[jira] [Created] (OAK-798) Review / refactor TreeImpl and related classes

["Michael Dürig (JIRA)" <ji...@apache.org>]

Michael Dürig created OAK-798:
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             Summary: Review / refactor TreeImpl and related classes
                 Key: OAK-798
                 URL: https://issues.apache.org/jira/browse/OAK-798
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: core
            Reporter: Michael Dürig


Now that OAK-781 is nearly complete, I'd like to follow up with pulling the new functionality into {{TreeImpl}} and its friends. A rough sketch of what I have in mind:
* Apply the concept of existence and iterability of nodes to {{Tree}} instances. So {{Tree}} would have a method {{exists}} with the same semantics as that on {{NodeBuilder}}. Namely non existing trees could be used to navigate to its children/parent. But can not be used to iterate children/properties nor to modify the tree in any way. 
* {{TreeLocation}} and its implementations would go away since trees could be navigated by its own means now. 
* Provide two {{Tree}} implementations: {{MutableTree}} and {{ImmutableTree}}. The former would replace {{TreeImpl}} and the latter would unify the current {{ReadOnlyTree}} and {{ImmutableTree}} implementations. Roughly the former would be based on {{NodeBuilder}} while the latter would be based on {{NodeState}}. Only the latter would implement {{equals}} such that two such trees are equal when its underlying node states and its names are equal. 



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