Ivan Bogouchev / Иван Богушев wrote:
Hi all,
I have implemented the interface
org.apache.excalibur.source.SourceValidity in a class and actually
only the no argument isValid() method gets called.
What is the intent of the method SourceValidity.isValid(SourceValidity
arg0)
From excalibur javadocs (unfortunately this javadocs are not avaliable
online):
A SourceValidity object contains all information to check if a Source
object is still valid.
There are two possibilities:
* The validity object has all information to check by itself if it is
valid (e.g. given an expires date).
* The validity object possibility needs another (newer) validity object
to compare against (e.g. to test a last modification date).
To avoid testing what the actual implementation of the validity object
supports, the invocation order is to first call isValid() and only if
this result is 0 (i.e. "don't know"), then to call isValid(SourceValidity).
Remember to call isValid(SourceValidity) when isValid() returned 0 !
Method Detail
public int isValid()
Check if the component is still valid. The possible results are :
-1: invalid. The component isn't valid anymore.
0: don't know. This validity should be checked against a new validity
object using isValid(SourceValidity).
1: valid. The component is still valid.
public int isValid(SourceValidity newValidity)
Check if the component is still valid. This is only true if the incoming
Validity is of the same type and has the "same" values.
The invocation order is that the isValid method of the old Validity
object is called with the new one as a parameter.
Returns:
-1 is returned, if the validity object is not valid anymore +1 is
returned, if the validity object is still valid 0 is returned, if the
validity check could not be performed. In this case, the new validity
object is not usable. Examples for this are: when the validity objects
have different types, or when one validity object for any reason is not
able to get the required information.
Hope this helps,
Best Regards,
Antonio Gallardo.
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