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 */
30 abstract class AbstractByteArray implements ByteArray
31 {
32
33 /**
34 * @inheritDoc
35 */
36 public final int length()
37 {
38 return last() - first();
39 }
40
41
42 /**
43 * @inheritDoc
44 */
45 @Override
46 public final boolean equals( Object other )
47 {
48 // Optimization: compare pointers.
49 if ( other == this )
50 {
51 return true;
52 }
53 // Compare types.
54 if ( !( other instanceof ByteArray ) )
55 {
56 return false;
57 }
58 ByteArray otherByteArray = ( ByteArray ) other;
59 // Compare properties.
60 if ( first() != otherByteArray.first() || last() != otherByteArray.last()
61 || !order().equals( otherByteArray.order() ) )
62 {
63 return false;
64 }
65 // Compare bytes.
66 Cursor cursor = cursor();
67 Cursor otherCursor = otherByteArray.cursor();
68 for ( int remaining = cursor.getRemaining(); remaining > 0; )
69 {
70 // Optimization: prefer int comparisons over byte comparisons
71 if ( remaining >= 4 )
72 {
73 int i = cursor.getInt();
74 int otherI = otherCursor.getInt();
75 if ( i != otherI )
76 {
77 return false;
78 }
79 }
80 else
81 {
82 byte b = cursor.get();
83 byte otherB = otherCursor.get();
84 if ( b != otherB )
85 {
86 return false;
87 }
88 }
89 }
90 return true;
91 }
92
93 }