vertexiteratoradapter.java

Java数据结构开发包

/*
  Copyright (c) 1999, 2000 Brown University, Providence, RI
  
                            All Rights Reserved
  
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  documentation for any purpose other than its incorporation into a
  commercial product is hereby granted without fee, provided that the
  above copyright notice appear in all copies and that both that
  copyright notice and this permission notice appear in supporting
  documentation, and that the name of Brown University not be used in
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  without specific, written prior permission.
  
  BROWN UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  FITNESS FOR ANY PARTICULAR PURPOSE.  IN NO EVENT SHALL BROWN
  UNIVERSITY BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
  DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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  PERFORMANCE OF THIS SOFTWARE.
*/

package jdsl.graph.ref;

import jdsl.core.api.*;
import jdsl.graph.api.*;

/**
 * Takes an ObjectIterator known to be iterating over things that  
 * are Vertices, and makes it appear as an VertexIterator.
 *   
 * @version JDSL 2.1.1 
 * @author Mark Handy
 */
public class VertexIteratorAdapter implements VertexIterator {

    private ObjectIterator iter_m;
    public VertexIteratorAdapter( ObjectIterator pi ) {
	iter_m = pi;
    }
    
    public boolean hasNext() { return iter_m.hasNext(); }
    
    public Object nextObject() { return nextVertex(); }
    public Position nextPosition() { return nextVertex(); }
    public Vertex nextVertex() { return (Vertex)iter_m.nextObject(); }

    public Object object() { return vertex(); }
    public Position position() { return vertex(); }
    public Vertex vertex() { return (Vertex)iter_m.object(); }
    
    public Object element() { return vertex().element(); }

    public void reset() { iter_m.reset(); }
    
}