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1 using System;
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2 using System.Linq;
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3 using BLToolkit.Properties;
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4
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5 namespace BLToolkit.Common
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6 {
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7 /// <summary>
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8 /// This argument adapter class allows either names (strings) or
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9 /// indices (ints) to be passed to a function.
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10 /// </summary>
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11 [System.Diagnostics.DebuggerStepThrough]
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12 public struct NameOrIndexParameter
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13 {
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14 public NameOrIndexParameter(string name)
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15 {
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16 if (null == name)
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17 throw new ArgumentNullException("name");
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18
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19 if (name.Length == 0)
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20 throw new ArgumentException(Resources.NameOrIndexParameter_BadName, "name");
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21
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22 _name = name;
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23 _index = 0;
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24 }
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25
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26 public NameOrIndexParameter(int index)
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27 {
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28 if (index < 0)
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29 throw new ArgumentException(Resources.NameOrIndexParameter_BadIndex, "index");
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30
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31 _name = null;
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32 _index = index;
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33 }
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34
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35 public static implicit operator NameOrIndexParameter(string name)
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36 {
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37 return new NameOrIndexParameter(name);
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38 }
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39
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40 public static implicit operator NameOrIndexParameter(int index)
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41 {
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42 return new NameOrIndexParameter(index);
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43 }
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44
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45 #region Public properties
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46
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47 public bool ByName
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48 {
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49 get { return null != _name; }
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50 }
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51
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52 private readonly string _name;
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53 public string Name
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54 {
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55 get
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56 {
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57 if (null == _name)
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58 throw new InvalidOperationException(
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59 "This instance was initialized by index");
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60
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61 return _name;
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62 }
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63 }
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64
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65 private readonly int _index;
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66 public int Index
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67 {
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68 get
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69 {
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70 if (null != _name)
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71 throw new InvalidOperationException(
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72 "This instance was initialized by name");
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73
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74 return _index;
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75 }
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76 }
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77
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78 #endregion
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79
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80 #region Static methods
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81
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82 public static NameOrIndexParameter[] FromStringArray(string[] names)
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83 {
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84 return names.Select(name => new NameOrIndexParameter(name)).ToArray();
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85 }
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86
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87 public static NameOrIndexParameter[] FromIndexArray(int[] indices)
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88 {
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89 return indices.Select(index => new NameOrIndexParameter(index)).ToArray();
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90 }
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91
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92 #endregion
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93
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94 #region System.Object members
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95
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96 public override bool Equals(object obj)
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97 {
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98 if (obj is NameOrIndexParameter)
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99 {
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100 var nip = (NameOrIndexParameter)obj;
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101
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102 if (null != _name && null != nip._name && _name == nip._name)
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103 return true; // Same name
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104
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105 if (null == _name && null == nip._name && _index == nip._index)
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106 return true; // Same index
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107
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108 return false;
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109 }
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110
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111 if (obj is string)
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112 {
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113 var name = (string)obj;
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114 return (null != _name && _name == name);
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115 }
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116
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117 if (obj is int)
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118 {
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119 var index = (int)obj;
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120 return (null == _name && _index == index);
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121 }
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122
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123 return false;
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124 }
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125
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126 public override int GetHashCode()
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127 {
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128 return (null != _name) ? _name.GetHashCode() : _index.GetHashCode();
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129 }
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130
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131 public override string ToString()
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132 {
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133 return _name ?? "#" + _index;
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134 }
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135
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136 #endregion
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137
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138 }
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139 }
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