Auto-growing of collections should be implemented for collection writing as well as reading [SPR-6984]

[spring-projects-issues]

Andy Clement opened SPR-6984 and commented

The ability to auto-grow collections (when a reference is made to an index beyond the current end of the collection) is currently only supported for read, it should also be supported for write. For example, this code:

expression = parser.parseExpression("address.crossStreets[0]");
expression.getValue(context);

automatically ensures crossStreets is grown to include a first entry and returns it (if the parser has been configured to auto-grow collections). This fails:

expression = parser.parseExpression("address.crossStreets[0]");
expression.setValue(context,"Foo");

with an error indicating the collection is null.

---

Affects: 3.0.1

Referenced from: commits d932c04

[spring-projects-issues]

Andy Clement commented

test and fix committed. Refactored (extract method) collection growing code in Indexer, now same code used for both get and set