/*
 * #%L
 * JSQLParser library
 * %%
 * Copyright (C) 2004 - 2013 JSQLParser
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as 
 * published by the Free Software Foundation, either version 2.1 of the 
 * License, or (at your option) any later version.
 * 
 * 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public 
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-2.1.html>.
 * #L%
 */
package net.sf.jsqlparser.expression;

/**
 * A basic class for binary expressions, that is expressions having a left member and a right member
 * which are in turn expressions.
 */
public abstract class BinaryExpression implements Expression {

    private Expression leftExpression;
    private Expression rightExpression;
    private boolean not = false;

    public BinaryExpression() {
    }

    public Expression getLeftExpression() {
        return leftExpression;
    }

    public Expression getRightExpression() {
        return rightExpression;
    }

    public void setLeftExpression(Expression expression) {
        leftExpression = expression;
    }

    public void setRightExpression(Expression expression) {
        rightExpression = expression;
    }

    public void setNot() {
        not = true;
    }

    public boolean isNot() {
        return not;
    }

    @Override
    public String toString() {
        return (not ? "NOT " : "") + getLeftExpression() + " " + getStringExpression() + " " + getRightExpression();
    }

    public abstract String getStringExpression();
}
