gistfile1.groovy

@interface Min {
    int value() default 0
}

@interface Max {
    int value() default 100
}

import org.codehaus.groovy.transform.AnnotationCollectorTransform
import org.codehaus.groovy.ast.*
import org.codehaus.groovy.control.SourceUnit

class RangeAnnotationProcessor extends AnnotationCollectorTransform {
    List<AnnotationNode> visit(AnnotationNode collector, AnnotationNode usage, AnnotatedNode annotated, SourceUnit src) {
        def minExpr = usage.getMember('from')
        def maxExpr = usage.getMember('to')

        def (minAnno, maxAnno) = getTargetAnnotationList(collector, usage, src)
        minAnno.addMember('value', minExpr)
        maxAnno.addMember('value', maxExpr)

        usage.members.remove('from')
        usage.members.remove('to')

        return [minAnno, maxAnno]
    }
}

new GroovyShell(this.class.classLoader).evaluate '''
    import groovy.transform.AnnotationCollector

    @Min @Max
    @AnnotationCollector(processor = 'RangeAnnotationProcessor')
    @interface Range {}

    class Room {
        @Range(from = 1, to = 4)
        int numberOfPersons
    }

    println new Room()
'''

How do you manage the case of a processor that have a package ?

In my case, I have a "standard" structure of package, but I can't link the processor to the annotation. I tried the class full name (with package) and simple name (like your example).