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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.]
 * 
 * ---------------------------------
 * BasicStrokeObjectDescription.java
 * ---------------------------------
 * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: BasicStrokeObjectDescription.java,v 1.4 2006/01/27 18:53:15 taqua 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.awt.BasicStroke;

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

    /**
     * Creates a new object description.
     */
    public BasicStrokeObjectDescription() {
        super(BasicStroke.class);
        setParameterDefinition("value", String.class);
        setParameterDefinition("width", Float.class);
        setParameterDefinition("dashes", Float[].class);
    }

    /**
     * Returns a parameter as a float.
     *
     * @param param  the parameter name.
     *
     * @return The float value.
     */
    private float getFloatParameter(final String param) {
        final String p = (String) getParameter(param);
        if (p == null) {
            return 0;
        }
        try {
            return Float.parseFloat(p);
        }
        catch (Exception e) {
            return 0;
        }
    }

    /**
     * Creates a new BasicStroke object based on this description.
     *
     * @return The BasicStroke object.
     */
    public Object createObject() {

        final float width = getFloatParameter("value");
        if (width > 0) {
          return new BasicStroke(width);
        }

        Float realWidth = (Float) getParameter("width");
        Float[] dashes = (Float[]) getParameter("dashes");
        if (realWidth == null || dashes == null) {
            return null;
        }
        float[] dashesPrimitive = new float[dashes.length];
        for (int i = 0; i < dashes.length; i++) {
          Float dash = dashes[i];
          dashesPrimitive[i] = dash.floatValue();
        }
        return new BasicStroke(realWidth.floatValue(),
                BasicStroke.CAP_SQUARE, BasicStroke.JOIN_MITER,
                10.0f, dashesPrimitive, 0.0f);
    }

    /**
     * Sets the parameters for this description to match the supplied object.
     *
     * @param o  the object (instance of BasicStroke required).
     *
     * @throws ObjectFactoryException if the supplied object is not an instance of
     *         BasicStroke.
     */
    public void setParameterFromObject(final Object o) throws ObjectFactoryException {
        if (!(o instanceof BasicStroke)) {
            throw new ObjectFactoryException("Expected object of type BasicStroke");
        }
        final BasicStroke bs = (BasicStroke) o;
        setParameter("value", String.valueOf(bs.getLineWidth()));
    }
}