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From ant-...@apache.org
Subject [Ant Wiki] Updated: AntTasks
Date Wed, 20 Oct 2004 06:15:09 GMT
   Date: 2004-10-19T23:15:09
   Editor: JanMatèrne <jhm@apache.org>
   Wiki: Ant Wiki
   Page: AntTasks
   URL: http://wiki.apache.org/ant/AntTasks

   Execut a target depending on the value of a property

Change Log:

------------------------------------------------------------------------------
@@ -46,5 +46,44 @@
 BUILD SUCCESSFUL
 Total time: 3 seconds
 }}}
+
+== The AntCall Task ==
+
+[http://ant.apache.org/manual/CoreTasks/antcall.html]
+
+Sometimes on the mailinglists there is a question on how to invoke a special target depending
+on the '''value''' of a property. Because there could be more than two values, you can´t
use
+the usual if/unless-attributes of the target.
+
+But the solution is quite easy: compound the name of the target by a common term and the
value
+itself and let antcall do the job.
+
+__Ant Example Target__
+{{{
+<project default="call">
+    <target name="foo-upload"><echo>FOO upload</echo></target>
+    <target name="bar-upload"><echo>BAR upload</echo></target>
+    <target name="test-upload"><echo>TEST upload</echo></target>
+
+    <target name="call">
+        <input message="Please choose the server "
+               validargs="foo,bar,test"
+               addproperty="server"
+               defaultvalue="test"
+        />
+        <antcall target="${server}-upload"/>
+    </target>
+</project>
+}}}
+
+You have only to ensure, that there are valid values for that property, e.g. a ''blabla''
would call the
+non existing ''blabla-upload'' which results in an error. But the input task here will ensure
that.
+
+BTW - the same can be used for loading platform specific properties:
+{{{
+<property file="${os.name}.properties"/>
+<property file="default.properties"/>
+}}}
+
 ----
 CategoryCategory

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