A Filter Dialog for a DataGridView

'' FILENAME:        GenericExpression.vb
'' NAMESPACE:       PI.Dialogs.Filter
'' APPLICATION:     N/A
'' CREATED BY:      Luke Berg
'' CREATED:         8-8-06
'' REVISED BY:      Luke Berg   
'' REVISED:         8-29-06
'' DESCRIPTION:     A class representing an expression (operand and criter) of a filter item, from which
''                  all expressions inherit.


Public Class GenericExpression

    Private _ReadableOperand As String ' A readable version of the operand
    Private _ReadableCriteria As String ' A readable version of the criteria
    Protected _Filter As String ' The filter for this filter Item

    Protected field As String ' The field the expression is filtering on.

    '' Indicates that the filter has changed
    Public Event FilterChanged(ByVal sender As Object, ByVal e As EventArgs)

    ''' <summary>
    '''  A readable version of the criteria (If the criteria were '*test*' the readable
    '''  criteria would be test)
    ''' </summary>
    Public Property ReadableCriteria() As String
        Get
            Return _ReadableCriteria
        End Get
        Set(ByVal value As String)
            _ReadableCriteria = value
        End Set
    End Property

    ''' <summary>
    '''  A readable version of the operand (instead of = it would be 'equal to')
    ''' </summary>
    Public Property ReadableOperand() As String
        Get
            Return _ReadableOperand
        End Get
        Set(ByVal value As String)
            _ReadableOperand = value
        End Set
    End Property

    ''' <summary>
    '''  A method that allows child classes to raise its event
    ''' </summary>
    ''' <remarks></remarks>
    Protected Sub RaiseFilterChanged()
        RaiseEvent FilterChanged(Me, New EventArgs)
    End Sub

    ''' <summary>
    '''  The filterstring that the filterItem of which this expression is a part of represents.
    ''' </summary>
    Public ReadOnly Property Filter() As String
        Get
            Return _Filter
        End Get
    End Property
End Class