[GROOVY-4948] Can't extend Object#asType(Class) through metaprogramming

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Not A Problem
• Affects Version/s: 1.8.0
• Component/s: groovy-jdk
• Labels: astype extend metaprogramming object
• Assignee: Jochen Theodorou
• Reporter: Johann
• Created: 26/Jul/11 15:24
• Updated: 26/Jul/11 16:55
• Resolved: 26/Jul/11 16:55

Description

I was going to extend my UUID class to let me convert instances to a byte array – the Groovy way, using metaprogramming.

However, while this

        UUID.metaClass.asType = { Class clazz ->
            UUID u = delegate
            clazz == byte[] ? ({
                LessSuckyByteArrayOutputStream bOut = new LessSuckyByteArrayOutputStream(16)
                new DataOutputStream(bOut).with {
                    writeLong(u.time)
                    writeLong(u.clockSeqAndNode)
                }
                bOut.buf
            })() : UUID.metaClass.asType(clazz)
        }

works well for

new UUID() as byte[]

writing

new UUID() as String

now prints

groovy.lang.ExpandoMetaClass@181b3d4[class com.eaio.uuid.UUID]

Using delegate.asType(clazz) results in a StackOverflowError.

I also tried other things but none of them worked either.

How can I extend Object#asType(Class) for my own types while delegating to the original code otherwise?