DateRange

Update: mi sono accorto che il codice messo nel container era illeggibile... per cui l'ho tolto...

Come promesso, ecco la mia struttura per la gestione di intervalli di date.

Il corsivo deriva dal fatto che la classe è ispirata dal pattern Range, di cui ho implementato quello che mi serviva. Parte del lavoro l'ho già trovato "pronto" in questo thread. Se non è riutilizzo del codice questo....smile_regular 

Public Structure DateRange

    Public Enum IntervalType
        Milliseconds
        Second
        Minute
        Hour
        Day
    End Enum

    Public Enum Direction
        Foward
        Backward
    End Enum

    Private _start As DateTime
    Public Property Start() As DateTime
        Get
            Return _start
        End Get
        Set(ByVal value As DateTime)
            _start = value
        End Set
    End Property

    Private _end As DateTime
    Public Property [End]() As DateTime
        Get
            Return _end
        End Get
        Set(ByVal value As DateTime)
            _end = value
        End Set
    End Property

    Public Sub New(ByVal start As DateTime, ByVal [end] As DateTime)
        _start = start
        _end = [end]
    End Sub

    Public ReadOnly Property IsEmpty() As Boolean
        Get
            Return _start.CompareTo(Nothing) = 0 AndAlso _end.CompareTo(Nothing) = 0
            Return _start.Equals(Nothing) AndAlso _end.Equals(Nothing)
        End Get
    End Property

    Public Function Contains(ByVal value As DateTime) As Boolean
        Dim dateValue As DateTime = value
        Return _start.CompareTo(dateValue) <= 0 AndAlso dateValue.CompareTo(_end) <= 0
    End Function

    Public Function Contains(ByVal other As DateRange) As Boolean
        Return Me.Contains(other._start) AndAlso Me.Contains(other._end)
    End Function

    Public Function Intersect(ByVal other As DateRange) As Boolean
        Return Not (Me.Contains(other)) OrElse other.Contains(_start) OrElse other.Contains(_end)
    End Function

    Public Function Overlaps(ByVal other As DateRange) As Boolean
        Return Me.Contains(other) OrElse other.Contains(_start) OrElse other.Contains(_end)
    End Function

    Public Function Intersection(ByVal other As DateRange) As DateRange

        If Not Me.Overlaps(other) Then Return Nothing

        If Me.Contains(other) Then Return other
        If other.Contains(Me) Then Return Me

        If Me.Start > other.Start Then
            Return New DateRange(Me.Start, other.End)
        Else
            Return New DateRange(other.Start, Me.End)
        End If

    End Function

    Public Function Subtraction(ByVal other As DateRange) As IList(Of DateRange)
        Dim ret As New List(Of DateRange)

        If Me.Overlaps(other) AndAlso Not other.Contains(Me) AndAlso Not Me.Equals(other) Then
            If Me.Contains(other) Then
                If Not Me.Start = other.Start Then ret.Add(New DateRange(Me.Start, other.Start))
                If Not Me.End = other.End Then ret.Add(New DateRange(other.End, Me.End))
            Else
                If Me.Start >= other.Start Then
                    ret.Add(New DateRange(other.End, Me.End))
                Else
                    ret.Add(New DateRange(Me.Start, other.End))
                End If
            End If
        End If

        Return ret

    End Function

    Public Function Total(ByVal intervalType As IntervalType) As Double

        Select Case intervalType
            Case intervalType.Day
                Return _end.Subtract(_start).TotalDays
            Case intervalType.Hour
                Return _end.Subtract(_start).TotalHours
            Case intervalType.Milliseconds
                Return _end.Subtract(_start).TotalMilliseconds
            Case intervalType.Minute
                Return _end.Subtract(_start).TotalMinutes
            Case intervalType.Second
                Return _end.Subtract(_start).TotalSeconds

        End Select
    End Function

    Public Function Extend(ByVal value As Integer, ByVal intervalType As IntervalType, ByVal direction As Direction) As DateRange


        Select Case intervalType
            Case intervalType.Day
                If direction = DateRange.Direction.Backward Then
                    Return New DateRange(_start.AddDays(-1 * value), _end)
                Else
                    Return New DateRange(_start, _end.AddDays(value))
                End If
            Case intervalType.Hour
                If direction = DateRange.Direction.Backward Then
                    Return New DateRange(_start.AddHours(-1 * value), _end)
                Else
                    Return New DateRange(_start, _end.AddHours(value))
                End If
            Case intervalType.Minute
                If direction = DateRange.Direction.Backward Then
                    Return New DateRange(_start.AddMinutes(-1 * value), _end)
                Else
                    Return New DateRange(_start, _end.AddMinutes(value))
                End If
            Case intervalType.Second
                If direction = DateRange.Direction.Backward Then
                    Return New DateRange(_start.AddSeconds(-1 * value), _end)
                Else
                    Return New DateRange(_start, _end.AddSeconds(value))
                End If
            Case intervalType.Milliseconds
                If direction = DateRange.Direction.Backward Then
                    Return New DateRange(_start.AddMilliseconds(-1 * value), _end)
                Else
                    Return New DateRange(_start, _end.AddMilliseconds(value))
                End If
        End Select
    End Function

    Public Function Shift(ByVal value As Integer, ByVal intervalType As IntervalType, ByVal direction As Direction) As DateRange

        Select Case intervalType
            Case intervalType.Day
                If direction = DateRange.Direction.Foward Then
                    Return New DateRange(_start.AddDays(value), _end.AddDays(value))
                Else
                    Return New DateRange(_start.AddDays(-1 * value), _end.AddDays(-1 * value))
                End If
            Case intervalType.Hour
                If direction = DateRange.Direction.Foward Then
                    Return New DateRange(_start.AddHours(value), _end.AddHours(value))
                Else
                    Return New DateRange(_start.AddHours(-1 * value), _end.AddHours(-1 * value))
                End If
            Case intervalType.Minute
                If direction = DateRange.Direction.Foward Then
                    Return New DateRange(_start.AddMinutes(value), _end.AddMinutes(value))
                Else
                    Return New DateRange(_start.AddMinutes(-1 * value), _end.AddMinutes(-1 * value))
                End If
            Case intervalType.Second
                If direction = DateRange.Direction.Foward Then
                    Return New DateRange(_start.AddSeconds(value), _end.AddSeconds(value))
                Else
                    Return New DateRange(_start.AddSeconds(-1 * value), _end.AddSeconds(-1 * value))
                End If
            Case intervalType.Milliseconds
                If direction = DateRange.Direction.Foward Then
                    Return New DateRange(_start.AddMilliseconds(value), _end.AddMilliseconds(value))
                Else
                    Return New DateRange(_start.AddMilliseconds(-1 * value), _end.AddMilliseconds(-1 * value))
                End If
        End Select
    End Function

    Public Overrides Function GetHashCode() As Integer
        Return _start.GetHashCode() Xor _end.GetHashCode()
    End Function

    Public Overloads Overrides Function Equals(ByVal obj As Object) As Boolean
        If TypeOf obj Is DateRange Then
            Return Equals(DirectCast(obj, DateRange))
        Else
            Return False
        End If
    End Function

    Public Overloads Function Equals(ByVal other As DateRange) As Boolean
        Return _start.Equals(other._start) AndAlso _end.Equals(other._end)
    End Function

End Structure
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posted @ martedì 15 luglio 2008 01:37

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# DateRange in C#

Left by DDL at 24/08/2011 18:33
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DateRange in C#
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