File: MemberExpressionMutator.cs

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#region MIT license
// 
// MIT license
//
// Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// 
#endregion

using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;

using DbLinq.Data.Linq.Sugar.Expressions;

namespace DbLinq.Data.Linq.Sugar.ExpressionMutator.Implementation
{
    internal class MemberExpressionMutator : IMutableExpression
    {
        protected MemberExpression MemberExpression { get; private set; }

        public Expression Mutate(IList<Expression> operands)
        {
            if (MemberExpression.Member is PropertyInfo)
                return Expression.Property(operands[0], (PropertyInfo)MemberExpression.Member);
            if (MemberExpression.Member is FieldInfo)
                return Expression.Field(operands[0], (FieldInfo)MemberExpression.Member);
            throw new Exception();
        }

        public IEnumerable<Expression> Operands
        {
            get 
            {
                yield return MemberExpression.Expression;
            }
        }

        public MemberExpressionMutator(MemberExpression expression)
        {
            MemberExpression = expression;
        }
    }
}