How to set new property in custom task to be available to the nexted tasks inside it?

[Sharad <sh...@persistent.co.in>]

Hi,

I want to create a custom task which would execute the tasks inside it
iteratively. For example I want a custom task "tokenizer" as follows :

<tokenizer delemeter="," inputstring="sharad,rajesh,praveen">
	<echo message="${tokenextracted}"/>
</tokenizer>

This tokenizer task should tokenize the inputstring using the specified
delemeter and should execute the tasks inside it with each time value of
property "tokenextracted" set to the token (i.e. sharad and rajesh and then
praveen). Irrespective of what are the nested tasks inside the tokenizer
task, all the tasks should be executed first time with the property
"tokenextracted" set to the token 'sharad', then all the tasks are executed
again with the value set to 'rajesh' and so on.

Attached is the custom task I tried. In the custom task, I tried to add/set
the property ${testing} in the execute method, so that this property can be
used in the nested tasks inside the tokenizer task. But it didn't work.
Following is my contents in one of the target of build.xml file using my
custom task "tokenizer":

<typedef name="mytask" classname="tokenizer" classpath="mylib"
loaderref="classes"/>
<mytask>
	<echo message="Value inside = ${testing}"/>
</mytask>
<echo message="Value outside = ${testing}"/>



The output I got is as follows :

Value inside = {testing}
Value outside = mytestingvalue


When I did a setNewProperty("testing","mytestingvalue") in the execute()
method of the custom task, the property is available to the tasks after this
but not to the tasks nested inside this task.

Can anyone please help me how to set the new property in my custom task so
that it should be available to the tasks inside my task.

Thanks and Regards,
Sharad.

Re: How to set new property in custom task to be available to the nexted tasks inside it?

[Peter Reilly <pe...@corvil.com>]

You need to upgrade to ant 1.6.* for your example to
work correctly.

Also note that you will need to use Project#setProperty for
your example to iterator over the different values of
the property as setNewProperty enforces the property
is imutable feature of ant.

You should look at the <foreach> or (for ant 1.6.*) <for> tasks
from ant-contrib. The for task in particular does exactly what
you want your task to do (using macrodef style attributes instead
of properties).

<target name="token" xmlns:ac="antlib:net.sf.antcontrib">
    <ac:for list="sharad,rajesh,praveen" param="token">
       <ac:sequential>
         <echo message="token is @{token}"/>
      </ac:sequential>
   </ac:for>
<target>

Peter

Sharad wrote:

>Hi,
>
>I want to create a custom task which would execute the tasks inside it
>iteratively. For example I want a custom task "tokenizer" as follows :
>
><tokenizer delemeter="," inputstring="sharad,rajesh,praveen">
>	<echo message="${tokenextracted}"/>
></tokenizer>
>
>This tokenizer task should tokenize the inputstring using the specified
>delemeter and should execute the tasks inside it with each time value of
>property "tokenextracted" set to the token (i.e. sharad and rajesh and then
>praveen). Irrespective of what are the nested tasks inside the tokenizer
>task, all the tasks should be executed first time with the property
>"tokenextracted" set to the token 'sharad', then all the tasks are executed
>again with the value set to 'rajesh' and so on.
>
>Attached is the custom task I tried. In the custom task, I tried to add/set
>the property ${testing} in the execute method, so that this property can be
>used in the nested tasks inside the tokenizer task. But it didn't work.
>Following is my contents in one of the target of build.xml file using my
>custom task "tokenizer":
>
><typedef name="mytask" classname="tokenizer" classpath="mylib"
>loaderref="classes"/>
><mytask>
>	<echo message="Value inside = ${testing}"/>
></mytask>
><echo message="Value outside = ${testing}"/>
>
>
>
>The output I got is as follows :
>
>Value inside = {testing}
>Value outside = mytestingvalue
>
>
>When I did a setNewProperty("testing","mytestingvalue") in the execute()
>method of the custom task, the property is available to the tasks after this
>but not to the tasks nested inside this task.
>
>Can anyone please help me how to set the new property in my custom task so
>that it should be available to the tasks inside my task.
>
>Thanks and Regards,
>Sharad.
>  
>
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