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1   /*
2    * Copyright 2021 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.handler.codec.compression;
17  
18  import io.netty.util.internal.ObjectUtil;
19  
20  /**
21   * {@link DeflateOptions} holds {@link #compressionLevel()},
22   * {@link #memLevel()} and {@link #windowBits()} for Deflate compression.
23   */
24  public class DeflateOptions implements CompressionOptions {
25  
26      private final int compressionLevel;
27      private final int windowBits;
28      private final int memLevel;
29  
30      /**
31       * @see StandardCompressionOptions#deflate()
32       */
33      static final DeflateOptions DEFAULT = new DeflateOptions(
34              6, 15, 8
35      );
36  
37      /**
38       * @see StandardCompressionOptions#deflate(int, int, int)
39       */
40      DeflateOptions(int compressionLevel, int windowBits, int memLevel) {
41          this.compressionLevel = ObjectUtil.checkInRange(compressionLevel, 0, 9, "compressionLevel");
42          this.windowBits = ObjectUtil.checkInRange(windowBits, 9, 15, "windowBits");
43          this.memLevel = ObjectUtil.checkInRange(memLevel, 1, 9, "memLevel");
44      }
45  
46      public int compressionLevel() {
47          return compressionLevel;
48      }
49  
50      public int windowBits() {
51          return windowBits;
52      }
53  
54      public int memLevel() {
55          return memLevel;
56      }
57  }