1 /*
2 * Copyright 2009 Red Hat, Inc.
3 *
4 * Red Hat licenses this file to you under the Apache License, version 2.0
5 * (the "License"); you may not use this file except in compliance with the
6 * License. You may obtain a copy of the License at:
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package org.jboss.netty.handler.codec.embedder;
17
18 import static org.jboss.netty.channel.Channels.*;
19
20 import org.jboss.netty.buffer.ChannelBuffer;
21 import org.jboss.netty.buffer.ChannelBufferFactory;
22 import org.jboss.netty.buffer.ChannelBuffers;
23 import org.jboss.netty.channel.ChannelPipeline;
24 import org.jboss.netty.channel.ChannelUpstreamHandler;
25 import org.jboss.netty.handler.codec.base64.Base64Decoder;
26 import org.jboss.netty.handler.codec.string.StringDecoder;
27
28 /**
29 * A helper that wraps a decoder so that it can be used without doing actual
30 * I/O in unit tests or higher level codecs. For example, you can decode a
31 * Base64-encoded {@link ChannelBuffer} with {@link Base64Decoder} and
32 * {@link StringDecoder} without setting up the {@link ChannelPipeline} and
33 * other mock objects by yourself:
34 * <pre>
35 * {@link ChannelBuffer} base64Data = {@link ChannelBuffers}.copiedBuffer("Zm9vYmFy", CharsetUtil.US_ASCII);
36 *
37 * {@link DecoderEmbedder}<String> embedder = new {@link DecoderEmbedder}<String>(
38 * new {@link Base64Decoder}(), new {@link StringDecoder}());
39 *
40 * embedder.offer(base64Data);
41 *
42 * String decoded = embedder.poll();
43 * assert decoded.equals("foobar");
44 * </pre>
45 *
46 * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
47 * @author <a href="http://gleamynode.net/">Trustin Lee</a>
48 * @version $Rev: 2122 $, $Date: 2010-02-02 11:00:04 +0900 (Tue, 02 Feb 2010) $
49 *
50 * @apiviz.landmark
51 * @see EncoderEmbedder
52 */
53 public class DecoderEmbedder<E> extends AbstractCodecEmbedder<E> {
54
55 /**
56 * Creates a new embedder whose pipeline is composed of the specified
57 * handlers.
58 */
59 public DecoderEmbedder(ChannelUpstreamHandler... handlers) {
60 super(handlers);
61 }
62
63 /**
64 * Creates a new embedder whose pipeline is composed of the specified
65 * handlers.
66 *
67 * @param bufferFactory the {@link ChannelBufferFactory} to be used when
68 * creating a new buffer.
69 */
70 public DecoderEmbedder(ChannelBufferFactory bufferFactory, ChannelUpstreamHandler... handlers) {
71 super(bufferFactory, handlers);
72 }
73
74 public boolean offer(Object input) {
75 fireMessageReceived(getChannel(), input);
76 return !super.isEmpty();
77 }
78 }