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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * 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.apache.asterix.aql.expression;

import org.apache.asterix.aql.base.Expression;
import org.apache.asterix.aql.expression.visitor.IAqlExpressionVisitor;
import org.apache.asterix.aql.expression.visitor.IAqlVisitorWithVoidReturn;
import org.apache.asterix.common.exceptions.AsterixException;

public class UnaryExpr implements Expression {
    private Sign sign;
    private Expression expr;

    public UnaryExpr() {
    }

    public UnaryExpr(Sign sign, Expression expr) {
        this.sign = sign;
        this.expr = expr;
    }

    public Sign getSign() {
        return sign;
    }

    public void setSign(Sign sign) {
        this.sign = sign;
    }

    public Expression getExpr() {
        return expr;
    }

    public void setExpr(Expression expr) {
        this.expr = expr;
    }

    @Override
    public Kind getKind() {
        return Kind.UNARY_EXPRESSION;
    }

    public enum Sign {
        POSITIVE,
        NEGATIVE
    }

    @Override
    public  void accept(IAqlVisitorWithVoidReturn visitor, T arg) throws AsterixException {
        visitor.visit(this, arg);
    }

    @Override
    public  R accept(IAqlExpressionVisitor visitor, T arg) throws AsterixException {
        return visitor.visitUnaryExpr(this, arg);
    }
}