Moto

${
	/* Subtracts the elements of set B from set A */

	Stringset subtract(Stringset A, Stringset B)
	{
		Stringset result = new Stringset();
		Enumeration e;

		for(e=A.elements(); e.hasNext();)
			result.add(<String>e.next());
		for(e=B.elements(); e.hasNext();)
			result.remove(<String>e.next());

		return result;
	}

	/* Returns the Union of the elements of set B and set A */

	Stringset union(Stringset A, Stringset B)
	{
		Stringset result = new Stringset();
		Enumeration e;

		for(e=A.elements(); e.hasNext();)
			result.add(<String>e.next());
		for(e=B.elements(); e.hasNext();)
			result.add(<String>e.next());

		return result;
	}

	/* Takes a pipe delimited String of ids and converts it to a Stringset */

	Stringset deSerializeSet(String ids)
	{
		String curID;
		Stringset result = new Stringset();
		Tokenizer tok = new Tokenizer(ids,'|');

		while((curID = tok.next())!=null )
			result.add(curID);

		return result;
	}

	/* Takes a Stringset and serializes it to a pipe delimited String */

	String serializeSet(Stringset A)
	{
		StringBuffer result = new StringBuffer();
		Enumeration e;
		for(e=A.elements(); e.hasNext();) {
			result.append(<String>e.next());
			result.append('|');
		}
		return result.toString();
	}

	/* Takes a query that selects a single String and builds a Stringset out of it */

	Stringset selectSet (String query)
	{
		Stringset result = new Stringset();
		rset = conn.query(query);
		while(rset.next())
			result.add(rset.getString(0));
		return result;
	}

}$