[AMBARI-1270] Add predicate objects for checking empty resource category & category count

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Assignee: Tom Beerbower
• Reporter: Tom Beerbower
• Created: 28/Jan/13 05:34
• Updated: 29/Jan/13 23:12
• Resolved: 29/Jan/13 23:12

Description

We need to be able to check through the API to see if a property category contains any properties.

For example, if we want to check to see if configurations have been overridden then we can look at the ServiceInfo/desired_configs of a component resource. If desired_configs is empty then there are no config overrides.

Through the API, we can examine the ServiceInfo/desired_configs property but we have no way to write a predicate that would allow us to query for components that contain config overrides.

In order to allow for such a query, we need the underlying predicate objects.