InnermostWhereFinder.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;
using System.Linq.Expressions;

namespace Deveel.Data.Linq {
    class InnermostWhereFinder : ExpressionVisitor {
        private MethodCallExpression innermostWhereExpression;

        public MethodCallExpression GetInnermostWhere(Expression expression) {
            Visit(expression);
            return innermostWhereExpression;
        }

        protected override Expression VisitMethodCall(MethodCallExpression expression) {
            if (expression.Method.Name == "Where")
                innermostWhereExpression = expression;

            Visit(expression.Arguments[0]);

            return expression;
        }
    }
}