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'
' BooleanType.vb
'
' Authors:
' Mizrahi Rafael (rafim@mainsoft.com)
'
'
' Copyright (C) 2002-2006 Mainsoft Corporation.
' Copyright (C) 2004-2006 Novell, Inc (http://www.novell.com)
'
' Permission is hereby granted, free of charge, to any person obtaining
' a copy of this software and associated documentation files (the
' "Software"), to deal in the Software without restriction, including
' without limitation the rights to use, copy, modify, merge, publish,
' distribute, sublicense, and/or sell copies of the Software, and to
' permit persons to whom the Software is furnished to do so, subject to
' the following conditions:
'
' The above copyright notice and this permission notice shall be
' included in all copies or substantial portions of the Software.
'
' THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
' EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
' MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
' NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
' LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
' OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
' WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Imports System
Imports Microsoft.VisualBasic.CompilerServices
Namespace Microsoft.VisualBasic.CompilerServices
<System.ComponentModel.EditorBrowsable(ComponentModel.EditorBrowsableState.Never)> _
Public NotInheritable Class BooleanType
Private Sub New()
'Nobody should see constructor
End Sub
Public Shared Function FromObject(ByVal Value As Object) As Boolean
If Value Is Nothing Then
Return False
End If
If TypeOf Value Is Boolean Then
Return DirectCast(Value, Boolean)
End If
If TypeOf Value Is Integer Then
Return DirectCast(Value, Integer) <> 0
End If
If TypeOf Value Is Double Then
Return DirectCast(Value, Double) <> 0.0
End If
If TypeOf Value Is Byte Then
Return DirectCast(Value, Byte) <> 0
End If
#If NET_VER >= 2.0 Then
If TypeOf Value Is SByte Then
Return DirectCast(Value, SByte) <> 0
End If
If TypeOf Value Is UInteger Then
Return DirectCast(Value, UInteger) <> 0
End If
If TypeOf Value Is ULong Then
Return DirectCast(Value, ULong) <> 0
End If
#End If
If TypeOf Value Is Long Then
Return DirectCast(Value, Long) <> 0
End If
If TypeOf Value Is Short Then
Return DirectCast(Value, Short) <> 0
End If
If TypeOf Value Is Decimal Then
Return DirectCast(Value, Decimal) <> 0
End If
If TypeOf Value Is String Then
Return FromString(DirectCast(Value, String))
End If
Throw New ArgumentException("Value")
End Function
Public Shared Function FromString(ByVal Value As String) As Boolean
'BooleanType.FromString does not follow the pattern of implicit casting of Nothing returns 0
' so the following line should be left marked out.
' instead, an null value is converted into an empty string
' and passed to the Parse, resulting in FormatException
'
'If Value Is Nothing Then Return False
If Value Is Nothing Then Value = ""
#If TRACE Then
Console.WriteLine("TRACE:BooleanType.FromString:input:" + Value.ToString())
#End If
If Value = "0" Then
Return False
End If
' if Value is 'True' or 'False'
If (Value.ToLower() = "true") Then
Return True
End If
If (Value.ToLower() = "false") Then
Return False
End If
Try
Dim retd As Double
retd = DoubleType.Parse(Value)
If (retd <> 0) Then
Return True
Else
Return False
End If
Catch ex As System.FormatException
Throw New InvalidCastException(String.Format(Utils.GetResourceString("CastFromStringToType"), Value, "Boolean"), ex)
End Try
End Function
End Class
End Namespace
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