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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   * 
25   * Abstract class that implements {@link ByteArray}.  This class will only be 
26   * used internally and should not be used by end users.
27   *
28   * @author The Apache MINA Project (dev@mina.apache.org)
29   * @version $Rev$, $Date$
30   */
31  abstract class AbstractByteArray implements ByteArray
32  {
33  
34      /**
35       * @inheritDoc
36       */
37      public final int length()
38      {
39          return last() - first();
40      }
41  
42  
43      /**
44       * @inheritDoc
45       */
46      @Override
47      public final boolean equals( Object other )
48      {
49          // Optimization: compare pointers.
50          if ( other == this )
51          {
52              return true;
53          }
54          // Compare types.
55          if ( !( other instanceof ByteArray ) )
56          {
57              return false;
58          }
59          ByteArray otherByteArray = ( ByteArray ) other;
60          // Compare properties.
61          if ( first() != otherByteArray.first() || last() != otherByteArray.last()
62              || !order().equals( otherByteArray.order() ) )
63          {
64              return false;
65          }
66          // Compare bytes.
67          Cursor cursor = cursor();
68          Cursor otherCursor = otherByteArray.cursor();
69          for ( int remaining = cursor.getRemaining(); remaining > 0; )
70          {
71              // Optimization: prefer int comparisons over byte comparisons
72              if ( remaining >= 4 )
73              {
74                  int i = cursor.getInt();
75                  int otherI = otherCursor.getInt();
76                  if ( i != otherI )
77                  {
78                      return false;
79                  }
80              }
81              else
82              {
83                  byte b = cursor.get();
84                  byte otherB = otherCursor.get();
85                  if ( b != otherB )
86                  {
87                      return false;
88                  }
89              }
90          }
91          return true;
92      }
93  
94  }