HBASE-23622 Reduced the number of Checkstyle violations in hbase-common

Signed-off-by: stack <[email protected]>
Signed-off-by: Viraj Jasani <[email protected]>

hbase-common/src/main/java/org/apache/hadoop/hbase/BBKVComparator.java

@@ -20,11 +20,11 @@
 import java.util.Comparator;
 
 import org.apache.hadoop.hbase.util.ByteBufferUtils;
-import org.apache.hbase.thirdparty.com.google.common.primitives.Longs;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import org.apache.hbase.thirdparty.com.google.common.primitives.Longs;
 
 /**
  * A comparator for case where {@link ByteBufferKeyValue} is prevalent type (BBKV
@@ -71,7 +71,6 @@ public BBKVComparator(Comparator fallback) {
 
   @Override
   public int compare(Object l, Object r) {
-    // LOG.info("ltype={} rtype={}", l, r);
     if ((l instanceof ByteBufferKeyValue) && (r instanceof ByteBufferKeyValue)) {
       return compare((ByteBufferKeyValue)l, (ByteBufferKeyValue)r, false);
     }
@@ -81,7 +80,7 @@ public int compare(Object l, Object r) {
 
   // TODO: Come back here. We get a few percentage points extra of throughput if this is a
   // private method.
-  static final int compare(ByteBufferKeyValue left, ByteBufferKeyValue right,
+  static int compare(ByteBufferKeyValue left, ByteBufferKeyValue right,
       boolean ignoreSequenceid) {
     // NOTE: Same method is in CellComparatorImpl, also private, not shared, intentionally. Not
     // sharing gets us a few percent more throughput in compares. If changes here or there, make

hbase-common/src/main/java/org/apache/hadoop/hbase/CellComparator.java

@@ -54,7 +54,7 @@ static CellComparator getInstance() {
   /**
    * Compare cells.
    * @param ignoreSequenceid True if we are to compare the key portion only and ignore
-   * the sequenceid. Set to false to compare key and consider sequenceid.
+   *    the sequenceid. Set to false to compare key and consider sequenceid.
    * @return 0 if equal, -1 if a < b, and +1 if a > b.
    */
   int compare(Cell leftCell, Cell rightCell, boolean ignoreSequenceid);

hbase-common/src/main/java/org/apache/hadoop/hbase/CellComparatorImpl.java

@@ -15,21 +15,19 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
 package org.apache.hadoop.hbase;
 
 import java.util.Comparator;
 
 import org.apache.hadoop.hbase.KeyValue.Type;
 import org.apache.hadoop.hbase.util.ByteBufferUtils;
 import org.apache.hadoop.hbase.util.Bytes;
-import org.apache.hbase.thirdparty.com.google.common.primitives.Longs;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.yetus.audience.InterfaceStability;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-
+import org.apache.hbase.thirdparty.com.google.common.primitives.Longs;
 
 /**
  * Compare two HBase cells.  Do not use this method comparing <code>-ROOT-</code> or
@@ -52,11 +50,13 @@
 @InterfaceStability.Evolving
 public class CellComparatorImpl implements CellComparator {
   static final Logger LOG = LoggerFactory.getLogger(CellComparatorImpl.class);
+
   /**
    * Comparator for plain key/values; i.e. non-catalog table key/values. Works on Key portion
    * of KeyValue only.
    */
   public static final CellComparatorImpl COMPARATOR = new CellComparatorImpl();
+
   /**
    * A {@link CellComparatorImpl} for <code>hbase:meta</code> catalog table
    * {@link KeyValue}s.
@@ -342,7 +342,7 @@ private static int compareRows(byte[] left, int loffset, int llength, byte[] rig
           return -1;
         } else if (rightDelimiter < 0 && leftDelimiter >= 0) {
           return 1;
-        } else if (leftDelimiter < 0 && rightDelimiter < 0) {
+        } else if (leftDelimiter < 0) {
           return 0;
         }
       }
@@ -365,7 +365,7 @@ private static int compareRows(byte[] left, int loffset, int llength, byte[] rig
           return -1;
         } else if (rightDelimiter < 0 && leftDelimiter >= 0) {
           return 1;
-        } else if (leftDelimiter < 0 && rightDelimiter < 0) {
+        } else if (leftDelimiter < 0) {
           return 0;
         }
       }

hbase-common/src/main/java/org/apache/hadoop/hbase/net/Address.java

@@ -31,7 +31,7 @@
  * We cannot have Guava classes in our API hence this Type.
  */
 @InterfaceAudience.Public
-public class Address implements Comparable<Address> {
+public final class Address implements Comparable<Address> {
   private HostAndPort hostAndPort;
 
   private Address(HostAndPort hostAndPort) {
@@ -62,7 +62,7 @@ public String toString() {
   /**
    * If hostname is a.b.c and the port is 123, return a:123 instead of a.b.c:123.
    * @return if host looks like it is resolved -- not an IP -- then strip the domain portion
-   * otherwise returns same as {@link #toString()}}
+   *    otherwise returns same as {@link #toString()}}
    */
   public String toStringWithoutDomain() {
     String hostname = getHostname();
@@ -100,7 +100,10 @@ public int hashCode() {
   @Override
   public int compareTo(Address that) {
     int compare = this.getHostname().compareTo(that.getHostname());
-    if (compare != 0) return compare;
+    if (compare != 0) {
+      return compare;
+    }
+
     return this.getPort() - that.getPort();
   }
 }

hbase-common/src/main/java/org/apache/hadoop/hbase/trace/SpanReceiverHost.java

@@ -40,7 +40,7 @@ public class SpanReceiverHost {
   private Configuration conf;
   private boolean closed = false;
 
-  private static enum SingletonHolder {
+  private enum SingletonHolder {
     INSTANCE;
     final transient Object lock = new Object();
     transient SpanReceiverHost host = null;
@@ -78,7 +78,6 @@ public static Configuration getConfiguration(){
   /**
    * Reads the names of classes specified in the {@code hbase.trace.spanreceiver.classes} property
    * and instantiates and registers them with the Tracer.
-   *
    */
   public void loadSpanReceivers() {
     String[] receiverNames = conf.getStrings(SPAN_RECEIVERS_CONF_KEY);
@@ -93,7 +92,7 @@ public void loadSpanReceivers() {
       SpanReceiver receiver = builder.className(className).build();
       if (receiver != null) {
         receivers.add(receiver);
-        LOG.info("SpanReceiver " + className + " was loaded successfully.");
+        LOG.info("SpanReceiver {} was loaded successfully.", className);
       }
     }
     for (SpanReceiver rcvr : receivers) {
@@ -105,7 +104,10 @@ public void loadSpanReceivers() {
    * Calls close() on all SpanReceivers created by this SpanReceiverHost.
    */
   public synchronized void closeReceivers() {
-    if (closed) return;
+    if (closed) {
+      return;
+    }
+
     closed = true;
     for (SpanReceiver rcvr : receivers) {
       try {

hbase-common/src/main/java/org/apache/hadoop/hbase/trace/TraceUtil.java

@@ -38,7 +38,7 @@ private TraceUtil() {
   }
 
   public static void initTracer(Configuration c) {
-    if(c != null) {
+    if (c != null) {
       conf = new HBaseHTraceConfiguration(c);
     }
 
@@ -62,7 +62,9 @@ public static TraceScope createTrace(String description) {
    * @return TraceScope or null when not tracing
    */
   public static TraceScope createTrace(String description, Span span) {
-    if(span == null) return createTrace(description);
+    if (span == null) {
+      return createTrace(description);
+    }
 
     return (tracer == null) ? null : tracer.newScope(description, span.getSpanId());
   }

hbase-common/src/main/java/org/apache/hadoop/hbase/util/ByteRangeUtils.java

@@ -15,7 +15,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
 package org.apache.hadoop.hbase.util;
 
 import java.io.IOException;
@@ -31,12 +30,16 @@
  * Utility methods for working with {@link ByteRange}.
  */
 @InterfaceAudience.Public
-public class ByteRangeUtils {
+public final class ByteRangeUtils {
+  private ByteRangeUtils() {
+  }
 
   public static int numEqualPrefixBytes(ByteRange left, ByteRange right, int rightInnerOffset) {
     int maxCompares = Math.min(left.getLength(), right.getLength() - rightInnerOffset);
-    final byte[] lbytes = left.getBytes(), rbytes = right.getBytes();
-    final int loffset = left.getOffset(), roffset = right.getOffset();
+    final byte[] lbytes = left.getBytes();
+    final byte[] rbytes = right.getBytes();
+    final int loffset = left.getOffset();
+    final int roffset = right.getOffset();
     for (int i = 0; i < maxCompares; ++i) {
       if (lbytes[loffset + i] != rbytes[roffset + rightInnerOffset + i]) {
         return i;
@@ -76,5 +79,4 @@ public static void write(OutputStream os, ByteRange byteRange, int byteRangeInne
     os.write(byteRange.getBytes(), byteRange.getOffset() + byteRangeInnerOffset,
       byteRange.getLength() - byteRangeInnerOffset);
   }
-
 }