fix parsing of the unit

src/main/java/org/caosdb/server/query/POV.java

@@ -70,8 +70,8 @@ public class POV implements EntityFilterInterface {
   private String propertiesTable = null;
   private String refIdsTable = null;
   private final HashMap<String, String> statistics = new HashMap<>();
-  private Logger logger = LoggerFactory.getLogger(getClass());
-  private Stack<String> prefix = new Stack<>();
+  private final Logger logger = LoggerFactory.getLogger(getClass());
+  private final Stack<String> prefix = new Stack<>();
 
   private Unit getUnit(final String s) throws ParserException {
     return CaosDBSystemOfUnits.getUnit(s);
@@ -116,7 +116,7 @@ public class POV implements EntityFilterInterface {
 
       // try and parse as integer
       try {
-        final Pattern dp = Pattern.compile("^(-?[0-9]++)([^(\\.[0-9])-][^-]*)?$");
+        final Pattern dp = Pattern.compile("^(-?[0-9]++)\\s*([^(\\.[0-9])-][^-]*)?$");
         final Matcher m = dp.matcher(value);
         if (!m.matches()) {
           throw new NumberFormatException();
@@ -133,7 +133,7 @@ public class POV implements EntityFilterInterface {
         this.vDouble = (double) this.vInt;
       } else {
         try {
-          final Pattern dp = Pattern.compile("^(-?[0-9]+(?:\\.[0-9]+))([^-]*)$");
+          final Pattern dp = Pattern.compile("^(-?[0-9]+(?:\\.[0-9]+))\\s*([^-]*)$");
           final Matcher m = dp.matcher(value);
           if (!m.matches()) {
             throw new NumberFormatException();
@@ -142,7 +142,7 @@ public class POV implements EntityFilterInterface {
           unitStr = m.group(2);
 
           this.vDouble = Double.parseDouble(vDoubleStr);
-          if ((this.vDouble % 1) == 0) {
+          if (this.vDouble % 1 == 0) {
             this.vInt = (int) Math.floor(this.vDouble);
           }
         } catch (final NumberFormatException e) {
@@ -509,14 +509,16 @@ public class POV implements EntityFilterInterface {
     return this.aggregate;
   }
 
-  private String measurement(String m) {
+  private String measurement(final String m) {
     return String.join("", prefix) + m;
   }
 
   @Override
   public String getCacheKey() {
-    StringBuilder sb = new StringBuilder();
-    if (this.getAggregate() != null) sb.append(this.aggregate);
+    final StringBuilder sb = new StringBuilder();
+    if (this.getAggregate() != null) {
+      sb.append(this.aggregate);
+    }
     sb.append(toString());
     if (this.hasSubProperty()) {
       sb.append(getSubProperty().getCacheKey());