In Groovy 1.7 we can coerse objects to a boolean. We only have to provide the method asBoolean() and return true or false. This means our object can be used in a conditional context without accessing any other methods or properties.
class User {
String username
boolean active
boolean asBoolean() {
active
}
}
assert new User(username: 'mrhaki', active: true)
assert !new User(username: 'mrhaki', active: false)
// We can also add the asBoolean method with metaClass.
String.metaClass.asBoolean = {
delegate == /sure/
}
assert !'true'
assert 'sure'
