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/**
 *  Copyright (c) 1997-2013, www.tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.gnu.org/licenses/gpl.html
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.tinygroup.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;
	}


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

	public abstract String getStringExpression();
}