add interval splitting for bar charts

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

@@ -34,6 +34,8 @@ public class PlotRequest {
     private boolean keyOutside;
 
     private boolean generateThumbnail;
+    private String intervalUnit;
+    private int intervalValue;
 
     public String getQuery() {
         return query;
@@ -151,4 +153,20 @@ public class PlotRequest {
     public void setY2(final YAxisDefinition y2) {
         this.y2 = y2;
     }
+
+    public String getIntervalUnit() {
+        return intervalUnit;
+    }
+
+    public void setIntervalUnit(final String intervalUnit) {
+        this.intervalUnit = intervalUnit;
+    }
+
+    public int getIntervalValue() {
+        return intervalValue;
+    }
+
+    public void setIntervalValue(final int intervalValue) {
+        this.intervalValue = intervalValue;
+    }
 }