ATEST-266:

- adding a method for returning all dbmodes
- temporary fix for ajax CORS call issue (see comment)

src/main/java/ch/psi/daq/queryrest/controller/QueryRestController.java

@@ -87,8 +87,7 @@ public class QueryRestController {
       }
    }
 
-   @RequestMapping(value = CHANNELS, method = {RequestMethod.GET, RequestMethod.POST},
+   @RequestMapping(value = CHANNELS, method = {RequestMethod.GET, RequestMethod.POST}, produces = {MediaType.APPLICATION_JSON_VALUE})
-         produces = {MediaType.APPLICATION_JSON_VALUE})
    public @ResponseBody Collection<String> getChannels(@RequestBody(required = false) ChannelsRequest request)
          throws Throwable {
       // in case not specified use default (e.g. GET)
@@ -113,8 +112,7 @@ public class QueryRestController {
     * @return Collection of channel names matching the specified input channel name
     * @throws Throwable in case something goes wrong
     */
-   @RequestMapping(value = CHANNELS + "/{channelName}", method = {RequestMethod.GET},
+   @RequestMapping(value = CHANNELS + "/{channelName}", method = {RequestMethod.GET}, produces = {MediaType.APPLICATION_JSON_VALUE})
-         produces = {MediaType.APPLICATION_JSON_VALUE})
    public @ResponseBody Collection<String> getChannels(@PathVariable(value = "channelName") String channelName)
          throws Throwable {
       return getChannels(new ChannelsRequest(channelName));
@@ -126,8 +124,7 @@ public class QueryRestController {
     * 
     * @return list of {@link Ordering}s as String array
     */
-   @RequestMapping(value = "ordering", method = {RequestMethod.GET},
+   @RequestMapping(value = "ordering", method = {RequestMethod.GET}, produces = {MediaType.APPLICATION_JSON_VALUE})
-         produces = {MediaType.APPLICATION_JSON_VALUE})
    public @ResponseBody List<String> getOrderingValues() {
       List<Ordering> orderings = Lists.newArrayList(Ordering.values());
       return orderings.stream()
@@ -141,8 +138,7 @@ public class QueryRestController {
     * 
     * @return list of {@link QueryField}s as String array
     */
-   @RequestMapping(value = "queryfields", method = {RequestMethod.GET},
+   @RequestMapping(value = "queryfields", method = {RequestMethod.GET}, produces = {MediaType.APPLICATION_JSON_VALUE})
-         produces = {MediaType.APPLICATION_JSON_VALUE})
    public @ResponseBody List<String> getQueryFieldValues() {
       List<QueryField> orderings = Lists.newArrayList(QueryField.values());
       return orderings.stream()
@@ -156,8 +152,7 @@ public class QueryRestController {
     * 
     * @return list of {@link Aggregation}s as String array
     */
-   @RequestMapping(value = "aggregations", method = {RequestMethod.GET},
+   @RequestMapping(value = "aggregations", method = {RequestMethod.GET}, produces = {MediaType.APPLICATION_JSON_VALUE})
-         produces = {MediaType.APPLICATION_JSON_VALUE})
    public @ResponseBody List<String> getAggregationsValues() {
       List<Aggregation> orderings = Lists.newArrayList(Aggregation.values());
       return orderings.stream()
@@ -171,8 +166,7 @@ public class QueryRestController {
     * 
     * @return list of {@link AggregationType}s as String array
     */
-   @RequestMapping(value = "aggregationtypes", method = {RequestMethod.GET},
+   @RequestMapping(value = "aggregationtypes", method = {RequestMethod.GET}, produces = {MediaType.APPLICATION_JSON_VALUE})
-         produces = {MediaType.APPLICATION_JSON_VALUE})
    public @ResponseBody List<String> getAggregationTypesValues() {
       List<AggregationType> orderings = Lists.newArrayList(AggregationType.values());
       return orderings.stream()
@@ -180,6 +174,20 @@ public class QueryRestController {
                return value.toString();
             }).collect(Collectors.toList());
    }
+
+   /**
+    * Returns the current list of {@link DBMode} values.
+    * 
+    * @return list of {@link DBMode}s as String array
+    */
+   @RequestMapping(value = "dbmodes", method = {RequestMethod.GET}, produces = {MediaType.APPLICATION_JSON_VALUE})
+   public @ResponseBody List<String> getDBModeValues() {
+      List<DBMode> orderings = Lists.newArrayList(DBMode.values());
+      return orderings.stream()
+            .map((DBMode value) -> {
+               return value.toString();
+            }).collect(Collectors.toList());
+   }
    
 
    /**

src/main/java/ch/psi/daq/queryrest/filter/CorsFilter.java

@@ -61,6 +61,11 @@ public class CorsFilter extends OncePerRequestFilter {
       response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
       response.addHeader("Access-Control-Allow-Headers", "Origin, Authorization, Accept, Content-Type");
       response.addHeader("Access-Control-Max-Age", "1800");
+      
+      
+      // FIXME zellweger_c: remove me once https://github.com/PolymerElements/iron-ajax/pull/147 has been merged!
+      response.addHeader("Access-Control-Expose-Headers", "X-JSON-Prefix");
+      
    }