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 csheets.core.Value;
024import csheets.core.formula.util.ExpressionVisitor;
025
026/**
027 * A literal value in a formula.
028 * @author Einar Pehrson
029 */
030public class Literal implements Expression {
031
032        /** The unique version identifier used for serialization */
033        private static final long serialVersionUID = 7854180857828149858L;
034
035        /** The value of the literal */
036        private Value value;
037
038        /**
039         * Creates a new literal.
040         * @param value the value of literal
041         */
042        public Literal(Value value) {
043                this.value = value;
044        }
045
046        public Value evaluate() {
047                return value;
048        }
049
050        /**
051         * Returns the value of the literal.
052         * @return the value of the literal
053         */
054        public Value getValue() {
055                return value;
056        }
057
058        public Object accept(ExpressionVisitor visitor) {
059                return visitor.visitLiteral(this);
060        }
061
062        public String toString() {
063                if (value.getType() == Value.Type.TEXT
064                 || value.getType() == Value.Type.DATE)
065                        return "\"" + value.toString() + "\"";
066                else
067                        return value.toString();
068        }
069}