1 /***
2 *
3 * Copyright 2004 Hiram Chirino
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of 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,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 **/
18 package org.activeio.adapter;
19
20 import java.io.IOException;
21 import java.io.OutputStream;
22
23 import org.activeio.Packet;
24 import org.activeio.packet.AppendedPacket;
25 import org.activeio.packet.ByteArrayPacket;
26
27 /***
28 *
29 */
30 final public class PacketByteArrayOutputStream extends OutputStream {
31
32 private Packet result;
33 private Packet current;
34 int nextAllocationSize=0;
35
36 public PacketByteArrayOutputStream() {
37 this( 1024 );
38 }
39
40 public PacketByteArrayOutputStream(int initialSize) {
41 nextAllocationSize = initialSize;
42 current = allocate();
43 }
44
45 protected Packet allocate() {
46 ByteArrayPacket packet = new ByteArrayPacket(new byte[nextAllocationSize]);
47 nextAllocationSize <<= 3;
48 return packet;
49 }
50
51 public void skip(int size) {
52 while( size > 0 ) {
53 if( !current.hasRemaining() ) {
54 allocatedNext();
55 }
56
57 int skip = ((size <= current.remaining()) ? size : current.remaining());
58 current.position(current.position()+skip);
59 size -= skip;
60 }
61 }
62
63 public void write(int b) throws IOException {
64 if( !current.hasRemaining() ) {
65 allocatedNext();
66 }
67 current.write(b);
68 }
69
70 public void write(byte[] b, int off, int len) throws IOException {
71 while( len > 0 ) {
72 if( !current.hasRemaining() ) {
73 allocatedNext();
74 }
75 int wrote = current.write(b,off,len);
76 off+=wrote;
77 len-=wrote;
78 }
79 }
80
81 private void allocatedNext() {
82 if( result == null ) {
83 current.flip();
84 result = current;
85 } else {
86 current.flip();
87 result = AppendedPacket.join(result, current);
88 }
89 current = allocate();
90 }
91
92 public Packet getPacket() {
93 if( result == null ) {
94 current.flip();
95 return current.slice();
96 } else {
97 current.flip();
98 return AppendedPacket.join(result, current);
99 }
100 }
101
102 public void reset() {
103 result = null;
104 current.clear();
105 }
106
107 public int position() {
108 return current.position() + (result==null ? 0 : result.remaining());
109 }
110 }