-------- Original Message --------
Subject: Change property value
From: shaffic <safi...@gmail.com>
To: user@ant.apache.org
Date: Fri Feb 18 2011 14:24:22 GMT+0100 (CET)
>
> is the any alter method to change the property value which is initializd
>
> Thanks
> Shaffic
In core ant properties are immutable - for good reasons.
But there are circumstances where property immutability is cumbersome.
solution 1, use some ant plugin :
many people used antcontrib for that purpose, but antcontrib development
has stopped in 2006, i recommend an up-to-date alternative with very
innovative features => flaka [1]
<project xmlns:fl="antlib:it.haefelinger.flaka">
<fl:install-property-handler />
<property name="foo" value="bar"/>
<target name="main">
<fl:let>
<!-- define a variable -->
myvariable = 'whatever'
<!-- define a new property -->
myproperty := 'somevalue'
<!-- overwrite existing property -->
foo ::= 'baz'
</fl:let>
<echo>
myvariable => #{myvariable}
myproperty => ${myproperty}
foo => ${foo}
</echo>
</target>
</project>
solution 2, use some scripting language running in JVM
and make use of ant api. Groovy [2] recommended, because IMO (after
using javascript/rhino and jruby in ant before) groovy has the best
compatibility to java and the <groovy> task is great
<project>
<taskdef name="groovy" classname="org.codehaus.groovy.ant.Groovy"/>
<property name="foo" value="bar"/>
<target name="main">
<groovy>
<!-- define a new property -->
properties.'myproperty' = 'somevalue'
<!-- overwrite existing property -->
properties.'foo' = 'baz'
</groovy>
<echo>
myproperty => ${myproperty}
foo => ${foo}
</echo>
</target>
</project>
[1] flaka http://code.google.com/p/flaka/
[2] groovy http://groovy.codehaus.org/
Regards, Gilbert
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