    001    /* ========================================================================
    002     * JCommon : a free general purpose class library for the Java(tm) platform
    003     * ========================================================================
    004     *
    005     * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
    006     *
    007     * Project Info:  http://www.jfree.org/jcommon/index.html
    008     *
    009     * This library is free software; you can redistribute it and/or modify it
    010     * under the terms of the GNU Lesser General Public License as published by
    011     * the Free Software Foundation; either version 2.1 of the License, or
    012     * (at your option) any later version.
    013     *
    014     * This library is distributed in the hope that it will be useful, but
    015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    017     * License for more details.
    018     *
    019     * You should have received a copy of the GNU Lesser General Public
    020     * License along with this library; if not, write to the Free Software
    021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
    022     * USA.
    023     *
    024     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
    025     * in the United States and other countries.]
    026     *
    027     * ----------------------------
    028     * Line2DObjectDescription.java
    029     * ----------------------------
    030     * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
    031     *
    032     * Original Author:  Thomas Morgner;
    033     * Contributor(s):   David Gilbert (for Object Refinery Limited);
    034     *
    035     * $Id: Line2DObjectDescription.java,v 1.3 2005/11/14 11:02:46 mungady Exp $
    036     *
    037     * Changes (from 19-Feb-2003)
    038     * -------------------------
    039     * 19-Feb-2003 : Added standard header and Javadocs (DG);
    040     * 29-Apr-2003 : Distilled from the JFreeReport project and moved into JCommon
    041     *
    042     */
    043
    044    package org.jfree.xml.factory.objects;
    045
    046    import java.awt.geom.Line2D;
    047
    048    /**
    049     * An object-description for a <code>Line2D</code> object.
    050     *
    051     * @author Thomas Morgner
    052     */
    053    public class Line2DObjectDescription extends AbstractObjectDescription {
    054
    055        /**
    056         * Creates a new object description.
    057         */
    058        public Line2DObjectDescription() {
    059            super(Line2D.class);
    060            setParameterDefinition("x1", Float.class);
    061            setParameterDefinition("x2", Float.class);
    062            setParameterDefinition("y1", Float.class);
    063            setParameterDefinition("y2", Float.class);
    064        }
    065
    066        /**
    067         * Creates an object based on this description.
    068         *
    069         * @return The object.
    070         */
    071        public Object createObject() {
    072            final Line2D line = new Line2D.Float();
    073
    074            final float x1 = getFloatParameter("x1");
    075            final float x2 = getFloatParameter("x2");
    076            final float y1 = getFloatParameter("y1");
    077            final float y2 = getFloatParameter("y2");
    078            line.setLine(x1, y1, x2, y2);
    079            return line;
    080        }
    081
    082        /**
    083         * Returns a parameter value as a float.
    084         *
    085         * @param param  the parameter name.
    086         *
    087         * @return The float value.
    088         */
    089        private float getFloatParameter(final String param) {
    090            final Float p = (Float) getParameter(param);
    091            if (p == null) {
    092                return 0;
    093            }
    094            return p.floatValue();
    095        }
    096
    097        /**
    098         * Sets the parameters of this description object to match the supplied object.
    099         *
    100         * @param o  the object (should be an instance of <code>Line2D</code>).
    101         *
    102         * @throws ObjectFactoryException if the object is not an instance of <code>Line2D</code>.
    103         */
    104        public void setParameterFromObject(final Object o) throws ObjectFactoryException {
    105            if (!(o instanceof Line2D)) {
    106                throw new ObjectFactoryException("The given object is no java.awt.geom.Line2D.");
    107            }
    108            final Line2D line = (Line2D) o;
    109            final float x1 = (float) line.getX1();
    110            final float x2 = (float) line.getX2();
    111            final float y1 = (float) line.getY1();
    112            final float y2 = (float) line.getY2();
    113
    114            setParameter("x1", new Float(x1));
    115            setParameter("x2", new Float(x2));
    116            setParameter("y1", new Float(y1));
    117            setParameter("y2", new Float(y2));
    118        }
    119    }