When we add behaviour to classes with the metaClass property we can use a simple DSL. We pass a closure to the metaClass method where we group the definitions for the new behaviour. If we add multiple methods with the same name we must use <<, otherwise we can just set a closure to the method name. To add a static method we use 'static' and define the methods.
String.metaClass {
or << { String s -> delegate.plus(' or ').plus(s) }
or << { List l -> delegate.findAll("(${l.join('|')})") }
and { String s -> delegate.plus(' and ').plus(s) }
'static' {
groovy { 'Yeah man!' }
}
}
assert 'Groovy or Java?' == ("Groovy" | "Java?")
assert ['o', 'o', 'y'] == ("Groovy" | ['o', 'y'])
assert 'Groovy and Java!' == ("Groovy" & "Java!")
assert 'Yeah man!' == String.groovy()
