InversionOfControl/Castle.MicroKernel/Util/ReferenceExpressionUtil.cs

   1 // Copyright 2004-2008 Castle Project - http://www.castleproject.org/
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 namespace Castle.MicroKernel.Util
  16 {
  17         using System;
  18
  19         /// <summary>
  20         /// Summary description for ReferenceExpressionUtil.
  21         /// </summary>
  22         public abstract class ReferenceExpressionUtil
  23         {
  24                 public static bool IsReference(String value)
  25                 {
  26                         if (value == null || value.Length <= 3 ||
  27                                 !value.StartsWith("${") || !value.EndsWith("}"))
  28                         {
  29                                 return false;
  30                         }
  31
  32                         return true;
  33                 }
  34
  35                 public static String ExtractComponentKey(String value)
  36                 {
  37                         if (IsReference(value))
  38                         {
  39                                 return value.Substring( 2, value.Length - 3 );
  40                         }
  41
  42                         return null;
  43                 }
  44         }
  45 }