class/System.Core/System.Linq.jvm/ExpressionValidator.cs

   1 //
   2 // ExpressionValidator.cs
   3 //
   4 // (C) 2008 Mainsoft, Inc. (http://www.mainsoft.com)
   5 // (C) 2008 db4objects, Inc. (http://www.db4o.com)
   6 //
   7 // Permission is hereby granted, free of charge, to any person obtaining
   8 // a copy of this software and associated documentation files (the
   9 // "Software"), to deal in the Software without restriction, including
  10 // without limitation the rights to use, copy, modify, merge, publish,
  11 // distribute, sublicense, and/or sell copies of the Software, and to
  12 // permit persons to whom the Software is furnished to do so, subject to
  13 // the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be
  16 // included in all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  22 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.Linq.Expressions;
  29
  30 namespace System.Linq.jvm {
  31
  32         class ExpressionValidator : ExpressionVisitor
  33         {
  34                 LambdaExpression lambda;
  35
  36                 public ExpressionValidator (LambdaExpression lambda)
  37                 {
  38                         this.lambda = lambda;
  39                 }
  40
  41                 protected override void VisitParameter (ParameterExpression parameter)
  42                 {
  43                         foreach (var param in lambda.Parameters) {
  44                                 if (param.Name == parameter.Name && param != parameter)
  45                                         throw new InvalidOperationException ("Lambda Parameter not in scope");
  46                         }
  47                 }
  48
  49                 public void Validate()
  50                 {
  51                         Visit (lambda);
  52                 }
  53     }
  54 }