1 /***
2 *
3 * Copyright 2004 Hiram Chirino
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
6 * use this file except in compliance with the License. You may obtain a copy of
7 * the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
13 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
14 * License for the specific language governing permissions and limitations under
15 * the License.
16 */
17 package org.activeio.packet;
18
19 import java.io.DataOutput;
20 import java.io.IOException;
21 import java.io.OutputStream;
22
23 import org.activeio.Packet;
24
25 /***
26 * Provides a Packet implementation that filters operations to another packet.
27 *
28 * Used to make it easier to augment the {@see #narrow(Class)}method.
29 *
30 * @version $Revision$
31 */
32 public abstract class FilterPacket implements Packet {
33 final protected Packet next;
34
35 public FilterPacket(Packet next) {
36 this.next = next;
37 }
38
39 public ByteSequence asByteSequence() {
40 return next.asByteSequence();
41 }
42
43 public int capacity() {
44 return next.capacity();
45 }
46
47 public void clear() {
48 next.clear();
49 }
50
51 public void flip() {
52 next.flip();
53 }
54
55 public boolean hasRemaining() {
56 return next.hasRemaining();
57 }
58
59 public int limit() {
60 return next.limit();
61 }
62
63 public void limit(int limit) {
64 next.limit(limit);
65 }
66
67 public Object narrow(Class target) {
68 if( target.isAssignableFrom(getClass()) ) {
69 return this;
70 }
71 return next.narrow(target);
72 }
73
74 public int position() {
75 return next.position();
76 }
77
78 public void position(int position) {
79 next.position(position);
80 }
81
82 public int read() {
83 return next.read();
84 }
85
86 public int read(byte[] data, int offset, int length) {
87 return next.read(data, offset, length);
88 }
89
90 public int read(Packet dest) {
91 return next.read(dest);
92 }
93
94 public int remaining() {
95 return next.remaining();
96 }
97
98 public void rewind() {
99 next.rewind();
100 }
101
102 public byte[] sliceAsBytes() {
103 return next.sliceAsBytes();
104 }
105
106 public int write(byte[] data, int offset, int length) {
107 return next.write(data, offset, length);
108 }
109
110 public boolean write(int data) {
111 return next.write(data);
112 }
113
114 public void writeTo(OutputStream out) throws IOException {
115 next.writeTo(out);
116 }
117 public void writeTo(DataOutput out) throws IOException {
118 next.writeTo(out);
119 }
120
121 public Object duplicate(ClassLoader cl) throws IOException {
122 return next.duplicate(cl);
123 }
124
125 public Packet duplicate() {
126 return filter(next.duplicate());
127 }
128
129 public Packet slice() {
130 return filter(next.slice());
131 }
132
133 public void dispose() {
134 next.dispose();
135 }
136
137 abstract public Packet filter(Packet packet);
138 }