tools/mconfig/Mono.MonoConfig/ConfigBlockNodeHandler.cs

   1 //
   2 // Authors:
   3 //   Marek Habersack (mhabersack@novell.com)
   4 //
   5 // (C) 2007 Novell, Inc
   6 //
   7
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28 using System;
  29 using System.Collections.Generic;
  30 using System.Text;
  31 using System.Xml;
  32 using System.Xml.XPath;
  33
  34 namespace Mono.MonoConfig
  35 {
  36         public class ConfigBlockNodeHandler : IDocumentNodeHandler, IStorageConsumer, IConfigBlockContainer
  37         {
  38                 string name;
  39                 Section requirements;
  40                 string contents;
  41                 Dictionary <string, ConfigBlockBlock> storage;
  42
  43                 public void ReadConfiguration (XPathNavigator nav)
  44                 {
  45                         name = Helpers.GetRequiredNonEmptyAttribute (nav, "name");
  46
  47                         requirements = new Section ();
  48                         Helpers.BuildSectionTree (nav.Select ("requires/section[string-length(@name) > 0]"), requirements);
  49
  50                         XPathNodeIterator iter = nav.Select ("contents/text()");
  51                         StringBuilder sb = new StringBuilder ();
  52
  53                         while (iter.MoveNext ())
  54                                 sb.Append (iter.Current.Value);
  55                         if (sb.Length > 0)
  56                                 contents = sb.ToString ();
  57                 }
  58
  59                 public void StoreConfiguration ()
  60                 {
  61                         AssertStorage ();
  62
  63                         ConfigBlockBlock block = new ConfigBlockBlock (name, requirements, contents);
  64                         if (storage.ContainsKey (name))
  65                                 storage [name] = block; // allow for silent override
  66                         else
  67                                 storage.Add (name, block);
  68
  69                         // Prepare to handle more sections
  70                         requirements = new Section ();
  71                         contents = null;
  72                 }
  73
  74                 public void SetStorage (object storage)
  75                 {
  76                         this.storage = storage as Dictionary <string, ConfigBlockBlock>;
  77                         if (this.storage == null)
  78                                 throw new ApplicationException ("Invalid storage type.");
  79                 }
  80
  81                 public ConfigBlockBlock FindConfigBlock (string name)
  82                 {
  83                         AssertStorage ();
  84
  85                         if (storage.ContainsKey (name))
  86                                 return storage [name];
  87
  88                         return null;
  89                 }
  90
  91                 void AssertStorage ()
  92                 {
  93                         if (storage == null)
  94                                 throw new ApplicationException ("No storage attached");
  95                 }
  96         }
  97 }