Extend Groovy asType(Class) method to handle additional classes

asType.groovy

import org.joda.time.DateTime
def oldAsType = String.metaClass.getMetaMethod("asType", [Class] as Class[])
String.metaClass.asType = { Class type ->
    type.isAssignableFrom(DateTime) ?
        new DateTime(delegate) :
        oldAsType.invoke(delegate, [type] as Class[])
}
assert "2012-01-01T10:10:10" as DateTime == new DateTime("2012-01-01T10:10:10")
assert "1234" as Integer == 1234