How check for a condition in ant and depending on its value print a message?

Question

This is a small piece of code please give a look at it then follow the description....

Answer 1

Peter is trying to explain that you must explicitly specify the property name. Try the following to make your code work:

<project name="demo" default="Mytarget">

    <condition property="windoze">
        <or>
            <equals arg1="${param1}" arg2="win-x86"/>
            <equals arg1="${param1}" arg2="win-x86-client"/>
            <equals arg1="${param1}" arg2="win-x64"/>
        </or>
    </condition>

    <target name="Mytarget" if="windoze">
        <echo message="executing windows family build:::${param1}"/>
    </target>

</project>

A better solution would be to make use of operating system tests built into ANT's condition task.

<project name="demo" default="Mytarget">

    <condition property="windoze">
        <os family="windows"/>
    </condition>

    <target name="Mytarget" if="windoze">
        <echo message="executing windows family build:::${os.name}-${os.arch}-${os.version}"/>
    </target>

</project>

Answer 2

Since ant 1.9.1 you can do this:

<project name="tryit" xmlns:if="ant:if" xmlns:unless="ant:unless">
   <exec executable="java">
     <arg line="-X" if:true="${showextendedparams}"/>
     <arg line="-version" unless:true="${showextendedparams}"/>
   </exec>
   <condition property="onmac">
     <os family="mac"/>
   </condition>
   <echo if:set="onmac">running on MacOS</echo>
   <echo unless:set="onmac">not running on MacOS</echo>
</project>

Answer 3

Looks like you misunderstood the Condition Task:

property: The name of the property to set.

Try using the Conditionos:

Test whether the current operating system is of a given type.