Annotation Type IndexedProperty

  • @Documented
    public @interface IndexedProperty
    Field annotation used with properties to provide an indexed getter and setter for the property. Groovy provides nice GPath syntax support for accessing indexed properties but Java tools or frameworks may expect the JavaBean style setters and getters.

    Example usage: suppose you have a class with the following properties:

     @IndexedProperty FieldType[] someField
     @IndexedProperty List otherField
     @IndexedProperty List furtherField
    will add the following methods to the class containing the properties:
     FieldType getSomeField(int index) {
     FieldType getOtherField(int index) {
     Object getFurtherField(int index) {
     void setSomeField(int index, FieldType val) {
         someField[index] = val
     void setOtherField(int index, FieldType val) {
         otherField[index] = val
     void setFurtherField(int index, Object val) {
         furtherField[index] = val
    Normal Groovy visibility rules for properties apply (i.e. no public, private or package visibility can be specified) or you will receive a compile-time error message. The normal Groovy property getters and setters will also be created.

    More examples:

     import groovy.transform.IndexedProperty
     class Group {
         String name
         List members = []
     class IndexedGroup {
         String name
         @IndexedProperty List members = []
     def group = new Group(name: 'Groovy')
     group.members[0] = 'mrhaki'
     group.members[1] = 'Hubert'
     assert 2 == group.members.size()
     assert ['mrhaki', 'Hubert'] == group.members
     try {
         group.setMembers(0, 'hubert') // Not index property
     } catch (MissingMethodException e) {
         assert e
     def indexedGroup = new IndexedGroup(name: 'Grails')
     indexedGroup.members[0] = 'mrhaki'
     indexedGroup.setMembers 1, 'Hubert'
     assert 2 == indexedGroup.members.size()
     assert 'mrhaki' == indexedGroup.getMembers(0)
     assert 'Hubert' == indexedGroup.members[1]