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jtstand-common is a library derived from jcommon, used by jtstand-chart, which is derived from jfreechart

There is a newer version: 1.5.9

/*
 * Copyright (c) 2009 Albert Kurucz. 
 *
 * This file, DateObjectDescription.java is part of JTStand.
 *
 * JTStand 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 3 of the License, or
 * (at your option) any later version.
 *
 * JTStand 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 GTStand.  If not, see .
 */

package org.jfree.xml.factory.objects;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

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

    /**
     * Creates a new object description.
     */
    public DateObjectDescription() {
        super(Date.class);
        setParameterDefinition("year", Integer.class);
        setParameterDefinition("month", Integer.class);
        setParameterDefinition("day", Integer.class);
    }

    /**
     * Creates an object based on this description.
     *
     * @return The object.
     */
    public Object createObject() {
        final int y = getIntParameter("year");
        final int m = getIntParameter("month");
        final int d = getIntParameter("day");

        return new GregorianCalendar(y, m, d).getTime();
    }

    /**
     * Returns a parameter value as an int.
     *
     * @param param  the parameter name.
     *
     * @return The parameter value.
     */
    private int getIntParameter(final String param) {
        final Integer p = (Integer) getParameter(param);
        if (p == null) {
            return 0;
        }
        return p.intValue();
    }

    /**
     * Sets the parameters of this description object to match the supplied object.
     *
     * @param o  the object (should be an instance of Date).
     *
     * @throws ObjectFactoryException if the object is not an instance of Date.
     */
    public void setParameterFromObject(final Object o) throws ObjectFactoryException {
        if (o instanceof Date) {
            final GregorianCalendar gc = new GregorianCalendar();
            gc.setTime((Date) o);
            final int year = gc.get(Calendar.YEAR);
            final int month = gc.get(Calendar.MONTH);
            final int day = gc.get(Calendar.DAY_OF_MONTH);

            setParameter("year", new Integer(year));
            setParameter("month", new Integer(month));
            setParameter("day", new Integer(day));
        }
        else {
            throw new ObjectFactoryException("Is no instance of java.util.Date");
        }

    }
}