[jira] [Updated] (OAK-529) Provide a utility to run JCR queries adopting a fluent-interfaces approach

["Simone Tripodi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simone Tripodi updated OAK-529:
-------------------------------

    Attachment: OAK-529.patch

The proposed patch provides an implementation for the proposed addition.

Feedbacks, suggestions, ... are welcome :)

TIA!
                
> Provide a utility to run JCR queries adopting a fluent-interfaces approach
> --------------------------------------------------------------------------
>
>                 Key: OAK-529
>                 URL: https://issues.apache.org/jira/browse/OAK-529
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: jcr
>    Affects Versions: 0.5
>            Reporter: Simone Tripodi
>            Priority: Minor
>             Fix For: 0.6
>
>         Attachments: OAK-529.patch
>
>
> I propose an approach that, without altering the current codebase, but rather adding a new layer on top of existing APIs, tries to simplify the query building and execution, i.e. rather than coding the following:
> {code}
> QueryManager qm = session.getWorkspace().getQueryManager();
> Query q = qm.createQuery("select text from [nt:base] where id = $id", Query.JCR_SQL2);
> q.bindValue("id", vf.createValue("1"));
> QueryResult r = q.execute();
> String text = null;
> RowIterator it = r.getRows();
> if (it.hasNext()) {
>     Row row = it.nextRow();
>     text = row.getValue("text").getString();
> }
> {code}
> users could write the same sentence using a shortcut like
> {code}
> String text = on(qm)
>               .sql2Query("select text from [nt:base] where id = $id")
>               .where("id").is("1")
>               .execute(textHandler);
> {code}
> where {{textHandler}} is:
> {code}
> QueryResultHandler<String> textHandler = new QueryResultHandler<String> {
>     @Override
>     public String handle(QueryResult queryResult)
>             throws RepositoryException {
>         RowIterator it = queryResult.getRows();
>         if (it.hasNext()) {
>             Row row = it.nextRow();
>             return row.getValue("text").getString();
>         }
>         return null;
>     }
> }
> {code}
> the {{QueryResultHandler}} should simplify reducing redundant query handling code, improving reusability.

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