group plots by a single field

pdb-ui/src/main/java/org/lucares/pdbui/PdbController.java

@@ -50,7 +50,7 @@ public class PdbController implements HardcodedValues, CollectionUtils {
 			final int width = request.getWidth();
 
 			System.out.println(query);
-			final File image = plotter.plot(query, height, width);
+			final File image = plotter.plot(query, height, width, request.getGroupBy());
 
 			final Path relativeImagePath = plotter.getOutputDir().relativize(image.toPath());
 			return new PlotResponse(WEB_IMAGE_OUTPUT_PATH + "/" + relativeImagePath.toString());
@@ -88,6 +88,26 @@ public class PdbController implements HardcodedValues, CollectionUtils {
 		}
 	}
 
+	@RequestMapping(path = "/fields", //
+			method = RequestMethod.GET, //
+			consumes = MediaType.APPLICATION_JSON_UTF8_VALUE, //
+			produces = MediaType.APPLICATION_JSON_UTF8_VALUE //
+	)
+	@ResponseBody
+	List<String> fields() {
+
+		try {
+
+			final List<String> fields = db.getDb().getFields();
+
+			return fields;
+
+		} catch (final Exception e) {
+			e.printStackTrace();
+			throw new InternalServerError(e);
+		}
+	}
+
 	private List<AutocompleteProposal> toAutocompleteProposals(final List<Proposal> proposals) {
 
 		final List<AutocompleteProposal> result = new ArrayList<>();

pdb-ui/src/main/java/org/lucares/pdbui/domain/PlotRequest.java

@@ -7,6 +7,8 @@ public class PlotRequest {
 
 	private int width;
 
+	private String groupBy;
+
 	public String getQuery() {
 		return query;
 	}
@@ -35,4 +37,12 @@ public class PlotRequest {
 	public String toString() {
 		return query + ":" + height + "x" + width;
 	}
+
+	public String getGroupBy() {
+		return groupBy;
+	}
+
+	public void setGroupBy(final String groupBy) {
+		this.groupBy = groupBy;
+	}
 }