HBASE-22844 Fixed Checkstyle violations in client snapshot exceptions

Signed-off-by: stack <stack@apache.org>

Author: HorizonNet

hbase-client/src/main/java/org/apache/hadoop/hbase/snapshot/ClientSnapshotDescriptionUtils.java

@@ -16,31 +16,34 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
 package org.apache.hadoop.hbase.snapshot;
 
 import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.yetus.audience.InterfaceAudience;
+
 import org.apache.hadoop.hbase.shaded.protobuf.generated.SnapshotProtos;
-import org.apache.hadoop.hbase.util.Bytes;
 
 /**
  * Class to help with dealing with a snapshot description on the client side.
  * There is a corresponding class on the server side.
  */
 @InterfaceAudience.Private
-public class ClientSnapshotDescriptionUtils {
+public final class ClientSnapshotDescriptionUtils {
+  private ClientSnapshotDescriptionUtils() {
+  }
+
   /**
    * Check to make sure that the description of the snapshot requested is valid
    * @param snapshot description of the snapshot
    * @throws IllegalArgumentException if the name of the snapshot or the name of the table to
-   *           snapshot are not valid names.
+   *           snapshot are not valid names
    */
   public static void assertSnapshotRequestIsValid(SnapshotProtos.SnapshotDescription snapshot)
       throws IllegalArgumentException {
     // make sure the snapshot name is valid
     TableName.isLegalTableQualifierName(Bytes.toBytes(snapshot.getName()), true);
-    if(snapshot.hasTable()) {
+    if (snapshot.hasTable()) {
       // make sure the table name is valid, this will implicitly check validity
       TableName tableName = TableName.valueOf(snapshot.getTable());
 
@@ -51,24 +54,28 @@ public static void assertSnapshotRequestIsValid(SnapshotProtos.SnapshotDescripti
   }
 
   /**
-   * Returns a single line (no \n) representation of snapshot metadata.  Use this instead of
-   * {@link org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription#toString()}.  We don't replace SnapshotDescrpition's toString
-   * because it is auto-generated by protoc.
-   * @param ssd
-   * @return Single line string with a summary of the snapshot parameters
+   * Returns a single line (no \n) representation of snapshot metadata. Use this instead of
+   * {@link org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription#toString()}.
+   * We don't replace
+   * {@link org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription}'s
+   * {@code toString}, because it is auto-generated by protoc.
+   *
+   * @param snapshot description of the snapshot
+   * @return single line string with a summary of the snapshot parameters
    */
-  public static String toString(SnapshotProtos.SnapshotDescription ssd) {
-    if (ssd == null) {
+  public static String toString(SnapshotProtos.SnapshotDescription snapshot) {
+    if (snapshot == null) {
       return null;
     }
+
     return new StringBuilder("{ ss=")
-            .append(ssd.getName())
+            .append(snapshot.getName())
             .append(" table=")
-            .append(ssd.hasTable() ? TableName.valueOf(ssd.getTable()) : "")
+            .append(snapshot.hasTable() ? TableName.valueOf(snapshot.getTable()) : "")
             .append(" type=")
-            .append(ssd.getType())
+            .append(snapshot.getType())
             .append(" ttl=")
-            .append(ssd.getTtl())
+            .append(snapshot.getTtl())
             .append(" }")
             .toString();
   }

hbase-client/src/main/java/org/apache/hadoop/hbase/snapshot/CorruptedSnapshotException.java

@@ -17,35 +17,38 @@
  */
 package org.apache.hadoop.hbase.snapshot;
 
-import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.client.SnapshotDescription;
-
+import org.apache.yetus.audience.InterfaceAudience;
 
 /**
- * Exception thrown when the found snapshot info from the filesystem is not valid
+ * Exception thrown when the found snapshot info from the filesystem is not valid.
  */
 @SuppressWarnings("serial")
 @InterfaceAudience.Public
 public class CorruptedSnapshotException extends HBaseSnapshotException {
-
   /**
+   * Snapshot was corrupt for some reason.
+   *
    * @param message message describing the exception
-   * @param e cause
+   * @param e the actual cause of the exception
    */
   public CorruptedSnapshotException(String message, Exception e) {
     super(message, e);
   }
 
   /**
-   * Snapshot was corrupt for some reason
+   * Snapshot was corrupt for some reason.
+   *
    * @param message full description of the failure
-   * @param snapshot snapshot that was expected
+   * @param snapshotDescription snapshot that was expected
    */
-  public CorruptedSnapshotException(String message, SnapshotDescription snapshot) {
-    super(message, snapshot);
+  public CorruptedSnapshotException(String message, SnapshotDescription snapshotDescription) {
+    super(message, snapshotDescription);
   }
 
   /**
+   * Snapshot was corrupt for some reason.
+   *
    * @param message message describing the exception
    */
   public CorruptedSnapshotException(String message) {

hbase-client/src/main/java/org/apache/hadoop/hbase/snapshot/ExportSnapshotException.java

@@ -25,17 +25,16 @@
 @InterfaceAudience.Public
 @SuppressWarnings("serial")
 public class ExportSnapshotException extends HBaseSnapshotException {
-
   /**
-   * @param msg message describing the exception
+   * @param message message describing the exception
    */
-  public ExportSnapshotException(String msg) {
-    super(msg);
+  public ExportSnapshotException(String message) {
+    super(message);
   }
 
   /**
    * @param message message describing the exception
-   * @param e cause
+   * @param e the actual cause of the exception
    */
   public ExportSnapshotException(String message, Exception e) {
     super(message, e);

hbase-client/src/main/java/org/apache/hadoop/hbase/snapshot/HBaseSnapshotException.java

@@ -18,57 +18,64 @@
 package org.apache.hadoop.hbase.snapshot;
 
 import org.apache.hadoop.hbase.DoNotRetryIOException;
-import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.client.SnapshotDescription;
+import org.apache.yetus.audience.InterfaceAudience;
 
 /**
- * General exception base class for when a snapshot fails
+ * General exception base class for when a snapshot fails.
  */
 @SuppressWarnings("serial")
 @InterfaceAudience.Public
 public class HBaseSnapshotException extends DoNotRetryIOException {
-
   private SnapshotDescription description;
 
   /**
-   * Some exception happened for a snapshot and don't even know the snapshot that it was about
-   * @param msg Full description of the failure
+   * Some exception happened for a snapshot and don't even know the snapshot that it was about.
+   *
+   * @param message the full description of the failure
    */
-  public HBaseSnapshotException(String msg) {
-    super(msg);
+  public HBaseSnapshotException(String message) {
+    super(message);
   }
 
   /**
-   * Exception for the given snapshot that has no previous root cause
-   * @param msg reason why the snapshot failed
-   * @param desc description of the snapshot that is being failed
+   * Exception for the given snapshot that has no previous root cause.
+   *
+   * @param message the reason why the snapshot failed
+   * @param snapshotDescription the description of the snapshot that is failing
    */
-  public HBaseSnapshotException(String msg, SnapshotDescription desc) {
-    super(msg);
-    this.description = desc;
+  public HBaseSnapshotException(String message, SnapshotDescription snapshotDescription) {
+    super(message);
+    this.description = snapshotDescription;
   }
 
   /**
-   * Exception for the given snapshot due to another exception
-   * @param msg reason why the snapshot failed
-   * @param cause root cause of the failure
-   * @param desc description of the snapshot that is being failed
+   * Exception for the given snapshot due to another exception.
+   *
+   * @param message the reason why the snapshot failed
+   * @param cause the root cause of the failure
+   * @param snapshotDescription the description of the snapshot that is being failed
    */
-  public HBaseSnapshotException(String msg, Throwable cause, SnapshotDescription desc) {
-    super(msg, cause);
-    this.description = desc;
+  public HBaseSnapshotException(String message, Throwable cause,
+      SnapshotDescription snapshotDescription) {
+    super(message, cause);
+    this.description = snapshotDescription;
   }
 
   /**
    * Exception when the description of the snapshot cannot be determined, due to some root other
-   * root cause
+   * root cause.
+   *
    * @param message description of what caused the failure
-   * @param e root cause
+   * @param cause the root cause
    */
-  public HBaseSnapshotException(String message, Throwable e) {
-    super(message, e);
+  public HBaseSnapshotException(String message, Throwable cause) {
+    super(message, cause);
   }
 
+  /**
+   * @return the description of the snapshot that is being failed
+   */
   public SnapshotDescription getSnapshotDescription() {
     return this.description;
   }

hbase-client/src/main/java/org/apache/hadoop/hbase/snapshot/RestoreSnapshotException.java

@@ -15,31 +15,47 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
 package org.apache.hadoop.hbase.snapshot;
 
-import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.client.SnapshotDescription;
+import org.apache.yetus.audience.InterfaceAudience;
 
 /**
  * Thrown when a snapshot could not be restored due to a server-side error when restoring it.
  */
 @SuppressWarnings("serial")
 @InterfaceAudience.Public
 public class RestoreSnapshotException extends HBaseSnapshotException {
-  public RestoreSnapshotException(String msg, SnapshotDescription desc) {
-    super(msg, desc);
+  /**
+   * @param message reason why restoring the snapshot fails
+   * @param snapshotDescription description of the snapshot attempted
+   */
+  public RestoreSnapshotException(String message, SnapshotDescription snapshotDescription) {
+    super(message, snapshotDescription);
   }
 
-  public RestoreSnapshotException(String msg, Throwable cause, SnapshotDescription desc) {
-    super(msg, cause, desc);
+  /**
+   * @param message reason why restoring the snapshot fails
+   * @param cause the root cause of the failure
+   * @param snapshotDescription description of the snapshot attempted
+   */
+  public RestoreSnapshotException(String message, Throwable cause,
+      SnapshotDescription snapshotDescription) {
+    super(message, cause, snapshotDescription);
   }
 
-  public RestoreSnapshotException(String msg) {
-    super(msg);
+  /**
+   * @param message reason why restoring the snapshot fails
+   */
+  public RestoreSnapshotException(String message) {
+    super(message);
   }
 
-  public RestoreSnapshotException(String message, Throwable e) {
-    super(message, e);
+  /**
+   * @param message reason why restoring the snapshot fails
+   * @param cause the root cause of the failure
+   */
+  public RestoreSnapshotException(String message, Throwable cause) {
+    super(message, cause);
   }
 }

hbase-client/src/main/java/org/apache/hadoop/hbase/snapshot/SnapshotCreationException.java

@@ -17,8 +17,8 @@
  */
 package org.apache.hadoop.hbase.snapshot;
 
-import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.client.SnapshotDescription;
+import org.apache.yetus.audience.InterfaceAudience;
 
 /**
  * Thrown when a snapshot could not be created due to a server-side error when
@@ -27,31 +27,34 @@
 @SuppressWarnings("serial")
 @InterfaceAudience.Public
 public class SnapshotCreationException extends HBaseSnapshotException {
-
   /**
    * Used internally by the RPC engine to pass the exception back to the client.
-   * @param msg error message to pass back
+   *
+   * @param message error message to pass back
    */
-  public SnapshotCreationException(String msg) {
-    super(msg);
+  public SnapshotCreationException(String message) {
+    super(message);
   }
 
   /**
-   * Failure to create the specified snapshot
-   * @param msg reason why the snapshot couldn't be completed
-   * @param desc description of the snapshot attempted
+   * Failure to create the specified snapshot.
+   *
+   * @param message reason why the snapshot couldn't be completed
+   * @param snapshotDescription description of the snapshot attempted
    */
-  public SnapshotCreationException(String msg, SnapshotDescription desc) {
-    super(msg, desc);
+  public SnapshotCreationException(String message, SnapshotDescription snapshotDescription) {
+    super(message, snapshotDescription);
   }
 
   /**
-   * Failure to create the specified snapshot due to an external cause
-   * @param msg reason why the snapshot couldn't be completed
-   * @param cause root cause of the failure
-   * @param desc description of the snapshot attempted
+   * Failure to create the specified snapshot due to an external cause.
+   *
+   * @param message reason why the snapshot couldn't be completed
+   * @param cause the root cause of the failure
+   * @param snapshotDescription description of the snapshot attempted
    */
-  public SnapshotCreationException(String msg, Throwable cause, SnapshotDescription desc) {
-    super(msg, cause, desc);
+  public SnapshotCreationException(String message, Throwable cause,
+      SnapshotDescription snapshotDescription) {
+    super(message, cause, snapshotDescription);
   }
 }

hbase-client/src/main/java/org/apache/hadoop/hbase/snapshot/SnapshotDoesNotExistException.java

@@ -17,27 +17,27 @@
  */
 package org.apache.hadoop.hbase.snapshot;
 
-import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.client.SnapshotDescription;
-
+import org.apache.yetus.audience.InterfaceAudience;
 
 /**
- * Thrown when the server is looking for a snapshot but can't find the snapshot on the filesystem
+ * Thrown when the server is looking for a snapshot, but can't find the snapshot on the filesystem.
  */
 @SuppressWarnings("serial")
 @InterfaceAudience.Public
 public class SnapshotDoesNotExistException extends HBaseSnapshotException {
   /**
-   * @param msg full description of the failure
+   * @param message the full description of the failure
    */
-  public SnapshotDoesNotExistException(String msg) {
-    super(msg);
+  public SnapshotDoesNotExistException(String message) {
+    super(message);
   }
 
   /**
-   * @param desc expected snapshot to find
+   * @param snapshotDescription expected snapshot to find
    */
-  public SnapshotDoesNotExistException(SnapshotDescription desc) {
-    super("Snapshot '" + desc.getName() +"' doesn't exist on the filesystem", desc);
+  public SnapshotDoesNotExistException(SnapshotDescription snapshotDescription) {
+    super("Snapshot '" + snapshotDescription.getName() + "' doesn't exist on the filesystem",
+        snapshotDescription);
   }
 }