Having type converters available for everything helps a lot in minimising the need to worry about return formats. You could by default return the native Node objects and provide type converters to List<Map<String, Object>>.
On 17 June 2014 20:54, Gregor Zurowski <gre...@zurowski.org> wrote: > Hi Everyone: > > A recent discussion on the camel-users list [1] showed that the > camel-jcr component needs some enhancements to better support > real-world use cases. I would like to add query functionality, so that > users are able to submit JCR-SQL or JCR-XPath queries and retrieve > matching nodes. A possible implementation could look as follows: > > - Add support for new values to CamelJcrOperation header with the > names "JcrQuerySql" and "JcrQueryXPath" for triggering queries by the > producer. > - The actual query is read from the body of the IN message. > - Matching nodes are returned in the body of the OUT message. > > The question is how to return the resulting nodes? I considered the > following approaches: > > 1) Simply return an array of strings where each string is the UUID of > a matching node, e.g. [c042662a-f5be-11e3-8344-b2227cce2b54, > c0426b5c-f5be-11e3-8344-b2227cce2b54, ...]. The downside of this > approach is that the client would need to submit follow-up requests > for each UUID (e.g. with the CamelJcrGetById operation). > > 2) Return a list of javax.jcr.Node [2] instances of all matching > nodes. This is similar to what the current consumer implementation > returns (which is a list of javax.jcr.observation.Event instances). > > 3) Return a list of custom items. Each item is a translated version of > the javax.jcr.Node type where each field was converted into a common > Java type (similar to what the camel-cmis component is doing when > translating CMIS query results into a List<Map<String, Object>> data > structure). > > What would be the best approach to return query results by the > producer, i.e. what would be the Camel-way of returning the results? > > Thanks in advance, > Gregor > > [1] http://camel.465427.n5.nabble.com/Camel-JCR-examples-td5746406.html > [2] http://www.day.com/maven/jsr170/javadocs/jcr-2.0/javax/jcr/Node.html > -- Matt Sicker <boa...@gmail.com>
