    001/* ===========================================================
    002 * JFreeChart : a free chart library for the Java(tm) platform
    003 * ===========================================================
    004 *
    005 * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
    006 *
    007 * Project Info:  http://www.jfree.org/jfreechart/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 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
    025 * Other names may be trademarks of their respective owners.]
    026 *
    027 * -------------------
    028 * TickUnitSource.java
    029 * -------------------
    030 * (C) Copyright 2003-2008, by Object Refinery Limited.
    031 *
    032 * Original Author:  David Gilbert (for Object Refinery Limited);
    033 * Contributor(s):   -;
    034 *
    035 * Changes
    036 * -------
    037 * 23-Sep-2003 : Version 1 (DG);
    038 *
    039 */
    040
    041package org.jfree.chart.axis;
    042
    043/**
    044 * An interface used by the {@link DateAxis} and {@link NumberAxis} classes to
    045 * obtain a suitable {@link TickUnit}.
    046 */
    047public interface TickUnitSource {
    048
    049    /**
    050     * Returns a tick unit that is larger than the supplied unit.
    051     *
    052     * @param unit   the unit.
    053     *
    054     * @return A tick unit that is larger than the supplied unit.
    055     */
    056    public TickUnit getLargerTickUnit(TickUnit unit);
    057
    058    /**
    059     * Returns the tick unit in the collection that is greater than or equal
    060     * to (in size) the specified unit.
    061     *
    062     * @param unit  the unit.
    063     *
    064     * @return A unit from the collection.
    065     */
    066    public TickUnit getCeilingTickUnit(TickUnit unit);
    067
    068    /**
    069     * Returns the tick unit in the collection that is greater than or equal
    070     * to the specified size.
    071     *
    072     * @param size  the size.
    073     *
    074     * @return A unit from the collection.
    075     */
    076    public TickUnit getCeilingTickUnit(double size);
    077
    078}