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 }