CaseSwitchNode.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    Licensed 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.
//

using System;

namespace Deveel.Data.Sql.Parser {
    class CaseSwitchNode : SqlNode {
        internal CaseSwitchNode() {
        }

        public IExpressionNode WhenExpression { get; private set; }

        public IExpressionNode ThenExpression { get; private set; }

        private bool whenFound;

        protected override ISqlNode OnChildNode(ISqlNode node) {
            if (node is SqlKeyNode && ((SqlKeyNode) node).Text == "WHEN") {
                whenFound = true;
            } else if (node is IExpressionNode) {
                if (whenFound) {
                    WhenExpression = (IExpressionNode) node;
                } else {
                    ThenExpression = (IExpressionNode) node;
                }
            }
            return base.OnChildNode(node);
        }
    }
}