[dna-issues] [JBoss JIRA] Commented: (DNA-467) Add search/query support to the graph API

Sat Oct 3 00:08:01 EDT 2009

    [ https://jira.jboss.org/jira/browse/DNA-467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12488316#action_12488316 ] 

Randall Hauch commented on DNA-467:
-----------------------------------

Added a lot more implementation and unit tests behind the XPath parser, the XPath AST objects, and the translator that converts an XPath AST into a SQL query model. Found and fixed a number of issues in several of the 'dna-graph' classes, including some tweaks to the SQL query odel, the SQL parser, minor improvements to the JodaDateTime class, and some changes to the exception handling in the 'dna-graph' query model and builder.

At this point, the XPath support is pretty good, though still not complete.  It may be good enough to use for a while - until we have more examples.  The unit tests are verifying not only that the XPath expressions can be parsed, but that they're also converted correctly to an expected SQL representation.

The XPath functionality has not yet been integrated into the JCR implementation, since that requires hooking up the LuceneQueryEngine (which still needs some work).  However, I plan to start putting more of the pieces together and focusing on wrapping up the LuceneQueryEngine (which isn't as finished as I thought).

> Add search/query support to the graph API
> -----------------------------------------
>
>                 Key: DNA-467
>                 URL: https://jira.jboss.org/jira/browse/DNA-467
>             Project: DNA
>          Issue Type: Feature Request
>          Components: API, Connectors, Graph
>    Affects Versions: 0.5
>            Reporter: Randall Hauch
>            Assignee: Randall Hauch
>            Priority: Blocker
>             Fix For: 0.7
>
>
> The graph system needs to be able to push a search/query down to a connector, and we need to develop a query model (in the form of concrete classes, probably immutable).  Connectors can optionally support queries, and if they do they will process the query and return the results.
> Particular language bindings would be put on top of this query model.  For example, JCR 1.0 defines an XPath language.  Support for each language would parse a query in that language and produce a query model.

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