Add back UnnecessaryFullyQualifiedName rule in pmd ruleset

codestyle/pmd-ruleset.xml

@@ -29,4 +29,5 @@ This ruleset defines the PMD rules for the Apache Druid project.
 
   <rule ref="category/java/codestyle.xml/UnnecessaryImport" />
   <rule ref="category/java/codestyle.xml/TooManyStaticImports" />
+  <rule ref="category/java/codestyle.xml/UnnecessaryFullyQualifiedName"/>
 </ruleset>

extensions-contrib/aliyun-oss-extensions/src/main/java/org/apache/druid/storage/aliyun/OssUtils.java

@@ -227,7 +227,7 @@ private static void deleteBucketKeys(
       throws Exception
   {
     DeleteObjectsRequest deleteRequest = new DeleteObjectsRequest(bucket).withKeys(keysToDelete);
-    OssUtils.retry(() -> {
+    retry(() -> {
       client.deleteObjects(deleteRequest);
       return null;
     });

extensions-contrib/compressed-bigdecimal/src/main/java/org/apache/druid/compressedbigdecimal/Utils.java

@@ -128,7 +128,7 @@ public static CompressedBigDecimal objToCompressedBigDecimalWithScale(
       boolean strictNumberParse
   )
   {
-    CompressedBigDecimal compressedBigDecimal = Utils.objToCompressedBigDecimal(obj, strictNumberParse);
+    CompressedBigDecimal compressedBigDecimal = objToCompressedBigDecimal(obj, strictNumberParse);
 
     if (compressedBigDecimal != null) {
       return scaleIfNeeded(compressedBigDecimal, scale);

extensions-contrib/kubernetes-overlord-extensions/src/main/java/org/apache/druid/k8s/overlord/common/PeonPhase.java

@@ -34,7 +34,7 @@ public enum PeonPhase
   UNKNOWN("Unknown"),
   RUNNING("Running");
 
-  private static final Map<String, PeonPhase> PHASE_MAP = Arrays.stream(PeonPhase.values())
+  private static final Map<String, PeonPhase> PHASE_MAP = Arrays.stream(values())
                                                                 .collect(Collectors.toMap(
                                                                     PeonPhase::getPhase,
                                                                     Function.identity()

extensions-contrib/rabbit-stream-indexing-service/src/main/java/org/apache/druid/indexing/rabbitstream/supervisor/RabbitStreamSupervisorTuningConfig.java

@@ -173,9 +173,7 @@ public Duration getShutdownTimeout()
   public Duration getRepartitionTransitionDuration()
   {
     // just return a default for now.
-    return SeekableStreamSupervisorTuningConfig.defaultDuration(
-        null,
-        SeekableStreamSupervisorTuningConfig.DEFAULT_REPARTITION_TRANSITION_DURATION);
+    return SeekableStreamSupervisorTuningConfig.defaultDuration(null, DEFAULT_REPARTITION_TRANSITION_DURATION);
   }
 
   @Override

extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchHolder.java

@@ -38,15 +38,15 @@ public static HllSketchHolder fromObj(Object obj)
     if (obj instanceof HllSketchHolder) {
       return (HllSketchHolder) obj;
     } else if (obj instanceof HllSketch) {
-      return HllSketchHolder.of((HllSketch) obj);
+      return of((HllSketch) obj);
     } else if (obj instanceof Union) {
-      return HllSketchHolder.of((Union) obj);
+      return of((Union) obj);
     } else if (obj instanceof byte[]) {
-      return HllSketchHolder.of(HllSketch.heapify((byte[]) obj));
+      return of(HllSketch.heapify((byte[]) obj));
     } else if (obj instanceof Memory) {
-      return HllSketchHolder.of(HllSketch.wrap((Memory) obj));
+      return of(HllSketch.wrap((Memory) obj));
     } else if (obj instanceof String) {
-      return HllSketchHolder.of(HllSketch.heapify(StringUtils.decodeBase64(StringUtils.toUtf8((String) obj))));
+      return of(HllSketch.heapify(StringUtils.decodeBase64(StringUtils.toUtf8((String) obj))));
     }
 
     throw new ISE("Object is not of a type[%s] that can be deserialized to sketch.", obj.getClass());

extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/theta/SketchHolder.java

@@ -45,7 +45,7 @@
  */
 public class SketchHolder
 {
-  public static final SketchHolder EMPTY = SketchHolder.of(
+  public static final SketchHolder EMPTY = of(
       Sketches.updateSketchBuilder()
               .build()
               .compact(true, null)
@@ -195,7 +195,7 @@ public static SketchHolder combine(Object o1, Object o2, int nomEntries)
       Union union = (Union) SetOperation.builder().setNominalEntries(nomEntries).build(Family.UNION);
       holder1.updateUnion(union);
       holder2.updateUnion(union);
-      return SketchHolder.of(union);
+      return of(union);
     }
   }
 
@@ -208,15 +208,15 @@ void invalidateCache()
   public static SketchHolder deserialize(Object serializedSketch)
   {
     if (serializedSketch instanceof String) {
-      return SketchHolder.of(deserializeFromBase64EncodedString((String) serializedSketch));
+      return of(deserializeFromBase64EncodedString((String) serializedSketch));
     } else if (serializedSketch instanceof byte[]) {
-      return SketchHolder.of(deserializeFromByteArray((byte[]) serializedSketch));
+      return of(deserializeFromByteArray((byte[]) serializedSketch));
     } else if (serializedSketch instanceof SketchHolder) {
       return (SketchHolder) serializedSketch;
     } else if (serializedSketch instanceof Sketch
                || serializedSketch instanceof Union
                || serializedSketch instanceof Memory) {
-      return SketchHolder.of(serializedSketch);
+      return of(serializedSketch);
     }
 
     throw new ISE(
@@ -228,9 +228,9 @@ public static SketchHolder deserialize(Object serializedSketch)
   public static SketchHolder deserializeSafe(Object serializedSketch)
   {
     if (serializedSketch instanceof String) {
-      return SketchHolder.of(deserializeFromBase64EncodedStringSafe((String) serializedSketch));
+      return of(deserializeFromBase64EncodedStringSafe((String) serializedSketch));
     } else if (serializedSketch instanceof byte[]) {
-      return SketchHolder.of(deserializeFromByteArraySafe((byte[]) serializedSketch));
+      return of(deserializeFromByteArraySafe((byte[]) serializedSketch));
     }
 
     return deserialize(serializedSketch);
@@ -285,13 +285,13 @@ public static SketchHolder sketchSetOperation(Func func, int sketchSize, Object.
         for (Object o : holders) {
           ((SketchHolder) o).updateUnion(union);
         }
-        return SketchHolder.of(union);
+        return of(union);
       case INTERSECT:
         Intersection intersection = (Intersection) SetOperation.builder().setNominalEntries(sketchSize).build(Family.INTERSECTION);
         for (Object o : holders) {
           intersection.intersect(((SketchHolder) o).getSketch());
         }
-        return SketchHolder.of(intersection.getResult(false, null));
+        return of(intersection.getResult(false, null));
       case NOT:
         if (holders.length < 1) {
           throw new IllegalArgumentException("A-Not-B requires at least 1 sketch");
@@ -306,7 +306,7 @@ public static SketchHolder sketchSetOperation(Func func, int sketchSize, Object.
           AnotB anotb = (AnotB) SetOperation.builder().setNominalEntries(sketchSize).build(Family.A_NOT_B);
           result = anotb.aNotB(result, ((SketchHolder) holders[i]).getSketch());
         }
-        return SketchHolder.of(result);
+        return of(result);
       default:
         throw new IllegalArgumentException("Unknown sketch operation " + func);
     }

extensions-core/druid-basic-security/src/main/java/org/apache/druid/security/basic/BasicAuthUtils.java

@@ -172,7 +172,7 @@ public static Map<String, BasicAuthorizerUser> deserializeAuthorizerUserMap(
       userMap = new HashMap<>();
     } else {
       try {
-        userMap = objectMapper.readValue(userMapBytes, BasicAuthUtils.AUTHORIZER_USER_MAP_TYPE_REFERENCE);
+        userMap = objectMapper.readValue(userMapBytes, AUTHORIZER_USER_MAP_TYPE_REFERENCE);
       }
       catch (IOException ioe) {
         throw new RuntimeException("Couldn't deserialize authorizer userMap!", ioe);
@@ -201,7 +201,7 @@ public static Map<String, BasicAuthorizerGroupMapping> deserializeAuthorizerGrou
       groupMappingMap = new HashMap<>();
     } else {
       try {
-        groupMappingMap = objectMapper.readValue(groupMappingMapBytes, BasicAuthUtils.AUTHORIZER_GROUP_MAPPING_MAP_TYPE_REFERENCE);
+        groupMappingMap = objectMapper.readValue(groupMappingMapBytes, AUTHORIZER_GROUP_MAPPING_MAP_TYPE_REFERENCE);
       }
       catch (IOException ioe) {
         throw new RuntimeException("Couldn't deserialize authorizer groupMappingMap!", ioe);
@@ -230,7 +230,7 @@ public static Map<String, BasicAuthorizerRole> deserializeAuthorizerRoleMap(
       roleMap = new HashMap<>();
     } else {
       try {
-        roleMap = objectMapper.readValue(roleMapBytes, BasicAuthUtils.AUTHORIZER_ROLE_MAP_TYPE_REFERENCE);
+        roleMap = objectMapper.readValue(roleMapBytes, AUTHORIZER_ROLE_MAP_TYPE_REFERENCE);
       }
       catch (IOException ioe) {
         throw new RuntimeException("Couldn't deserialize authorizer roleMap!", ioe);

extensions-core/druid-catalog/src/main/java/org/apache/druid/catalog/CatalogException.java

@@ -79,7 +79,7 @@ public CatalogException(
   public static CatalogException badRequest(String msg, Object...args)
   {
     return new CatalogException(
-        CatalogException.INVALID_ERROR,
+        INVALID_ERROR,
         Response.Status.BAD_REQUEST,
         msg,
         args

extensions-core/hdfs-storage/src/main/java/org/apache/druid/storage/hdfs/HdfsStorageDruidModule.java

@@ -65,9 +65,9 @@ public List<? extends Module> getJacksonModules()
   {
     return Collections.singletonList(
         new SimpleModule().registerSubtypes(
-            new NamedType(HdfsLoadSpec.class, HdfsStorageDruidModule.SCHEME),
-            new NamedType(HdfsInputSource.class, HdfsStorageDruidModule.SCHEME),
-            new NamedType(HdfsInputSourceFactory.class, HdfsStorageDruidModule.SCHEME)
+            new NamedType(HdfsLoadSpec.class, SCHEME),
+            new NamedType(HdfsInputSource.class, SCHEME),
+            new NamedType(HdfsInputSourceFactory.class, SCHEME)
         )
     );
   }

extensions-core/kafka-indexing-service/src/main/java/org/apache/druid/indexing/kafka/supervisor/KafkaSupervisorTuningConfig.java

@@ -169,7 +169,7 @@ public Duration getRepartitionTransitionDuration()
     // just return a default for now.
     return SeekableStreamSupervisorTuningConfig.defaultDuration(
         null,
-        SeekableStreamSupervisorTuningConfig.DEFAULT_REPARTITION_TRANSITION_DURATION
+        DEFAULT_REPARTITION_TRANSITION_DURATION
     );
   }
 

extensions-core/kubernetes-extensions/src/main/java/org/apache/druid/k8s/discovery/DefaultK8sApiClient.java

@@ -131,7 +131,7 @@ public boolean hasNext() throws SocketTimeoutException
           try {
             while (watch.hasNext()) {
               Watch.Response<V1Pod> item = watch.next();
-              if (item != null && item.type != null && !item.type.equals(WatchResult.BOOKMARK)) {
+              if (item != null && item.type != null && !BOOKMARK.equals(item.type)) {
                 DiscoveryDruidNodeAndResourceVersion result = null;
                 if (item.object != null) {
                   result = new DiscoveryDruidNodeAndResourceVersion(
@@ -150,7 +150,7 @@ public boolean hasNext() throws SocketTimeoutException
                     result
                 );
                 return true;
-              } else if (item != null && item.type != null && item.type.equals(WatchResult.BOOKMARK)) {
+              } else if (item != null && item.type != null && BOOKMARK.equals(item.type)) {
                 // Events with type BOOKMARK will only contain resourceVersion and no metadata. See
                 // Kubernetes API documentation for details.
                 LOGGER.debug("BOOKMARK event fired, no nothing, only update resourceVersion");

extensions-core/kubernetes-extensions/src/main/java/org/apache/druid/k8s/discovery/K8sDruidNodeAnnouncer.java

@@ -208,8 +208,8 @@ public static String getLabelSelectorForNodeRole(K8sDiscoveryConfig discoveryCon
         "%s=%s,%s=%s",
         getClusterIdentifierAnnouncementLabel(),
         discoveryConfig.getClusterIdentifier(),
-        K8sDruidNodeAnnouncer.getRoleAnnouncementLabel(nodeRole),
-        K8sDruidNodeAnnouncer.ANNOUNCEMENT_DONE
+        getRoleAnnouncementLabel(nodeRole),
+        ANNOUNCEMENT_DONE
     );
   }
 
@@ -219,9 +219,9 @@ public static String getLabelSelectorForNode(K8sDiscoveryConfig discoveryConfig,
         "%s=%s,%s=%s,%s=%s",
         getClusterIdentifierAnnouncementLabel(),
         discoveryConfig.getClusterIdentifier(),
-        K8sDruidNodeAnnouncer.getRoleAnnouncementLabel(nodeRole),
-        K8sDruidNodeAnnouncer.ANNOUNCEMENT_DONE,
-        K8sDruidNodeAnnouncer.getIdHashAnnouncementLabel(),
+        getRoleAnnouncementLabel(nodeRole),
+        ANNOUNCEMENT_DONE,
+        getIdHashAnnouncementLabel(),
         hashEncodeStringForLabelValue(node.getHostAndPortToUse())
     );
   }

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/processor/SegmentGeneratorFrameProcessorFactory.java

@@ -287,7 +287,7 @@ private static AppenderatorConfig makeAppenderatorConfig(
       @Override
       public AppendableIndexSpec getAppendableIndexSpec()
       {
-        return TuningConfig.DEFAULT_APPENDABLE_INDEX;
+        return DEFAULT_APPENDABLE_INDEX;
       }
 
       @Override
@@ -346,7 +346,7 @@ public int getMaxPendingPersists()
       @Override
       public boolean isSkipBytesInMemoryOverheadCheck()
       {
-        return TuningConfig.DEFAULT_SKIP_BYTES_IN_MEMORY_OVERHEAD_CHECK;
+        return DEFAULT_SKIP_BYTES_IN_MEMORY_OVERHEAD_CHECK;
       }
 
       @Override

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/querykit/QueryKitUtils.java

@@ -111,7 +111,7 @@ public static ClusterBy clusterByWithSegmentGranularity(
       return clusterBy;
     } else {
       final List<KeyColumn> newColumns = new ArrayList<>(clusterBy.getColumns().size() + 1);
-      newColumns.add(new KeyColumn(QueryKitUtils.SEGMENT_GRANULARITY_COLUMN, KeyOrder.ASCENDING));
+      newColumns.add(new KeyColumn(SEGMENT_GRANULARITY_COLUMN, KeyOrder.ASCENDING));
       newColumns.addAll(clusterBy.getColumns());
       return new ClusterBy(newColumns, 1);
     }
@@ -123,10 +123,10 @@ public static ClusterBy clusterByWithSegmentGranularity(
    */
   public static void verifyRowSignature(final RowSignature signature)
   {
-    if (signature.contains(QueryKitUtils.PARTITION_BOOST_COLUMN)) {
-      throw new MSQException(new ColumnNameRestrictedFault(QueryKitUtils.PARTITION_BOOST_COLUMN));
-    } else if (signature.contains(QueryKitUtils.SEGMENT_GRANULARITY_COLUMN)) {
-      throw new MSQException(new ColumnNameRestrictedFault(QueryKitUtils.SEGMENT_GRANULARITY_COLUMN));
+    if (signature.contains(PARTITION_BOOST_COLUMN)) {
+      throw new MSQException(new ColumnNameRestrictedFault(PARTITION_BOOST_COLUMN));
+    } else if (signature.contains(SEGMENT_GRANULARITY_COLUMN)) {
+      throw new MSQException(new ColumnNameRestrictedFault(SEGMENT_GRANULARITY_COLUMN));
     }
   }
 
@@ -144,7 +144,7 @@ public static RowSignature signatureWithSegmentGranularity(
     } else {
       return RowSignature.builder()
                          .addAll(signature)
-                         .add(QueryKitUtils.SEGMENT_GRANULARITY_COLUMN, ColumnType.LONG)
+                         .add(SEGMENT_GRANULARITY_COLUMN, ColumnType.LONG)
                          .build();
     }
   }
@@ -194,8 +194,8 @@ public static RowSignature sortableSignature(
   public static VirtualColumn makeSegmentGranularityVirtualColumn(final ObjectMapper jsonMapper, final QueryContext queryContext)
   {
     final Granularity segmentGranularity =
-        QueryKitUtils.getSegmentGranularityFromContext(jsonMapper, queryContext.asMap());
-    final String timeColumnName = queryContext.getString(QueryKitUtils.CTX_TIME_COLUMN_NAME);
+        getSegmentGranularityFromContext(jsonMapper, queryContext.asMap());
+    final String timeColumnName = queryContext.getString(CTX_TIME_COLUMN_NAME);
 
     if (timeColumnName == null || Granularities.ALL.equals(segmentGranularity)) {
       return null;
@@ -213,7 +213,7 @@ public static VirtualColumn makeSegmentGranularityVirtualColumn(final ObjectMapp
     }
 
     return new ExpressionVirtualColumn(
-        QueryKitUtils.SEGMENT_GRANULARITY_COLUMN,
+        SEGMENT_GRANULARITY_COLUMN,
         StringUtils.format(
             "timestamp_floor(%s, %s)",
             CalciteSqlDialect.DEFAULT.quoteIdentifier(timeColumnName),

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/sql/MSQMode.java

@@ -50,7 +50,7 @@ public enum MSQMode
   @Nullable
   public static MSQMode fromString(String str)
   {
-    for (MSQMode msqMode : MSQMode.values()) {
+    for (MSQMode msqMode : values()) {
       if (msqMode.value.equalsIgnoreCase(str)) {
         return msqMode;
       }
@@ -66,12 +66,12 @@ public String toString()
 
   public static void populateDefaultQueryContext(final String modeStr, final Map<String, Object> originalQueryContext)
   {
-    MSQMode mode = MSQMode.fromString(modeStr);
+    MSQMode mode = fromString(modeStr);
     if (mode == null) {
       throw new ISE(
           "%s is an unknown multi stage query mode. Acceptable modes: %s",
           modeStr,
-          Arrays.stream(MSQMode.values()).map(m -> m.value).collect(Collectors.toList())
+          Arrays.stream(values()).map(m -> m.value).collect(Collectors.toList())
       );
     }
     log.debug("Populating default query context with %s for the %s multi stage query mode", mode.defaultQueryContext, mode);

extensions-core/s3-extensions/src/main/java/org/apache/druid/storage/s3/S3Utils.java

@@ -327,7 +327,7 @@ public static void deleteBucketKeys(
       log.debug("Deleting keys from bucket: [%s], keys: [%s]", bucket, keys);
     }
     DeleteObjectsRequest deleteRequest = new DeleteObjectsRequest(bucket).withKeys(keysToDelete);
-    S3Utils.retryS3Operation(() -> {
+    retryS3Operation(() -> {
       s3Client.deleteObjects(deleteRequest);
       return null;
     }, retries);
@@ -353,7 +353,7 @@ static void uploadFileIfPossible(
     final PutObjectRequest putObjectRequest = new PutObjectRequest(bucket, key, file);
 
     if (!disableAcl) {
-      putObjectRequest.setAccessControlList(S3Utils.grantFullControlToBucketOwner(service, bucket));
+      putObjectRequest.setAccessControlList(grantFullControlToBucketOwner(service, bucket));
     }
     log.info("Pushing [%s] to bucket[%s] and key[%s].", file, bucket, key);
     service.putObject(putObjectRequest);

indexing-hadoop/src/main/java/org/apache/druid/indexer/DeterminePartitionsJob.java

@@ -958,7 +958,7 @@ public void close(TaskAttemptContext context)
     @Override
     public void checkOutputSpecs(JobContext job) throws IOException
     {
-      Path outDir = FileOutputFormat.getOutputPath(job);
+      Path outDir = getOutputPath(job);
       if (outDir == null) {
         throw new InvalidJobConfException("Output directory not set.");
       }