mcs/class/System.Runtime.Serialization/System.Xml/XmlDictionary.cs

   1 #if NET_2_0
   2 using System;
   3 using System.Collections;
   4 using System.Collections.Generic;
   5
   6 namespace System.Xml
   7 {
   8         public class XmlDictionary : IXmlDictionary
   9         {
  10                 internal class EmptyDictionary : XmlDictionary
  11                 {
  12                         public static readonly EmptyDictionary Instance =
  13                                 new EmptyDictionary ();
  14
  15                         public EmptyDictionary ()
  16                                 : base (1)
  17                         {
  18                         }
  19                 }
  20
  21                 static XmlDictionary empty = new XmlDictionary (true);
  22
  23                 public static XmlDictionary Empty {
  24                         get { return empty; }
  25                 }
  26
  27                 readonly bool is_readonly;
  28                 Dictionary<string, XmlDictionaryString> dict;
  29                 List<XmlDictionaryString> list;
  30
  31                 public XmlDictionary ()
  32                 {
  33                         dict = new Dictionary<string, XmlDictionaryString> ();
  34                         list = new List<XmlDictionaryString> ();
  35                 }
  36
  37                 public XmlDictionary (int capacity)
  38                 {
  39                         dict = new Dictionary<string, XmlDictionaryString> (capacity);
  40                         list = new List<XmlDictionaryString> (capacity);
  41                 }
  42
  43                 // for static empty.
  44                 private XmlDictionary (bool isReadOnly)
  45                         : this (1)
  46                 {
  47                         is_readonly = isReadOnly;
  48                 }
  49
  50                 public virtual XmlDictionaryString Add (string value)
  51                 {
  52                         if (is_readonly)
  53                                 throw new InvalidOperationException ();
  54                         XmlDictionaryString ret;
  55                         if (dict.TryGetValue (value, out ret))
  56                                 return ret;
  57                         ret = new XmlDictionaryString (this, value, dict.Count);
  58                         dict.Add (value, ret);
  59                         list.Add (ret);
  60                         return ret;
  61                 }
  62
  63                 public bool TryLookup (int key, out XmlDictionaryString result)
  64                 {
  65                         if (key < 0 || dict.Count >= key) {
  66                                 result = null;
  67                                 return false;
  68                         }
  69                         result = list [key];
  70                         return true;
  71                 }
  72
  73                 public bool TryLookup (string value, out XmlDictionaryString result)
  74                 {
  75                         if (value == null)
  76                                 throw new ArgumentNullException ();
  77                         result = dict [value];
  78                         return result != null;
  79                 }
  80
  81                 public bool TryLookup (XmlDictionaryString value,
  82                         out XmlDictionaryString result)
  83                 {
  84                         if (value == null)
  85                                 throw new ArgumentNullException ();
  86                         if (value.Dictionary != this) {
  87                                 result = null;
  88                                 return false;
  89                         }
  90                         for (int i = 0; i < list.Count; i++) {
  91                                 if (object.ReferenceEquals (list [i], value)) {
  92                                         result = value;
  93                                         return true;
  94                                 }
  95                         }
  96                         result = null;
  97                         return false;
  98                 }
  99         }
 100 }
 101 #endif