Apache ANT If/Else-Condition without ANT-Contrib

build.xml

<?xml version="1.0" encoding="utf-8"?>
<project name="Ant Condition Example">
    <target name="myConditionalTask" depends="myConditionalTask-check, myConditionalTask-fail" if="myConditionalTask-check-property">
        <echo message="EXECUTE myConditionalTask" />
    </target>

    <target name="myConditionalTask-fail" unless="myConditionalTask-check-property">
        <echo message="SKIPPED myConditionalTask" />
    </target>

    <target name="myConditionalTask-check">
        <condition property="myConditionalTask-check-property">
            <equals arg1="${my.boolean.property}" arg2="true" trim="true"/>
        </condition>
    </target>
</project>

output

ant myConditionalTask
ant myConditionalTask -Dmy.boolean.property=false

myConditionalTask-check:

myConditionalTask-fail:
     [echo] SKIPPED myConditionalTask

myConditionalTask:

BUILD SUCCESSFUL
Total time: 0 seconds



ant myConditionalTask -Dmy.boolean.property=true

myConditionalTask-check:

myConditionalTask-fail:

myConditionalTask:
     [echo] EXECUTE myConditionalTask

BUILD SUCCESSFUL