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.filter.codec;
21
22 import java.util.Queue;
23
24 import org.apache.mina.core.buffer.IoBuffer;
25 import org.apache.mina.util.CircularQueue;
26
27 /**
28 * A {@link ProtocolEncoderOutput} based on queue.
29 *
30 * @author The Apache MINA Project (dev@mina.apache.org)
31 * @version $Rev: 671827 $, $Date: 2008-06-26 10:49:48 +0200 (jeu, 26 jun 2008) $
32 */
33 public abstract class AbstractProtocolEncoderOutput implements
34 ProtocolEncoderOutput {
35 private final Queue<Object> messageQueue = new CircularQueue<Object>();
36 private boolean buffersOnly = true;
37
38 public AbstractProtocolEncoderOutput() {
39 }
40
41 public Queue<Object> getMessageQueue() {
42 return messageQueue;
43 }
44
45 public void write(Object encodedMessage) {
46 if (encodedMessage instanceof IoBuffer) {
47 IoBuffer buf = (IoBuffer) encodedMessage;
48 if (buf.hasRemaining()) {
49 messageQueue.offer(buf);
50 } else {
51 throw new IllegalArgumentException(
52 "buf is empty. Forgot to call flip()?");
53 }
54 } else {
55 messageQueue.offer(encodedMessage);
56 buffersOnly = false;
57 }
58 }
59
60 public void mergeAll() {
61 if (!buffersOnly) {
62 throw new IllegalStateException(
63 "the encoded message list contains a non-buffer.");
64 }
65
66 final int size = messageQueue.size();
67
68 if (size < 2) {
69 // no need to merge!
70 return;
71 }
72
73 // Get the size of merged BB
74 int sum = 0;
75 for (Object b : messageQueue) {
76 sum += ((IoBuffer) b).remaining();
77 }
78
79 // Allocate a new BB that will contain all fragments
80 IoBuffer newBuf = IoBuffer.allocate(sum);
81
82 // and merge all.
83 for (; ;) {
84 IoBuffer buf = (IoBuffer) messageQueue.poll();
85 if (buf == null) {
86 break;
87 }
88
89 newBuf.put(buf);
90 }
91
92 // Push the new buffer finally.
93 newBuf.flip();
94 messageQueue.add(newBuf);
95 }
96 }