[jira] [Commented] (OAK-36) Implement a query parser

["Jukka Zitting (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-36?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234833#comment-13234833 ] 

Jukka Zitting commented on OAK-36:
----------------------------------

Instead of just a query parser for the set of supported languages, I'd like to see this as an interface that defines an extension point for integrating any query languages. Something like this:

{code}
interface QueryParser {

    /**
     * Parses the given query string, expressed in the specified language.
     *
     * @param query query string
     * @param language query language
     * @param namespaces applicable set of namespace prefix->URI mappings
     * @return parsed query, or <code>null</code> if the language is
     *         not supported by this parser
     * @throws QueryParserException if the query string could not be parsed
     */
    Query parse(String query, String language, Map<String, String> namespaces)
        throws QueryParserException;

}
{code}

The default XPath and SQL(2) query parsers can then be included in oak-core as standard implementations of this interface, but a particular deployment could well contain custom query parsers that add support for other query languages.
                
> Implement a query parser
> ------------------------
>
>                 Key: OAK-36
>                 URL: https://issues.apache.org/jira/browse/OAK-36
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: core
>            Reporter: Michael Dürig
>
> Implement a query parser and decide on a versatile AST representation which works with all query languages and which is extensible to future query languages.

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