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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;

/**
 * It represents a "-" or "+" before an expression
 */
public class SignedExpression implements Expression {

	private char sign;
	private Expression expression;

	public SignedExpression(char sign, Expression expression) {
		setSign(sign);
		setExpression(expression);
	}

	public char getSign() {
		return sign;
	}

	public final void setSign(char sign) {
		this.sign = sign;
		if (sign != '+' && sign != '-') {
			throw new IllegalArgumentException("illegal sign character, only + - allowed");
		}
	}

	public Expression getExpression() {
		return expression;
	}

	public final void setExpression(Expression expression) {
		this.expression = expression;
	}


	public void accept(ExpressionVisitor expressionVisitor) {
		expressionVisitor.visit(this);
	}


	public String toString() {
		return getSign() + expression.toString();
	}
}