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1 using System;
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2 using System.Collections;
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3 using System.Collections.Generic;
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4
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5 namespace BLToolkit.Mapping
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6 {
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7 public class DictionaryMapper : MapDataSourceDestinationBase
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8 {
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9 public DictionaryMapper(IDictionary dictionary)
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10 {
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11 if (dictionary == null) throw new ArgumentNullException("dictionary");
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12
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13 _dictionary = dictionary;
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14 }
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15
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16 private readonly IDictionary _dictionary;
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17 public IDictionary Dictionary
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18 {
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19 get { return _dictionary; }
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20 }
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21
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22 private int _currentIndex;
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23 private IDictionaryEnumerator _enumerator;
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24
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25 private void SetEnumerator(int i)
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26 {
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27 if (_enumerator == null)
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28 {
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29 _enumerator = _dictionary.GetEnumerator();
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30 _enumerator.MoveNext();
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31 }
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32
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33 if (_currentIndex > i)
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34 {
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35 _currentIndex = 0;
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36 _enumerator.Reset();
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37 _enumerator.MoveNext();
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38 }
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39
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40 for (; _currentIndex < i; _currentIndex++)
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41 _enumerator.MoveNext();
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42 }
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43
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44 #region IMapDataSource Members
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45
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46 public override int Count
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47 {
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48 get { return _dictionary.Count; }
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49 }
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50
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51 public override Type GetFieldType(int index)
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52 {
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53 SetEnumerator(index);
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54 return _enumerator.Value == null? typeof(object): _enumerator.Value.GetType();
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55 }
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56
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57 public override string GetName(int index)
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58 {
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59 SetEnumerator(index);
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60 return _enumerator.Key.ToString();
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61 }
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62
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63 public override bool SupportsTypedValues(int index)
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64 {
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65 return index < _dictionary.Count;
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66 }
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67
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68 public override object GetValue(object o, int index)
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69 {
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70 SetEnumerator(index);
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71 return _enumerator.Value;
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72 }
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73
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74 public override object GetValue(object o, string name)
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75 {
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76 return _dictionary.Contains(name) ? _dictionary[name] : null;
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77 }
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78
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79 #endregion
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80
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81 #region IMapDataDestination Members
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82
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83 private List<string> _nameList;
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84
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85 public override int GetOrdinal(string name)
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86 {
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87 if (_nameList == null)
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88 _nameList = new List<string>();
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89
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90 var idx = _nameList.IndexOf(name);
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91
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92 if (idx >= 0)
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93 return idx;
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94
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95 _nameList.Add(name);
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96
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97 return _nameList.Count - 1;
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98 }
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99
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100 public override void SetValue(object o, int index, object value)
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101 {
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102 SetValue(o, _nameList[index], value);
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103 }
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104
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105 public override void SetValue(object o, string name, object value)
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106 {
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107 if (_dictionary.Contains(name))
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108 _dictionary[name] = value;
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109 else
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110 _dictionary.Add(name, value);
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111 }
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112
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113 #endregion
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114 }
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115 }
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