You could also use a CustomSelector to select only interfaces.

Something like :

<copy todir="../backup/dir">
	<fileset dir="${src}" casesensitive="yes">
		<custom classname="com.acme.ant.selectors.InterfacesSelector" classpath="${lib}/ant_selector.jar">
			<param dir="${src} />
		</custom>
	</fileset>
</copy>

In the implementation of InterfaceSelector you could either use 
java.lang.Class#isInterface() method or simply parse the .java class to 
see if its an interface.

Hope this helps
-Prashant

RADEMAKERS Tanguy wrote:
> if your interfaces follow some kind of a naming pattern
> ("IInterfaceName.java"), you can select them all using a fileset with a
> nested include
>
> <copy todir="../backup/dir">
> 	<fileset dir="${src}" casesensitive="yes">
> 		<filename name="**/I*.java"/>
> 	</fileset>
> </copy>
>
> /t
>
>   
>> -----Original Message-----
>> From: Bret Kumler [mailto:bkumler@goldengate.com] 
>> Sent: Friday, September 08, 2006 4:42 PM
>> To: Ant Users List
>> Subject: RE: Question
>>
>> Sorry, I forgot to mention one thing, when I sync to source sometimes
>> there's new interfaces.
>>
>> These interfaces end up missing in the instrumented classes.
>>
>> I'm trying to avoid adding a new <copy> for each interface.
>>
>> -----Original Message-----
>> From: Chun Ji [mailto:CJi@pro-unlimited.com] 
>> Sent: Thursday, September 07, 2006 11:58 AM
>> To: Ant Users List; Bret Kumler
>> Subject: RE: Question
>>
>>
>> If you just want to copy your interface classes to your "instrumented"
>> directory, it should be very easy for ant to handle. I think a <copy>
>> should be enough. 
>>
>> If you want Ant to analysis the test coverage of your 
>> interface files, I
>> have no idea. 
>>
>> -cji 
>>   
>>
>> -----Original Message-----
>> From: Bret Kumler [mailto:bkumler@goldengate.com]
>> Sent: Thursday, September 07, 2006 11:46 AM
>> To: Ant Users List
>> Subject: Question
>> Importance: Low
>>
>>
>> Is there a way in Ant to have it look at the contents of a file?
>>
>> I'm using Cobertura for code coverage and they ignore interfaces.
>>
>> I need to copy the interfaces to the classes directory for deployment.
>>
>> Thanks.
>>
>>
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