1 /**
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19 package org.apache.hadoop.hbase.master.normalizer;
20
21 import org.apache.hadoop.hbase.classification.InterfaceAudience;
22 import org.apache.hadoop.hbase.client.Admin;
23
24 /**
25 * Plan which signifies that no normalization is required,
26 * or normalization of this table isn't allowed, this is singleton.
27 */
28 @InterfaceAudience.Private
29 public final class EmptyNormalizationPlan implements NormalizationPlan {
30 private static final EmptyNormalizationPlan instance = new EmptyNormalizationPlan();
31
32 private EmptyNormalizationPlan() {
33 }
34
35 /**
36 * @return singleton instance
37 */
38 public static EmptyNormalizationPlan getInstance(){
39 return instance;
40 }
41
42 /**
43 * No-op for empty plan.
44 */
45 @Override
46 public void execute(Admin admin) {
47 }
48 }