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  package org.apache.hadoop.hbase.ipc;
19  
20  import org.apache.hadoop.classification.InterfaceAudience;
21  
22  /**
23   * Utility for managing the flag byte passed in response to a
24   * {@link HBaseServer.Call}
25   */
26  @InterfaceAudience.Private
27  class ResponseFlag {
28    private static final byte ERROR_BIT = 0x1;
29    private static final byte LENGTH_BIT = 0x2;
30  
31    private ResponseFlag() {
32      // Make it so this class cannot be constructed.
33    }
34  
35    static boolean isError(final byte flag) {
36      return (flag & ERROR_BIT) != 0;
37    }
38  
39    static boolean isLength(final byte flag) {
40      return (flag & LENGTH_BIT) != 0;
41    }
42  
43    static byte getLengthSetOnly() {
44      return LENGTH_BIT;
45    }
46  
47    static byte getErrorAndLengthSet() {
48      return LENGTH_BIT | ERROR_BIT;
49    }
50  }