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.codec.prefixtree.encode.other;
20
21 import org.apache.hadoop.classification.InterfaceAudience;
22
23 /**
24 * Detect if every KV has the same KeyValue.Type, in which case we don't need to store it for each
25 * KV. If(allSameType) during conversion to byte[], then we can store the "onlyType" in blockMeta,
26 * therefore not repeating it for each cell and saving 1 byte per cell.
27 */
28 @InterfaceAudience.Private
29 public class CellTypeEncoder {
30
31 /************* fields *********************/
32
33 protected boolean pendingFirstType = true;
34 protected boolean allSameType = true;
35 protected byte onlyType;
36
37
38 /************* construct *********************/
39
40 public void reset() {
41 pendingFirstType = true;
42 allSameType = true;
43 }
44
45
46 /************* methods *************************/
47
48 public void add(byte type) {
49 if (pendingFirstType) {
50 onlyType = type;
51 pendingFirstType = false;
52 } else if (onlyType != type) {
53 allSameType = false;
54 }
55 }
56
57
58 /**************** get/set **************************/
59
60 public boolean areAllSameType() {
61 return allSameType;
62 }
63
64 public byte getOnlyType() {
65 return onlyType;
66 }
67
68 }