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package org.pcollections;

import java.util.Collection;




/**
 *
 * A static convenience class for creating efficient persistent sets.
 * 

 * This class simply creates MapPSets backed by HashTreePMaps.
 * 
 * @author harold
 */
public final class HashTreePSet {
	// not instantiable (or subclassable):
	private HashTreePSet() {}
	
	private static final MapPSet EMPTY = MapPSet.from(HashTreePMap.empty());

	/**
	 * @param 
	 * @return an empty set
	 */
	@SuppressWarnings("unchecked")
	public static  MapPSet empty() {
		return (MapPSet)EMPTY; }
	
	/**
	 * @param 
	 * @param e
	 * @return empty().plus(e)
	 */
	public static  MapPSet singleton(final E e) {
		return HashTreePSet.empty().plus(e); }
	
	/**
	 * @param 
	 * @param list
	 * @return empty().plusAll(map)
	 */
	public static  MapPSet from(final Collection list) {
		return HashTreePSet.empty().plusAll(list); }
}
    

    

    

            

    

            



    
    






    
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