[CAMEL-18070] camel-core - Simple - Make it easy to check if property placeholder exists or not

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.18.0
• Component/s: camel-core
• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Claus Ibsen
• Created: 06/May/22 10:31
• Updated: 23/May/22 15:22
• Resolved: 23/May/22 15:22

Description

To make it easy to check that keyName exists or not.

Well its easy to check if it exists but not the opposite

<simple>?keyName</simple>

We need a not argument for this

<simple>?keyName == null</simple>

Or something ala

<simple>!keyName</simple>

<simple>${properties:!keyName}</simple>