONTENTBASE_KEY);
        try {
            try {
                final URL bURL = new URL(baseURL);
                return new URL(bURL, o);
            }
            catch (Exception e) {
                Log.warn("BaseURL is invalid: ", e);
            }
            return new URL(o);
        }
        catch (Exception e) {
            return null;
        }
    }

    /**
     * Sets the parameters of this description object to match the supplied object.
     *
     * @param o  the object (should be an instance of URL).
     *
     * @throws ObjectFactoryException if the object is not an instance of URL.
     */
    public void setParameterFromObject(final Object o) throws ObjectFactoryException {
        if (!(o instanceof URL)) {
            throw new ObjectFactoryException("Is no instance of java.net.URL");
        }

        final URL comp = (URL) o;
        final String baseURL = getConfig().getConfigProperty(Parser.CONTENTBASE_KEY);
        try {
            final URL bURL = new URL(baseURL);
            setParameter("value", IOUtils.getInstance().createRelativeURL(comp, bURL));
        }
        catch (Exception e) {
            Log.warn("BaseURL is invalid: ", e);
        }
        setParameter("value", comp.toExternalForm());
    }

}