Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
RawScreen |
|
| 1.0;1 |
1 | package org.apache.turbine.modules.screens; | |
2 | ||
3 | /* | |
4 | * Licensed to the Apache Software Foundation (ASF) under one | |
5 | * or more contributor license agreements. See the NOTICE file | |
6 | * distributed with this work for additional information | |
7 | * regarding copyright ownership. The ASF licenses this file | |
8 | * to you under the Apache License, Version 2.0 (the | |
9 | * "License"); you may not use this file except in compliance | |
10 | * with the License. You may obtain a copy of the License at | |
11 | * | |
12 | * http://www.apache.org/licenses/LICENSE-2.0 | |
13 | * | |
14 | * Unless required by applicable law or agreed to in writing, | |
15 | * software distributed under the License is distributed on an | |
16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
17 | * KIND, either express or implied. See the License for the | |
18 | * specific language governing permissions and limitations | |
19 | * under the License. | |
20 | */ | |
21 | ||
22 | ||
23 | // Turbine stuff. | |
24 | ||
25 | import org.apache.turbine.modules.Screen; | |
26 | import org.apache.turbine.pipeline.PipelineData; | |
27 | import org.apache.turbine.util.RunData; | |
28 | ||
29 | /** | |
30 | * Base class for writing Screens that output binary data. This class | |
31 | * is provided as a helper class for those who want to write Screens | |
32 | * that output raw binary data. For example, it may be extended into | |
33 | * a Screen that outputs a SVG file or a SWF (Flash Player format) | |
34 | * movie. The only thing one has to do is to implement the two | |
35 | * methods <code>getContentType(PipelineData data)</code> and | |
36 | * <code>doOutput(PipelineData data)</code> (see below). | |
37 | * | |
38 | * <p> You might want to take a look at the ImageServer screen class | |
39 | * contained in the TDK.<br> | |
40 | * | |
41 | * @author <a href="mailto:rkoenig@chez.com">Regis Koenig</a> | |
42 | * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a> | |
43 | * @version $Id: RawScreen.java 1854797 2019-03-04 20:41:39Z tv $ | |
44 | */ | |
45 | 0 | public abstract class RawScreen implements Screen |
46 | { | |
47 | /** | |
48 | * Build the Screen. This method actually makes a call to the | |
49 | * doOutput() method in order to generate the Screen content. | |
50 | * | |
51 | * @param pipelineData Turbine information. | |
52 | * @return A ConcreteElement. | |
53 | * @throws Exception a generic exception. | |
54 | */ | |
55 | @Override | |
56 | public final String doBuild(PipelineData pipelineData) | |
57 | throws Exception | |
58 | { | |
59 | 0 | RunData data = pipelineData.getRunData(); |
60 | 0 | data.getResponse().setContentType(getContentType(pipelineData)); |
61 | 0 | data.declareDirectResponse(); |
62 | 0 | doOutput(pipelineData); |
63 | 0 | return null; |
64 | } | |
65 | ||
66 | /** | |
67 | * Set the content type. This method should be overridden to | |
68 | * actually set the real content-type header of the output. | |
69 | * | |
70 | * @param pipelineData Turbine information. | |
71 | * @return A String with the content type. | |
72 | */ | |
73 | protected abstract String getContentType(PipelineData pipelineData); | |
74 | ||
75 | /** | |
76 | * Actually output the dynamic content. The OutputStream can be | |
77 | * accessed like this: <pre>OutputStream out = | |
78 | * data.getResponse().getOutputStream();</pre>. | |
79 | * | |
80 | * @param pipelineData Turbine information. | |
81 | * @throws Exception a generic exception. | |
82 | */ | |
83 | protected abstract void doOutput(PipelineData pipelineData) throws Exception; | |
84 | ||
85 | /** | |
86 | * The layout must be set to null. | |
87 | * | |
88 | * @param pipelineData Turbine information. | |
89 | * @return A null String. | |
90 | */ | |
91 | @Override | |
92 | public final String getLayout(PipelineData pipelineData) | |
93 | { | |
94 | 0 | return null; |
95 | } | |
96 | } |