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1   /*
2    * Copyright 2016 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.string;
17  
18  import io.netty.buffer.ByteBufUtil;
19  import io.netty.util.CharsetUtil;
20  import io.netty.util.internal.ObjectUtil;
21  import io.netty.util.internal.StringUtil;
22  
23  /**
24   * A class to represent line separators in different environments.
25   */
26  public final class LineSeparator {
27  
28      /**
29       * The default line separator in the current system.
30       */
31      public static final LineSeparator DEFAULT = new LineSeparator(StringUtil.NEWLINE);
32  
33      /**
34       * The Unix line separator(LF)
35       */
36      public static final LineSeparator UNIX = new LineSeparator("\n");
37  
38      /**
39       * The Windows line separator(CRLF)
40       */
41      public static final LineSeparator WINDOWS = new LineSeparator("\r\n");
42  
43      private final String value;
44  
45      /**
46       * Create {@link LineSeparator} with the specified {@code lineSeparator} string.
47       */
48      public LineSeparator(String lineSeparator) {
49          this.value = ObjectUtil.checkNotNull(lineSeparator, "lineSeparator");
50      }
51  
52      /**
53       * Return the string value of this line separator.
54       */
55      public String value() {
56          return value;
57      }
58  
59      @Override
60      public boolean equals(Object o) {
61          if (this == o) {
62              return true;
63          }
64          if (!(o instanceof LineSeparator)) {
65              return false;
66          }
67          LineSeparator that = (LineSeparator) o;
68          return value != null ? value.equals(that.value) : that.value == null;
69      }
70  
71      @Override
72      public int hashCode() {
73          return value != null ? value.hashCode() : 0;
74      }
75  
76      /**
77       * Return a <a href="https://en.wikipedia.org/wiki/Hex_dump">hex dump</a> of the line separator in UTF-8 encoding.
78       */
79      @Override
80      public String toString() {
81          return ByteBufUtil.hexDump(value.getBytes(CharsetUtil.UTF_8));
82      }
83  }