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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   * http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.hadoop.hbase.client;
20  
21  import org.apache.hadoop.hbase.classification.InterfaceAudience;
22  import org.apache.hadoop.hbase.ipc.RpcCallContext;
23  import org.apache.hadoop.hbase.ipc.RpcServer;
24  import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos;
25  
26  
27  /**
28   * Class to help with parsing the version info.
29   */
30  @InterfaceAudience.Private
31  public final class VersionInfoUtil {
32  
33    private VersionInfoUtil() {
34      /* UTIL CLASS ONLY */
35    }
36  
37    public static boolean currentClientHasMinimumVersion(int major, int minor) {
38      RpcCallContext call = RpcServer.getCurrentCall();
39      HBaseProtos.VersionInfo versionInfo = call != null ? call.getClientVersionInfo() : null;
40      return hasMinimumVersion(versionInfo, major, minor);
41    }
42  
43    public static boolean hasMinimumVersion(HBaseProtos.VersionInfo versionInfo,
44                                            int major,
45                                            int minor) {
46      if (versionInfo != null) {
47        try {
48          String[] components = versionInfo.getVersion().split("\\.");
49  
50          int clientMajor = components.length > 0 ? Integer.parseInt(components[0]) : 0;
51          if (clientMajor != major) {
52            return clientMajor > major;
53          }
54  
55          int clientMinor = components.length > 1 ? Integer.parseInt(components[1]) : 0;
56          return clientMinor >= minor;
57        } catch (NumberFormatException e) {
58          return false;
59        }
60      }
61      return false;
62    }
63  }