/**
*
Java Diagram Package; An extremely flexible and fast multipurpose diagram
component for Swing.
Copyright (C) 2001 Eric Crahen <crahen@cse.buffalo.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package diagram;
import java.util.NoSuchElementException;
/**
* @class ValueIterator
*
* @date 08-20-2001
* @author Eric Crahen
* @version 1.0
*
* Allows the values for a particular class of Figures to be iterated over, including nulls.
*/
public class ValueIterator extends FigureIterator {
private DiagramModel model;
private Object value;
private boolean haveNext = false;
private boolean includeNulls;
/**
* Create an iterator that will pull values for a a certain class of Figures from the
* given DiagramModel
*
* @param DiagramModel
* @param Class
*/
public ValueIterator(DiagramModel model, Class figureClass) {
this(model, figureClass, true);
}
public ValueIterator(DiagramModel model, Class figureClass, boolean includeNulls) {
super(model, figureClass);
this.model = model;
this.includeNulls = includeNulls;
}
public Object next() {
// Check for the next element
if(!haveNext)
haveNext = hasNext();
if(!haveNext)
throw new NoSuchElementException();
haveNext = false;
return value;
}
public boolean hasNext() {
if(super.hasNext() && !haveNext) {
value = model.getValue((Figure)super.next());
if((!includeNulls && value == null) || includeNulls)
haveNext = true;
}
return haveNext;
}
}