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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,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License.
18   *
19   */
20  package org.apache.mina.util.byteaccess;
21  
22  /**
23   * 
24   * Abstract class that implements {@link ByteArray}.  This class will only be 
25   * used internally and should not be used by end users.
26   *
27   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
28   */
29  abstract class AbstractByteArray implements ByteArray {
30  
31      /**
32       * @inheritDoc
33       */
34      public final int length() {
35          return last() - first();
36      }
37  
38      /**
39       * @inheritDoc
40       */
41      @Override
42      public final boolean equals(Object other) {
43          // Optimization: compare pointers.
44          if (other == this) {
45              return true;
46          }
47          // Compare types.
48          if (!(other instanceof ByteArray)) {
49              return false;
50          }
51          ByteArray otherByteArray = (ByteArray) other;
52          // Compare properties.
53          if (first() != otherByteArray.first() || last() != otherByteArray.last()
54                  || !order().equals(otherByteArray.order())) {
55              return false;
56          }
57          // Compare bytes.
58          Cursor cursor = cursor();
59          Cursor otherCursor = otherByteArray.cursor();
60          for (int remaining = cursor.getRemaining(); remaining > 0;) {
61              // Optimization: prefer int comparisons over byte comparisons
62              if (remaining >= 4) {
63                  int i = cursor.getInt();
64                  int otherI = otherCursor.getInt();
65                  if (i != otherI) {
66                      return false;
67                  }
68              } else {
69                  byte b = cursor.get();
70                  byte otherB = otherCursor.get();
71                  if (b != otherB) {
72                      return false;
73                  }
74              }
75          }
76          return true;
77      }
78  
79  }