/**
* Return detailed information about the version whose id is passed as path argument. Returns a
* JSON map with the fields id, creator, date, added_triples, removed_triples. Triple will be
* represented in RDF/JSON format. @HTTP 404 in case the requested version does not exist
*
* @param id the ID of the version to return
* @return a JSON map representing the version information as described above
*/
@GET
@Produces("application/json")
@Path("/versions/{id:[0-9]+}")
public Response getVersion(@PathParam("id") Long id) {
try {
Version version = versioningService.getVersion(id);
if (version != null) {
Map<String, Object> result = new HashMap<String, Object>();
result.put("id", version.getId());
if (version.getCreator() != null) {
result.put("creator", version.getCreator().stringValue());
}
result.put("date", DateUtils.ISO8601FORMAT.format(version.getCommitTime()));
result.put("added_triples", JSONUtils.serializeTriplesAsJson(version.getAddedTriples()));
result.put(
"removed_triples", JSONUtils.serializeTriplesAsJson(version.getRemovedTriples()));
return Response.ok().entity(result).build();
} else {
return Response.status(Response.Status.NOT_FOUND)
.entity("version with id " + id + " does not exist")
.build();
}
} catch (SailException e) {
return Response.serverError()
.entity("error loading version " + id + ": " + e.getMessage())
.build();
}
}
private List<Map<String, Object>> formatVersions(List<Version> versions) {
List<Map<String, Object>> result = new ArrayList<Map<String, Object>>(versions.size());
for (Version version : versions) {
Map<String, Object> v_map = new HashMap<String, Object>();
v_map.put("id", version.getId());
if (version.getCreator() != null) {
v_map.put("creator", version.getCreator().stringValue());
}
v_map.put("date", DateUtils.ISO8601FORMAT.format(version.getCommitTime()));
result.add(v_map);
}
return result;
}
