doubleobjectdescription.java

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/* ===================================================
 * JCommon : a free general purpose Java class library
 * ===================================================
 *
 * Project Info:  http://www.jfree.org/jcommon/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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.
 *
 * ----------------------
 * DoubleDescription.java
 * ----------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: DoubleObjectDescription.java,v 1.5 2003/07/24 11:16:11 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>Double</code> object.
 *
 * @author Thomas Morgner
 */
public class DoubleObjectDescription extends AbstractObjectDescription {

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

    /**
     * Creates an object based on this description.
     *
     * @return The object.
     */
    public Object createObject() {
        String o = (String) getParameter("value");
        return Double.valueOf(o);
    }

    /**
     * Sets the parameters of this description object to match the supplied object.
     *
     * @param o  the object (should be an instance of <code>Double</code>).
     *
     * @throws ObjectFactoryException if the object is not an instance of <code>Double</code>.
     */
    public void setParameterFromObject(Object o) throws ObjectFactoryException {
        if (o instanceof Double == false) {
            throw new ObjectFactoryException("The given object is no java.lang.Double.");
        }
        setParameter("value", String.valueOf(o));
    }

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

        final AbstractObjectDescription abstractObjectDescription = (AbstractObjectDescription) o;

        if (Double.TYPE.equals(abstractObjectDescription.getObjectClass())) return true;
        if (Double.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();
    }

}