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.stream;
21
22 import java.io.IOException;
23 import java.io.InputStream;
24
25 import org.apache.mina.core.buffer.IoBuffer;
26 import org.apache.mina.core.filterchain.IoFilter;
27
28 /**
29 * Filter implementation which makes it possible to write {@link InputStream}
30 * objects directly using {@link IoSession#write(Object)}. When an
31 * {@link InputStream} is written to a session this filter will read the bytes
32 * from the stream into {@link IoBuffer} objects and write those buffers
33 * to the next filter. When end of stream has been reached this filter will
34 * call {@link IoFilter.NextFilter#messageSent(IoSession,WriteRequest)} using the original
35 * {@link InputStream} written to the session and notifies
36 * {@link org.apache.mina.core.future.WriteFuture} on the
37 * original {@link org.apache.mina.core.write.WriteRequest}.
38 * <p/>
39 * This filter will ignore written messages which aren't {@link InputStream}
40 * instances. Such messages will be passed to the next filter directly.
41 * </p>
42 * <p/>
43 * NOTE: this filter does not close the stream after all data from stream
44 * has been written. The {@link org.apache.mina.core.service.IoHandler} should take
45 * care of that in its
46 * {@link org.apache.mina.core.service.IoHandler#messageSent(IoSession,Object)}
47 * callback.
48 * </p>
49 *
50 * @author The Apache MINA Project (dev@mina.apache.org)
51 * @org.apache.xbean.XBean
52 */
53 public class StreamWriteFilter extends AbstractStreamWriteFilter<InputStream> {
54
55 @Override
56 protected IoBuffer getNextBuffer(InputStream is) throws IOException {
57 byte[] bytes = new byte[getWriteBufferSize()];
58
59 int off = 0;
60 int n = 0;
61 while (off < bytes.length
62 && (n = is.read(bytes, off, bytes.length - off)) != -1) {
63 off += n;
64 }
65
66 if (n == -1 && off == 0) {
67 return null;
68 }
69
70 IoBuffer buffer = IoBuffer.wrap(bytes, 0, off);
71
72 return buffer;
73 }
74
75 @Override
76 protected Class<InputStream> getMessageClass() {
77 return InputStream.class;
78 }
79
80 }