如何在 Groovy 中将类字段标识符作为字符串获取？

Question

Suppose simple Groovy class (POGO):

class Person { String name; int age }

How to get chosen identifier at runtime? In other words identifier name (like "name" and "age") used in source code by programmer - not value held in variable of this identifier (like "James" and "32").

With result solution (if there is any) it would be possible to write something like this (syntactically wrong pseudo code):

assert new Person().name.identifierAsString == 'name'
assert new Person().age.identifierAsString == 'age'

Please note I'm not trying to get list of field names (like Person.declaredFields ), but compile-time safe way to get field identifier as String .

Answer 1

I'm not certain what you're trying to accomplish, but you can get all of the declared field names like so:

assert ['name', 'age'] == Person.declaredFields.findAll { !it.synthetic }.collect { it.name }

And otherwise declaredFields is a list of java.lang.reflect.Field that you can use.

Answer 2

I wrote a lib sometime ago to write type-checked queries. It might be what you are after:

import org.latitude.Latitude

Customer customer = Latitude.forClass Customer
assert customer instanceof Customer
assert customer.name == "name"