/* ===========================================================
 
* JFreeChart : a free chart library for the Java(tm) platform
 
* ===========================================================
 
*
 
* (C) Copyright 2000-2016, by Object Refinery Limited and Contributors.
 
*
 
* Project Info:
  
http://www.jfree.org/jfreechart/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., 51 Franklin Street, Fifth Floor, Boston, MA
  
02110-1301,
 
* USA.
 
*
 
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
 
* Other names may be trademarks of their respective owners.]
 
*
 
* -------------------
 
* TickUnitSource.java
 
* -------------------
 
* (C) Copyright 2003-2016, by Object Refinery Limited.
 
*
 
* Original Author:
  
David Gilbert (for Object Refinery Limited);
 
* Contributor(s):
   
-;
 
*
 
* Changes
 
* -------
 
* 23-Sep-2003 : Version 1 (DG);
 
*
 
*/

package org.jfree.chart.axis;

/**
 
* An interface used by the {@link DateAxis} and {@link NumberAxis} classes to
 
* obtain a suitable {@link TickUnit}.
 
*/

public interface TickUnitSource {

    
/**
     
* Returns the smallest tick unit available in the source that is larger
     
* than {@code unit} or, if there is no larger unit, returns {@code unit}.
     
*
     
* @param unit
  
the unit ({@code null} not permitted).
     
*
     
* @return A tick unit that is larger than the supplied unit.
     
*/

    
public TickUnit getLargerTickUnit(TickUnit unit);

    
/**
     
* Returns the tick unit in the collection that is greater than or equal
     
* to (in size) the specified unit.
     
*
     
* @param unit
  
the unit.
     
*
     
* @return A unit from the collection.
     
*/

    
public TickUnit getCeilingTickUnit(TickUnit unit);

    
/**
     
* Returns the smallest tick unit available in the source that is greater
 

     
* than or equal to the specified size.
  
If there is no such tick unit,
     
* the method should return the largest available tick in the source.
     
*
     
* @param size
  
the size.
     
*
     
* @return A unit from the collection (never {@code null}).
     
*/

    
public TickUnit getCeilingTickUnit(double size);

}