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From Michael Dürig (Commented) (JIRA) <j...@apache.org>
Subject [jira] [Commented] (OAK-28) Query implementation
Date Wed, 21 Mar 2012 14:57:39 GMT

    [ https://issues.apache.org/jira/browse/OAK-28?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234394#comment-13234394
] 

Michael Dürig commented on OAK-28:
----------------------------------

Before we go too much into details of the implementation, how would the query API for oak-core
look like? 
* Should it take a query string of some intermediate query language?
* Should it take an AST of a query? Can we leverage JQOM here? What about an extension to
JQOM as was proposed by Felix? Or should we go for another AST representation?

I think we should push very hard here in order to avoid code duplications. 
                
> Query implementation
> --------------------
>
>                 Key: OAK-28
>                 URL: https://issues.apache.org/jira/browse/OAK-28
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: core
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>         Attachments: OakToJcrQueryTreeConverter.java
>
>
> A query engine needs to be implemented. 
> This includes a query parser in oak-core (where we don't want to use the JCR API), and
a query parser in oak-jcr (where the parsed query tree needs to implement the JCR API).
> To avoid writing two independent parsers, I suggest to change the parser to emit a non-JCR
query tree (so the parser can be used in oak-core). There needs to be a converter from the
non-JCR query tree to a JCR query tree, so the same parser can be used in oak-jcr.
> This will still require two independent query tree implementations (about 37 duplicated
classes: 37 classes for oak-core and 37 classes in oak-jcr). Plus it requires a tree converter.
> If somebody has a better idea please tell me :-)
> Prototype implementation of the query tree converter. Please note the class names are
only to for illustration, but I don't know yet a good naming convention. Ideas are welcome!

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