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