characterobjectdescription.java

JfreeChart 常用图表例子

/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2004, 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 * 
 * -------------------------------
 * CharacterObjectDescription.java
 * -------------------------------
 * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: CharacterObjectDescription.java,v 1.1 2004/07/15 14:58:42 mungady Exp $
 *
 * Changes (from 19-Feb-2003)
 * -------------------------
 * 19-Feb-2003 : Added standard header and Javadocs (DG);
 * 29-Apr-2003 : Destilled from the JFreeReport project and moved into JCommon
 *
 */

package org.jfree.xml.factory.objects;

/**
 * An object-description for a <code>Character</code> object.
 *
 * @author Thomas Morgner
 */
public class CharacterObjectDescription extends AbstractObjectDescription {

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

    /**
     * Creates a new object (<code>Character</code>) based on this description object.
     *
     * @return The <code>Character</code> object.
     */
    public Object createObject() {
        final String o = (String) getParameter("value");
        if (o == null) {
            return null;
        }
        if (o.length() > 0) {
            return new Character(o.charAt(0));
        }
        else {
            return null;
        }
    }

    /**
     * Sets the parameters of this description object to match the supplied object.
     *
     * @param o  the object (should be an instance of <code>Character</code>).
     * @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 instanceof Character)) {
            throw new ObjectFactoryException("The given object is no java.lang.Character.");
        }

        setParameter("value", String.valueOf(o));
    }

    /**
     * Tests for equality.
     * 
     * @param o  the object to test.
     * 
     * @return A boolean.
     */
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof AbstractObjectDescription)) {
            return false;
        }

        final AbstractObjectDescription abstractObjectDescription = (AbstractObjectDescription) o;

        if (Character.TYPE.equals(abstractObjectDescription.getObjectClass())) {
            return true;
        }
        if (Character.class.equals(abstractObjectDescription.getObjectClass())) {
            return true;
        }
        return false;
    }

    /**
     * Returns a hash code for the object.
     * 
     * @return The hash code.
     */
    public int hashCode() {
        return getObjectClass().hashCode();
    }

}