1 | ' ****************************************************************
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2 | ' This is free software licensed under the NUnit license. You
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3 | ' may obtain a copy of the license as well as information regarding
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4 | ' copyright ownership at http://nunit.org/?p=license&r=2.4.
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5 | ' ****************************************************************
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6 |
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7 | Option Explicit On
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8 |
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9 | Namespace NUnit.Samples
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10 |
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11 | Public Class MoneyBag
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12 | Implements IMoney
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13 |
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14 | Private fmonies As ArrayList = New ArrayList(5)
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15 |
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16 | Private Sub New()
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17 |
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18 | End Sub
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19 |
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20 | Public Sub New(ByVal bag As Money())
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21 | For Each m As Money In bag
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22 | If Not m.IsZero Then
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23 | AppendMoney(m)
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24 | End If
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25 | Next
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26 | End Sub
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27 |
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28 | Public Sub New(ByVal m1 As Money, ByVal m2 As Money)
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29 |
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30 | AppendMoney(m1)
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31 | AppendMoney(m2)
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32 |
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33 | End Sub
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34 |
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35 | Public Sub New(ByVal m As Money, ByVal bag As MoneyBag)
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36 | AppendMoney(m)
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37 | AppendBag(bag)
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38 | End Sub
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39 |
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40 | Public Sub New(ByVal m1 As MoneyBag, ByVal m2 As MoneyBag)
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41 | AppendBag(m1)
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42 | AppendBag(m2)
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43 | End Sub
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44 |
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45 | Public Function Add(ByVal m As IMoney) As IMoney Implements IMoney.Add
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46 | Return m.AddMoneyBag(Me)
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47 | End Function
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48 |
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49 | Public Function AddMoney(ByVal m As Money) As IMoney Implements IMoney.AddMoney
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50 | Return New MoneyBag(m, Me).Simplify
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51 | End Function
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52 |
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53 | Public Function AddMoneyBag(ByVal s As MoneyBag) As IMoney Implements IMoney.AddMoneyBag
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54 | Return New MoneyBag(s, Me).Simplify()
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55 | End Function
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56 |
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57 | Private Sub AppendBag(ByVal aBag As MoneyBag)
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58 | For Each m As Money In aBag.fmonies
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59 | AppendMoney(m)
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60 | Next
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61 | End Sub
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62 |
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63 | Private Sub AppendMoney(ByVal aMoney As Money)
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64 |
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65 | Dim old As Money = FindMoney(aMoney.Currency)
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66 | If old Is Nothing Then
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67 | fmonies.Add(aMoney)
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68 | Return
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69 | End If
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70 | fmonies.Remove(old)
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71 | Dim sum As IMoney = old.Add(aMoney)
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72 | If (sum.IsZero) Then
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73 | Return
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74 | End If
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75 | fmonies.Add(sum)
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76 | End Sub
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77 |
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78 | Private Function Contains(ByVal aMoney As Money) As Boolean
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79 | Dim m As Money = FindMoney(aMoney.Currency)
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80 | Return m.Amount.Equals(aMoney.Amount)
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81 | End Function
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82 |
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83 | Public Overloads Overrides Function Equals(ByVal anObject As Object) As Boolean
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84 | If IsZero Then
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85 | If TypeOf anObject Is IMoney Then
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86 | Dim aMoney As IMoney = anObject
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87 | Return aMoney.IsZero
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88 | End If
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89 | End If
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90 |
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91 | If TypeOf anObject Is MoneyBag Then
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92 | Dim aMoneyBag As MoneyBag = anObject
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93 | If Not aMoneyBag.fmonies.Count.Equals(fmonies.Count) Then
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94 | Return False
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95 | End If
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96 |
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97 | For Each m As Money In fmonies
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98 | If Not aMoneyBag.Contains(m) Then
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99 | Return False
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100 | End If
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101 |
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102 | Return True
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103 | Next
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104 | End If
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105 |
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106 | Return False
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107 | End Function
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108 |
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109 | Private Function FindMoney(ByVal currency As String) As Money
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110 | For Each m As Money In fmonies
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111 | If m.Currency.Equals(currency) Then
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112 | Return m
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113 | End If
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114 | Next
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115 |
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116 | Return Nothing
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117 | End Function
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118 |
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119 | Public Overrides Function GetHashCode() As Int32
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120 | Dim hash As Int32 = 0
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121 | For Each m As Money In fmonies
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122 | hash += m.GetHashCode()
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123 | Next
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124 | Return hash
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125 | End Function
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126 |
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127 | Public ReadOnly Property IsZero() As Boolean Implements IMoney.IsZero
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128 | Get
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129 | Return fmonies.Count.Equals(0)
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130 | End Get
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131 | End Property
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132 |
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133 | Public Function Multiply(ByVal factor As Integer) As IMoney Implements IMoney.Multiply
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134 | Dim result As New MoneyBag
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135 | If Not factor.Equals(0) Then
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136 | For Each m As Money In fmonies
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137 | result.AppendMoney(m.Multiply(factor))
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138 | Next
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139 | End If
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140 | Return result
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141 | End Function
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142 |
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143 | Public Function Negate() As IMoney Implements IMoney.Negate
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144 | Dim result As New MoneyBag
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145 | For Each m As Money In fmonies
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146 | result.AppendMoney(m.Negate())
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147 | Next
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148 | Return result
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149 | End Function
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150 |
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151 | Private Function Simplify() As IMoney
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152 | If fmonies.Count.Equals(1) Then
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153 | Return fmonies(0)
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154 | End If
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155 | Return Me
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156 | End Function
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157 |
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158 |
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159 | Public Function Subtract(ByVal m As IMoney) As IMoney Implements IMoney.Subtract
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160 | Return Add(m.Negate())
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161 | End Function
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162 | End Class
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163 |
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164 | End Namespace
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