[GROOVY-2443] Enum does not support instance (value) specific methods

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.7-rc-1
• Assignee: Jochen Theodorou
• Reporter: Venkat Srinivasan
• Created: 25/Dec/07 04:49
• Updated: 08/Jan/10 23:29
• Resolved: 27/Nov/09 02:50

Description

Java enum allows instance (value) specific methods. Groovy does not support this currently. The following code fails in Groovy (compilation error):

class GroovyEnumRangeTest extends GroovyTestCase {
void testEnumMethod()

{ assertEquals "Work", Day.MONDAY.activity() assertEquals "Relax", Day.SUNDAY.activity() }

}

enum Day {
SUNDAY {
String activity()

{ 'Relax' }

}, MONDAY, TUESDAY, WEDNESDAY,
THURSDAY, FRIDAY, SATURDAY

String activity()

{ 'Work' }
}

If I need it right now, I am able to use EMC to achieve this:

class GroovyEnumRangeTest extends GroovyTestCase
{
void testEnumMethod()
{
def emc = new ExpandoMetaClass(Day)
emc.activity = {-> 'Relax' }
emc.initialize()

Day.SUNDAY.metaClass = emc
assertEquals "Work", Day.MONDAY.activity()
assertEquals "Relax", Day.SUNDAY.activity()
assertEquals "Work", Day.TUESDAY.activity()
}
}

enum Day {
SUNDAY, MONDAY, TUESDAY, WEDNESDAY,
THURSDAY, FRIDAY, SATURDAY

String activity() { 'Work' }

}

so it is not major (IMHO).

Issue Links

• depends upon: GROOVY-69 support inner classes (or at least nested classes)
• is duplicated by: GROOVY-3178 Dont support method override in enum
• is duplicated by: GROOVY-3408 Groovy does not support abstract methods in enums