Logic Variables

The default variable resolver also provides the following logic variables for performing simple logical operations:

Logic Variables

IfVar - $IF{arg,then[,else]}

SwitchVar - $SW{arg,pattern1:then1[,pattern2:then2...]}

CoalesceVar - $CO{arg1[,arg2...]}

PatternMatchVar - $PM{arg,pattern}

NotEmptyVar - $NE{arg}

UpperCaseVar - $UC{arg}

LowerCaseVar - $LC{arg}

The $IF variable can be used for simple if/else logic:

# Value set to 'foo' if myBooleanProperty is true

key1 =
    $IF{
        $S{myBooleanProperty},
        foo
    }

# Value set to 'foo' if myBooleanProperty is true, 'bar' if false.

key2 =
    $IF{
        $S{myBooleanProperty},
        foo,
        bar
    }

# Value set to key1 value if myBooleanProperty is true, key2 value if false.

key3 =
    $IF{
        $S{myBooleanProperty},
        $C{key1},
        $C{key2}
    }

The $SW variable can be used for switch blocks based on pattern matching:

# Shell command depends on the OS

shellCommand =
    $SW{
        $LC{$S{os.name}},
        *win*: bat,
        linux: bash,
        *: sh
    }

The $CO variable can be used for coalescing of values (finding the first non-null/empty match):

# Debug flag can be enabled by system property or environment variable.

debug =
    $CO{
        $S{debug},
        $E{DEBUG},
        false
    }

The $PM variable can be used for calculating boolean values:

# Debug flag can be enabled by system property or environment variable.

isWindows =
    $PM{
        $LC{$S{os.name}},
        *win*
    }