1 /*
2 * This file is part of Waarp Project (named also Waarp or GG).
3 *
4 * Copyright (c) 2019, Waarp SAS, and individual contributors by the @author
5 * tags. See the COPYRIGHT.txt in the distribution for a full listing of
6 * individual contributors.
7 *
8 * All Waarp Project is free software: you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or (at your
11 * option) any later version.
12 *
13 * Waarp is distributed in the hope that it will be useful, but WITHOUT ANY
14 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
15 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * Waarp . If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 /*
22 * Licensed under the Apache License, Version 2.0 (the "License");
23 * you may not use this file except in compliance with the License.
24 * You may obtain a copy of the License at
25 *
26 * http://www.apache.org/licenses/LICENSE-2.0
27 *
28 * Unless required by applicable law or agreed to in writing, software
29 * distributed under the License is distributed on an "AS IS" BASIS,
30 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
31 * See the License for the specific language governing permissions and
32 * limitations under the License.
33 */
34 package org.waarp.compress.zstdsafe;
35
36 class HuffmanCompressionContext {
37 private final HuffmanTableWriterWorkspace tableWriterWorkspace =
38 new HuffmanTableWriterWorkspace();
39 private final HuffmanCompressionTableWorkspace compressionTableWorkspace =
40 new HuffmanCompressionTableWorkspace();
41
42 private HuffmanCompressionTable previousTable =
43 new HuffmanCompressionTable(Huffman.MAX_SYMBOL_COUNT);
44 private HuffmanCompressionTable temporaryTable =
45 new HuffmanCompressionTable(Huffman.MAX_SYMBOL_COUNT);
46
47 private HuffmanCompressionTable previousCandidate = previousTable;
48 private HuffmanCompressionTable temporaryCandidate = temporaryTable;
49
50 public HuffmanCompressionTable getPreviousTable() {
51 return previousTable;
52 }
53
54 public HuffmanCompressionTable borrowTemporaryTable() {
55 previousCandidate = temporaryTable;
56 temporaryCandidate = previousTable;
57
58 return temporaryTable;
59 }
60
61 public void discardTemporaryTable() {
62 previousCandidate = previousTable;
63 temporaryCandidate = temporaryTable;
64 }
65
66 public void saveChanges() {
67 temporaryTable = temporaryCandidate;
68 previousTable = previousCandidate;
69 }
70
71 public HuffmanCompressionTableWorkspace getCompressionTableWorkspace() {
72 return compressionTableWorkspace;
73 }
74
75 public HuffmanTableWriterWorkspace getTableWriterWorkspace() {
76 return tableWriterWorkspace;
77 }
78 }