source: trunk/Include/Classes/System/Collections/Generic/Dictionary.ab@ 490

'Classes/System/Collections/Generic/Dictionary.ab

'#require <Classes/System/Collections/Generic/EqualityComparer.ab>

Namespace System
Namespace Collections
Namespace Generic

Namespace Detail
    Class Pair
    Public
        Sub Pair(key As Object, value As Object)
            Key = key
            Value = value
        End Sub

        Key As Object
        Value As Object
    End Class
End Namespace 'Detail

Class Dictionary<Key, T>
Public
    'Constructor
    Sub Dictionary()
        initialize(23)
    End Sub
'   Sub Dictionary(d As IDictionary<Key, T>)
'   Sub Dictionary(comparer As IEqualityComparer<Key>)
    Sub Dictionary(capacity As Long)
        initialize(capacity)
    End Sub
'   Sub Dictionary(d As IDictionary<Key, T>, comparer As IEqualityComparer<Key>)
'   Sub Dictionary(capacity As Long, comparer As IEqualityComparer<Key>)

    'Properties
'   Function Comparer() As IEqualityComparer<Key>
'   Virtual Function Count() As Long
'   End Function

    Virtual Function Item(key As Key) As T
        If Object.ReferenceEquals(key, Nothing) Then
            Throw New ArgumentNullException("key")
        End If

        Dim hash = getHash(key)
        Dim a = al[hash] As ArrayList

        If Not Object.ReferenceEquals(a, Nothing) Then
            Dim i As Long
            For i = 0 To ELM(a.Count)
                Dim pair = a[i] As Detail.Pair
                If pair.Key.Equals(key) Then
                    Return pair.Value
                End If
            Next
        End If

        Throw New KeyNotFoundException
    End Function

    Virtual Sub Item(key As Key, value As T)
        If Object.ReferenceEquals(key, Nothing) Then
            'Throw ArgumentNullError
            Exit Sub
        End If

        Dim hash = getHash(key)
        Dim a = al[hash] As ArrayList

        If Object.ReferenceEquals(a, Nothing) Then
            a = New ArrayList
            al[hash] = a
        Else
            Dim i As Long
            For i = 0 To ELM(a.Count)
                Dim pair = a[i] As Detail.Pair
                If pair.Key.Equals(key) Then
                    pair.Value = value
                End If
            Next
        End If

        a.Add(New Detail.Pair(key, value))
    End Sub

'   Function Keys() As KeyCollection
'   Function Values() As ValuesCollection
/*
    'Operators
'   Function Operator [](key As Key) As T
    Function Operator [](key As Key) As Object
        Return Item[key]
    End Function

    Sub Operator []=(key As Key, value As T)
'       Item[key] = vaule
    End Sub
*/
    'Methods
    Sub Add(key As Key, value As T)
        If Object.ReferenceEquals(key, Nothing) Then
            'Throw ArgumentNullError
            Exit Sub
        End If

        Dim hash = getHash(key)
        Dim a = al[hash] As ArrayList

        If Object.ReferenceEquals(a, Nothing) Then
            a = New ArrayList
            al[hash] = a
        Else
            Dim i As Long
            For i = 0 To ELM(a.Count)
                Dim pair = a[i] As Detail.Pair
                If pair.Key.Equals(key) Then
                    'Throw ArgumentError
                End If
            Next
        End If

        a.Add(New Detail.Pair(key, value))

        count++
    End Sub

    Sub Clear()
        Dim i As Long
        For i = 0 To ELM(al.Count)
            al[i] = Nothing
        Next
    End Sub

    Function Count() As Long
        Return count
    End Function

'   Function ContainsKey(key As Key) As Boolean
'   End Function
'   Function ContainsValue(value As T) As Boolean
'   End Function
'   Function GetEnumerator() As Enumerator
'   Function Remove(key As Key) As Boolean
'   End Function
'   Function TryGetValue(key As Key, ByRef value As T) As Boolean
'   End Function

    'Classses
'   Class KeyCollection
'   Class ValuesCollection
'   Class Enumerator

Private

'   comp As System.Collections.Generic.Detail.DefaultEqualityComparer<Key> 'IEqualityComparer<Key>

    Sub initialize(c As Long)
        al = ArrayList.Repeat(Nothing, c)
        count = 0
    End Sub

    Function getHash(key As Object) As Long
        Return (key.GetHashCode As DWord) Mod al.Count
    End Function

    al As ArrayList
    count As Long

End Class

End Namespace 'Generic
End Namespace 'Collections
End Namespace 'System