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

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

Simone Tripodi created OAK-529:
----------------------------------

             Summary: 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


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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