Necessities.java

/**
  * This program (working title: MAS Prover) is an automated tableaux prover
  * for epistemic logic (S5n).
  * Copyright (C) 2007  Elske van der Vaart and Gert van Valkenhoef

  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published
  * by the Free Software Foundation.

  * 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.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */

package nl.rug.ai.mas.oops.tableau;

import java.util.*;

public class Necessities {
	private Necessities d_parent;
	private Vector<Match> d_current;

	public Necessities(Necessities parent) {
		d_parent = parent;
		d_current = new Vector<Match>();
	}

	public void add(Match n) {
		d_current.add(n);
	}

	public Vector<Match> apply(Label l) {
		Vector<Match> result = null;
		if (d_parent != null)
			result = d_parent.apply(l);
		else
			result = new Vector<Match>();

		for (Match m : d_current) {
			result.addAll(m.apply(l));
		}
		return result;
	}

	public String toString() {
		String s = new String();
		if (d_parent == null)
			s = "###\n";
		else
			s = d_parent.toString() + "---\n";
		for (Match n : d_current) {
			s += "\t" + n.toString() + "\n";
		}
		return s;
	}
}