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)
105: throws ObjectFactoryException {
106: if (!(o instanceof Line2D)) {
107: throw new ObjectFactoryException(
108: "The given object is no java.awt.geom.Line2D.");
109: }
110: final Line2D line = (Line2D) o;
111: final float x1 = (float) line.getX1();
112: final float x2 = (float) line.getX2();
113: final float y1 = (float) line.getY1();
114: final float y2 = (float) line.getY2();
115:
116: setParameter("x1", new Float(x1));
117: setParameter("x2", new Float(x2));
118: setParameter("y1", new Float(y1));
119: setParameter("y2", new Float(y2));
120: }
121: }
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