[JS2-968] Enhance NavigationalState encoding to support both zero and empty parameter values

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.0
• Fix Version/s: 2.2.0
• Component/s: Components Core
• Assignee: Ate Douma
• Reporter: Ate Douma
• Created: 16/Apr/09 09:25
• Updated: 04/Oct/11 21:08
• Resolved: 16/Apr/09 09:32

Description

For the new JSR-286 Public Render Parameters it is required to encode the intended removal of parameter.
The current NavigationalState encoding/decoding (JetspeedNavigationalStateCodec) however always expects at least one (non-empty) value to be provided.
In addition, and something which has been an oversight so far, it is valid to set empty parameter value(s) for a parameter, both for the servlet api and the portlet api (1.0 and 2.0).

I'll update the NavigationalState encoding/decoding to deal with both requirements: null and empty parameter values, whereas a null value is only allowed for encoding the removal of a public render parameter (doesn't apply to "private" parameters).