Listing 1 Condition checking the Ant way

<project default="MAIN">

    <tstamp>
        <format property="today" pattern="yyyy_MM_dd_HH_mm" />
    </tstamp>

    <property file="properties/example1.properties" />

    <!-- Check to see if file and directory exist -->
    <available property="isDir" file="${dir.location}" type="dir" />
    <available property="isFile" file="${file.location}" type="file" />

    <!-- Test validity of conditions and if found to be true
 define the property isConfigured-->
    <condition property="isConfigured">
        <and>
            <isset property="isDir" />
            <isset property="isFile" />
            <isset property="property.value" />
            <not>
                <equals arg1="${user.name}" arg2="root" casesensitive="false" />
            </not>
        </and>
    </condition>

    <!-- Default target -->
    <target name="MAIN">
        <!-- Some errors are best failed from the command line such as \
         if you cannot log -->
        <echo> Trying to open logfile ${log.dir}/example1_${today}_.log
           If you fail at this point then the ${log.dir} is probably 
           not defined correctly in your example1.properties file
    </echo>
        <record name="${log.dir}/example1_${today}_.log" \
         loglevel="error" action="start" />
        <antcall target="report_bad_configuration" />
        <antcall target="WE_SHOULD_NOT_BE_HERE" />
        <record name="${log.dir}/example1_${today}_.log" action="stop" />
    </target>
    
    <!--Pump out inbuilt variables -->
    <target name="info" description="Show System specific properties">
    <echo>
    java.version = ${java.version} - Java Runtime Environment version 
    java.vendor = ${java.vendor} - Java Runtime Environment vendor 
    java.vendor.url = ${java.vendor.url} - Java vendor URL 
    java.home = ${java.home} - Java installation directory 
    java.vm.specification.version = ${java.vm.specification.version} - \
      Java Virtual Machine specification version 
    java.vm.specification.vendor = ${java.vm.specification.vendor} - \
      Java Virtual Machine specification vendor 
    java.vm.specification.name = ${java.vm.specification.name} - \
      Java Virtual Machine specification name 
    java.vm.version =  ${java.vm.version} - Java Virtual Machine \
      implementation version 
    java.vm.vendor = ${java.vm.vendor} - Java Virtual Machine \
      implementation vendor 
    java.vm.name = ${java.vm.name} - Java Virtual Machine implementation name
    java.specification.version = ${java.specification.version} - \
      Java Runtime Environment specification version 
    java.specification.vendor = ${java.specification.vendor} - \
      Java Runtime Environment specification vendor 
    java.specification.name = ${java.specification.name} - Java \
      Runtime Environment specification name 
    java.class.version = ${java.class.version} - Java class format \
      version number 
    java.class.path = ${java.class.path} - Java class path 
    java.ext.dirs = ${java.ext.dirs} - Path of extension directory or \
      directories 
    os.name = ${os.name} - Operating system name 
    os.arch = ${os.arch} - Operating system architecture 
    os.version = ${os.version} - Operating system version 
    file.separator =  ${file.separator} - File separator ("/" on UNIX) 
    path.separator = ${path.separator} - Path separator (":" on UNIX) 
    line.separator = ${line.separator} - Line separator ("\n" on UNIX) 
    user.name = ${user.name} - User's account name 
    user.home = ${user.home} - User's home directory
    user.dir = ${user.dir} - User's current working directory
                    </echo>
    </target>

    <!--If isConfigured is not defined then run this target -->
    <target name="report_bad_configuration" unless="isConfigured">
        <echo>
    System is not configured correctly
    
        Directory exists ${dir.location} = ${isDir}
        File exists ${file.location} = ${isFile}
        property.value = ${property.value}
        Uer run as = ${user.name} - Must not be ROOT
        
    Generic System properties are:
    </echo>

        <antcall target="info" />
        <fail>FAILING GRACEFULLY....</fail>
    </target>

    <!-- Only run if isConfigured is set -->
    <target name="WE_SHOULD_NOT_BE_HERE">
        <echo>Ok I will rm -rf from / as root</echo>
    </target>
</project>