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From "Marcel Reutegger (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-28) Query implementation
Date Wed, 21 Mar 2012 17:09:40 GMT

    [ https://issues.apache.org/jira/browse/OAK-28?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234515#comment-13234515

Marcel Reutegger commented on OAK-28:

> query string

see also the executeQuery method in the Jackrabbit 2.4 SPI:

It also passes limit and offset because JCR 2.0 Query has setLimit() and setOffset(). Furthermore
it passes a map of bound values, but I'm not sure if that's really necessary. I'd say the
oak-jcr client could just as well put the values as literals into the serialized query statement.
> 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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