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