mcs/class/System.Data.Linq/src/DbLinq/Data/Linq/Sugar/ExpressionMutator/Implementation/UnaryExpressionMutator.cs

   1 #region MIT license\r
   2 // \r
   3 // MIT license\r
   4 //\r
   5 // Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne\r
   6 // \r
   7 // Permission is hereby granted, free of charge, to any person obtaining a copy\r
   8 // of this software and associated documentation files (the "Software"), to deal\r
   9 // in the Software without restriction, including without limitation the rights\r
  10 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r
  11 // copies of the Software, and to permit persons to whom the Software is\r
  12 // furnished to do so, subject to the following conditions:\r
  13 // \r
  14 // The above copyright notice and this permission notice shall be included in\r
  15 // all copies or substantial portions of the Software.\r
  16 // \r
  17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r
  18 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r
  19 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r
  20 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r
  21 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r
  22 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\r
  23 // THE SOFTWARE.\r
  24 // \r
  25 #endregion\r
  26 \r
  27 using System;\r
  28 using System.Collections.Generic;\r
  29 using System.Linq.Expressions;\r
  30 using DbLinq.Data.Linq.Sugar.Expressions;\r
  31 \r
  32 namespace DbLinq.Data.Linq.Sugar.ExpressionMutator.Implementation\r
  33 {\r
  34     internal class UnaryExpressionMutator : IMutableExpression\r
  35     {\r
  36         protected UnaryExpression UnaryExpression { get; private set; }\r
  37 \r
  38         public Expression Mutate(IList<Expression> operands)\r
  39         {\r
  40             switch (UnaryExpression.NodeType)\r
  41             {\r
  42                 case ExpressionType.ArrayLength:\r
  43                     return Expression.ArrayLength(operands[0]);\r
  44 \r
  45                 case ExpressionType.Convert:\r
  46                     if (UnaryExpression.Method != null)\r
  47                         return Expression.Convert(operands[0], UnaryExpression.Type, UnaryExpression.Method);\r
  48                     return Expression.Convert(operands[0], UnaryExpression.Type);\r
  49 \r
  50                 case ExpressionType.ConvertChecked:\r
  51                     if (UnaryExpression.Method != null)\r
  52                         return Expression.ConvertChecked(operands[0], UnaryExpression.Type, UnaryExpression.Method);\r
  53                     return Expression.ConvertChecked(operands[0], UnaryExpression.Type);\r
  54 \r
  55                 case ExpressionType.Negate:\r
  56                     if (UnaryExpression.Method != null)\r
  57                         return Expression.Negate(operands[0], UnaryExpression.Method);\r
  58                     return Expression.Negate(operands[0]);\r
  59 \r
  60                 case ExpressionType.NegateChecked:\r
  61                     if (UnaryExpression.Method != null)\r
  62                         return Expression.NegateChecked(operands[0], UnaryExpression.Method);\r
  63                     return Expression.NegateChecked(operands[0]);\r
  64 \r
  65                 case ExpressionType.Not:\r
  66                     if (UnaryExpression.Method != null)\r
  67                         return Expression.Not(operands[0], UnaryExpression.Method);\r
  68                     return Expression.Not(operands[0]);\r
  69 \r
  70                 case ExpressionType.Quote:\r
  71                     return Expression.Quote(operands[0]);\r
  72 \r
  73                 case ExpressionType.TypeAs:\r
  74                     return Expression.TypeAs(operands[0], UnaryExpression.Type);\r
  75 \r
  76                 case ExpressionType.UnaryPlus:\r
  77                     if (UnaryExpression.Method != null)\r
  78                         return Expression.UnaryPlus(operands[0], UnaryExpression.Method);\r
  79                     return Expression.UnaryPlus(operands[0]);\r
  80 \r
  81             }\r
  82             throw new Exception();\r
  83         }\r
  84 \r
  85         public IEnumerable<Expression> Operands\r
  86         {\r
  87             get\r
  88             {\r
  89                 yield return UnaryExpression.Operand;\r
  90             }\r
  91         }\r
  92 \r
  93         public UnaryExpressionMutator(UnaryExpression expression)\r
  94         {\r
  95             UnaryExpression = expression;\r
  96         }\r
  97     }\r
  98 }