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This library was originally developed by people listed at http://jpaul.sourceforge.net.

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// MapSetRelationFactory.java, created Mon Jul  4 09:24:08 2005 by salcianu
// Copyright (C) 2005 Alexandru Salcianu 
// Licensed under the Modified BSD Licence; see COPYING for details.
package jpaul.DataStructs;

import java.util.Set;

/**
 * MapSetRelationFactory generates
 * MapSetRelations that use a specific
 * MapFactory and a specific SetFactory.
 *
 * @see MapSetRelation
 * 
 * @author  Alexandru Salcianu - [email protected]
 * @version $Id: MapSetRelationFactory.java,v 1.9 2006/03/14 02:29:31 salcianu Exp $ */
class MapSetRelationFactory extends RelationFactory {
    
    /** Default constructor: creates a
        MapSetRelationFactory based on a
        HashMap factory and a
	HashSet factory.

	@see #MapSetRelationFactory(MapFactory, SetFactory) 
	@see jpaul.DataStructs.SetFacts#hash() SetFacts.hash()
	@see jpaul.DataStructs.MapFacts#hash() MapFacts.hash() */
    public MapSetRelationFactory() {
	this(MapFacts.>hash(), SetFacts.hash());
    }

    /** Creates a MapSetRelationFactory that will
        generate MapSetRelations that use the map factory
        mapFact and the set factory setFact.
        This constructor allows the programmer to finely tune the kind
        of relation that he wants.  */
    public MapSetRelationFactory(MapFactory> mapFact, SetFactory setFact) {
	this.mapFact = mapFact;
	this.setFact = setFact;
    }

    private final MapFactory> mapFact;
    private final SetFactory setFact;

    public Relation create() {
	return new MapSetRelation(mapFact, setFact);
    }
    
    public Relation create(Relation r) {
	if(r instanceof MapSetRelation/**/) {
	    MapSetRelation msr = (MapSetRelation) r;
	    return msr.clone();
	}
	return super.create(r);
    }
    
}