001/*
002 * Copyright (c) 2005 Einar Pehrson <einar@pehrson.nu>.
003 *
004 * This file is part of
005 * CleanSheets - a spreadsheet application for the Java platform.
006 *
007 * CleanSheets is free software; you can redistribute it and/or modify
008 * it under the terms of the GNU General Public License as published by
009 * the Free Software Foundation; either version 2 of the License, or
010 * (at your option) any later version.
011 *
012 * CleanSheets is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015 * GNU General Public License for more details.
016 *
017 * You should have received a copy of the GNU General Public License
018 * along with CleanSheets; if not, write to the Free Software
019 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
020 */
021package csheets.core.formula;
022
023import java.io.Serializable;
024
025import csheets.core.Value;
026
027/**
028 * An operator in a formula.
029 * @author Einar Pehrson
030 */
031public interface Operator extends Serializable {
032
033        /**
034         * Returns the operator's string identirifer.
035         * @return a string representation of the operator.
036         */
037        public String getIdentifier();
038
039        /**
040         * Returns the type of value that the operator's operands can have.
041         * @return the type of value that the operator's operands can have
042         */
043        public Value.Type getOperandValueType();
044}