[GROOVY-6134] Make @DelegatesTo support mapping to generic type argument

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.3
• Fix Version/s: 2.2.0-beta-1
• Assignee: Cédric Champeau
• Reporter: Cédric Champeau
• Created: 02/May/13 04:36
• Updated: 03/Sep/13 05:17
• Resolved: 21/May/13 17:17

Description

Following the discussion at https://gist.github.com/alkemist/5429603, it would be interesting if Groovy allowed @DelegatesTo to map onto a generic type argument.

For example:

public <T> Object map(@DelegatesTo.Target List<T> target,  @DelegatesTo(genericTypeIndex=0) Closure arg) {
    arg.delegate = target.join('')
    arg()
}
def test() {
    def result
    map(['f','o','o']) {
        result = toUpperCase()
    }

    result
}
assert 'FOO'==test()