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From Martin Holst Swende <martin.holst_swe...@msc.se>
Subject Re: AW: AW: New iterating task
Date Thu, 18 Dec 2008 14:26:13 GMT
That was a nice one! That one should definitely exist as well - if it 
does not already exist (?) maybe I'll implement that if time permits.

Regarding getting it into antcontrib instead - that was my intention 
from the beginning, guess I chose the wrong mailing list? Apologies...

/Martin


Jan.Materne@rzf.fin-nrw.de wrote:
> Ok, but these property names are fixed. What about
>   <property name="dir" value="someValue"/>
>   <iterate ...>
>
> The file informations could also retrieved via <basename> and <dirname>.
Together with <antcontrib:var name="..." unset="true"/> these properties could be eliminated
during each loop.
>
> Your task is more comfortable to use if you need the file information. But I think it
should be more generic and support resource collections. Maybe only file resources. The use
of a <sequential> container is also more performant than reusing <ant> or <antcall>.
>     <iterate>
>         <!-- Resource Collection to iterate -->
>         <path ... />
>         <!-- Use java.io.File methods -->
>         <param name="parent" method="getParent()"/>
>         <param name="name" method="getName()"/>
>         <!-- Use org.apache.tools.ant.types.resources.FileResource -->
>         <param name="size" method="getSize()"/>
>         <sequential>
>             <echo>
>                 The size of file '@{name}' in directory '@{parent}' is @{size} Bytes.
>             </echo>
>         <sequential>
>     </iterate>
>
>
> http://svn.apache.org/repos/asf/ant/core/trunk/src/main/org/apache/tools/ant/types/resources/FileResource.java
> http://svn.apache.org/repos/asf/ant/core/trunk/src/main/org/apache/tools/ant/types/resources/FileProvider.java
>
>
>
> Jan
>
>   
>> -----Urspr√ľngliche Nachricht-----
>> Von: Martin Holst Swende [mailto:martin.holst_swende@msc.se] 
>> Gesendet: Donnerstag, 18. Dezember 2008 12:45
>> An: Ant Developers List
>> Betreff: Re: AW: New iterating task
>>
>> Yes, it does.
>>
>> However, the foreach-task, to my understanding, cannot as 
>> easily be used 
>> in the examples I provided, since it does not provide parametrized 
>> file-information (basedir, path, name and extension). Otherwise, it is 
>> very similar.
>>
>> /Martin
>>
>> Jan.Materne@rzf.fin-nrw.de wrote:
>>     
>>> Sound very like <antcontrib:foreach> ...
>>>
>>> Jan 
>>>
>>>   
>>>       
>>>> -----Urspr√ľngliche Nachricht-----
>>>> Von: Martin Holst Swende [mailto:martin.holst_swende@msc.se] 
>>>> Gesendet: Donnerstag, 18. Dezember 2008 10:16
>>>> An: Ant Developers List
>>>> Betreff: New iterating task
>>>>
>>>> Hi all,
>>>>
>>>> I have a little utility-task that I wrote because I did not 
>>>>         
>> find any 
>>     
>>>> better alternative - but maybe I missed something obvious. So 
>>>> I thought 
>>>> I would contribute it, if there is any interest.
>>>>
>>>> Anyway, it is a kind of file iterator meant to be used on 
>>>> tasks that are 
>>>> not written to handle multiple files. Also a few other 
>>>>         
>> uses, such as 
>>     
>>>> manipulating and/or preserve paths and filenames in the 
>>>>         
>> process . Here 
>>     
>>>> is how I use it :
>>>>
>>>>    <taskdef resource="antutilstasks" classpath="jar/antutils.jar" />
>>>>
>>>>    <target name="testiterate">
>>>>        <iterate target="myecho">
>>>>            <fileset dir="." includes="**\*.java" />
>>>>            <param name="test" value="Works fine" />
>>>>        </iterate>
>>>>    </target>
>>>>
>>>>    <target name="myecho">
>>>>        <echo>
>>>>                Dir : ${dir}
>>>>                Path  : ${path}
>>>>                Filename:${filename}
>>>>                Extension:${extension}
>>>>                Extra-param: ${test}
>>>>                </echo>
>>>>    </target>
>>>>
>>>>
>>>> What it does is, for each entry in the fileset, it calls the target 
>>>> (myecho), and sets these properties : dir, path, filename, 
>>>> extension and 
>>>> any supplied extra parameters. It just lists files, so far.
>>>>
>>>> The fully qualified path is created in this manner :
>>>>
>>>> dir + path + filename + "." + extension
>>>>
>>>>
>>>> One way of using it is if I have a dir-structure, say a photoalbum, 
>>>> where thumbnails have already been generated in the same 
>>>> structure. If I 
>>>> want to copy all thumbnails, but keep their directory 
>>>> structure, normal 
>>>> file-copy will not suffice (since it will copy all to same 
>>>>         
>> directory). 
>>     
>>>> But I can do this :
>>>>
>>>>    <target name="copythumbs">
>>>>        <iterate target="mycopy">
>>>>            <fileset dir="photos" includes="**\*_thumb.jpeg" />
>>>>        </iterate>
>>>>    </target>
>>>>    <target name="mycopy">   
>>>>        <copy file="${dir}${path}${filename}.${extension}" 
>>>> todir="thumbs/${path}"/>
>>>>    </target>
>>>>
>>>> The todir will retain path, and copy files into e.g 
>>>> "thumbs/2008/01/21/img01_thumb.jpg" .
>>>>
>>>> And if I have a task that scales images, I could set it up 
>>>>         
>> like this :
>>     
>>>>    <target name="createthumbs">
>>>>        <iterate target="mythumbgenerator">
>>>>            <fileset dir="photos" includes="**\*.jpeg" />
>>>>            <param name="size" value="100x100" />
>>>>        </iterate>
>>>>    </target>
>>>>  <target name="mythumbgenerator">   
>>>>        <rescale file="${dir}${path}${filename}.${extension}" 
>>>> outfile="thumbs/${path}${filename}_thumb.${extension}" 
>>>>         
>> size="${size}"/>
>>     
>>>>   </target>
>>>>
>>>> This way, I can iterate a task not built for it (in this case 
>>>> "rescale") 
>>>> and be pretty flexible with the input parameters to that task.
>>>>
>>>> So, have I re-invented the wheel?
>>>>
>>>> Regards,
>>>> Martin Holst Swende
>>>>
>>>> -- 
>>>> Martin Holst Swende ................. MSC Konsult AB
>>>> tel: +46(0)70 9519098 ............... Vasagatan 52
>>>> martin.holst_swende@msc.se .......... 111 20 Stockholm
>>>>
>>>>
>>>>
>>>>
>>>>         
>> ---------------------------------------------------------------------
>>     
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>>>>
>>>>
>>>>     
>>>>         
>>> ---------------------------------------------------------------------
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>>>
>>>   
>>>       
>> -- 
>> Martin Holst Swende ................. MSC Konsult AB
>> tel: +46(0)70 9519098 ............... Vasagatan 52
>> martin.holst_swende@msc.se .......... 111 20 Stockholm
>>
>>
>>
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>>
>>
>>     
>
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>
>   


-- 
Martin Holst Swende ................. MSC Konsult AB
tel: +46(0)70 9519098 ............... Vasagatan 52
martin.holst_swende@msc.se .......... 111 20 Stockholm



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