21. 面向对象的LotusScript（四）之MonthConverter

布满荆棘的人生 2022-04-12 05:19 162阅读 0赞

在Notes开发中，有时会需要在月份的数字和名称之间相互转换。因为仅仅涉及到月份，用Format和DateValue函数并不方便。我们可以编写一个实用的类来解决这个问题。

%REM
    	Class MonthConverter
    	Description: Comments for Class
    %END REM
    Public Class MonthConverter
    	Private num2Name As NArray
    	Private num2FName As NArray
    	Private name2Num As Dictionary
    	Private fname2Num As Dictionary
    	
    	%REM
    		Sub New
    		Description: Comments for Sub
    	%END REM
    	Sub New()
    		'initialize num2Fname
    		Set me.num2FName=New NArray(11)
    		With me.num2FName
    			Call .Add("January")
    			Call .Add("February")
    			Call .Add("March")
    			Call .Add("April")
    			Call .Add("May")
    			Call .Add("June")
    			Call .Add("July")
    			Call .Add("August")
    			Call .Add("September")
    			Call .Add("October")
    			Call .Add("November")
    			Call .Add("December")
    		End With
    		'initialize num2Name
    		Set me.num2Name=New NArray(11)
    		Dim i As Integer 
    		For i=0 To 11
    			Call me.num2Name.Add(Left(me.num2FName.Container(i), 3))
    		Next
    		'initialize fname2Num
    		Set me.fname2Num=New Dictionary()
    		For i=0 To 11
    			Call me.fname2Num.Add(CStr(me.num2FName.Container(i)), i)
    		Next
    		'initialize name2Num
    		Set me.name2Num=New Dictionary()
    		For i=0 To 11
    			Call me.name2Num.Add(CStr(me.num2Name.Container(i)), i)
    		Next
    	End Sub
    	
    	%REM
    		Function GetName
    		Description: Comments for Function
    	%END REM
    	Public Function GetName(num As Integer) As String
    		If num<1 Or num>12 Then
    			Exit Function 
    		End If
    		me.GetName=me.num2Name.Container(num-1)
    	End Function
    	
    	%REM
    		Function GetFullName
    		Description: Comments for Function
    	%END REM
    	Public Function GetFullName(num As Integer) As String
    		If num<1 Or num>12 Then
    			Exit Function 
    		End If
    		me.GetFullName=me.num2FName.Container(num-1)
    	End Function
    	
    	%REM
    		Function GetNum
    		Description: Comments for Function
    	%END REM
    	Public Function GetNum(monthName As String) As Integer
    		Dim num
    		num=me.name2Num.Item(monthName)
    		If IsEmpty(num) Then
    			num=me.fname2Num.Item(monthName)
    		End If
    		If Not IsEmpty(num) Then
    			me.GetNum=num
    		End If
    	End Function
    End Class

GetName方法将月份数字转换成三字母缩写的月份名称。GetFullName方法将月份数字转换成英文月份名称。GetNum方法将月份名城转换成月份数字。其中用到的Dictionary和NArray在之前的面向对象的LotusScript的系列文章中都已经给出了。