Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
DefaultPage |
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| 2.0;2 |
1 | package org.apache.turbine.modules.pages; | |
2 | ||
3 | ||
4 | /* | |
5 | * Licensed to the Apache Software Foundation (ASF) under one | |
6 | * or more contributor license agreements. See the NOTICE file | |
7 | * distributed with this work for additional information | |
8 | * regarding copyright ownership. The ASF licenses this file | |
9 | * to you under the Apache License, Version 2.0 (the | |
10 | * "License"); you may not use this file except in compliance | |
11 | * with the License. You may obtain a copy of the License at | |
12 | * | |
13 | * http://www.apache.org/licenses/LICENSE-2.0 | |
14 | * | |
15 | * Unless required by applicable law or agreed to in writing, | |
16 | * software distributed under the License is distributed on an | |
17 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
18 | * KIND, either express or implied. See the License for the | |
19 | * specific language governing permissions and limitations | |
20 | * under the License. | |
21 | */ | |
22 | ||
23 | ||
24 | import org.apache.commons.lang3.StringUtils; | |
25 | import org.apache.logging.log4j.LogManager; | |
26 | import org.apache.logging.log4j.Logger; | |
27 | import org.apache.turbine.annotation.TurbineLoader; | |
28 | import org.apache.turbine.modules.Action; | |
29 | import org.apache.turbine.modules.ActionLoader; | |
30 | import org.apache.turbine.modules.Layout; | |
31 | import org.apache.turbine.modules.LayoutLoader; | |
32 | import org.apache.turbine.modules.Page; | |
33 | import org.apache.turbine.modules.Screen; | |
34 | import org.apache.turbine.modules.ScreenLoader; | |
35 | import org.apache.turbine.pipeline.PipelineData; | |
36 | import org.apache.turbine.util.RunData; | |
37 | ||
38 | /** | |
39 | * When building sites using templates, Screens need only be defined | |
40 | * for templates which require dynamic (database or object) data. | |
41 | * | |
42 | * <p> | |
43 | * | |
44 | * This page can be used on sites where the number of Screens can be | |
45 | * much less than the number of templates. The templates can be | |
46 | * grouped in directories with common layouts. Screen modules are | |
47 | * then expected to be placed in packages corresponding with the | |
48 | * templates' directories and follow a specific naming scheme. | |
49 | * | |
50 | * <p> | |
51 | * | |
52 | * The template parameter is parsed and and a Screen whose package | |
53 | * matches the templates path and shares the same name minus any | |
54 | * extension and beginning with a capital letter is searched for. If | |
55 | * not found, a Screen in a package matching the template's path with | |
56 | * name Default is searched for. If still not found, a Screen with | |
57 | * name Default is looked for in packages corresponding to parent | |
58 | * directories in the template's path until a match is found. | |
59 | * | |
60 | * <p> | |
61 | * | |
62 | * For example if data.getParameters().getString("template") returns | |
63 | * /about_us/directions/driving.wm, the search follows | |
64 | * about_us.directions.Driving, about_us.directions.Default, | |
65 | * about_us.Default, Default, VelocitySiteScreen. | |
66 | * | |
67 | * <p> | |
68 | * | |
69 | * Only one Layout module is used, since it is expected that any | |
70 | * dynamic content will be placed in navigations and screens. The | |
71 | * layout template to be used is found in a similar way to the Screen. | |
72 | * For example the following paths will be searched in the layouts | |
73 | * subdirectory: /about_us/directions/driving.wm, | |
74 | * /about_us/directions/default.wm, /about_us/default.wm, /default.wm. | |
75 | * | |
76 | * <p> | |
77 | * | |
78 | * This approach allows a site with largely static content to be | |
79 | * updated and added to regularly by those with little Java | |
80 | * experience. | |
81 | * | |
82 | * <p> | |
83 | * | |
84 | * The code is an almost a complete clone of the FreeMarkerSitePage | |
85 | * written by John McNally. I've only modified it for Template use. | |
86 | * | |
87 | * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a> | |
88 | * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> | |
89 | * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a> | |
90 | * @version $Id: DefaultPage.java 1854797 2019-03-04 20:41:39Z tv $ | |
91 | */ | |
92 | 12 | public class DefaultPage implements Page |
93 | { | |
94 | /** Logging */ | |
95 | 12 | protected final Logger log = LogManager.getLogger(this.getClass()); |
96 | ||
97 | /** Injected loader instance */ | |
98 | @TurbineLoader( Action.class ) | |
99 | protected ActionLoader actionLoader; | |
100 | ||
101 | /** Injected loader instance */ | |
102 | @TurbineLoader( Screen.class ) | |
103 | protected ScreenLoader screenLoader; | |
104 | ||
105 | /** Injected loader instance */ | |
106 | @TurbineLoader( Layout.class ) | |
107 | protected LayoutLoader layoutLoader; | |
108 | ||
109 | /** | |
110 | * Builds the Page. | |
111 | * | |
112 | * @param pipelineData Turbine information. | |
113 | * @throws Exception a generic exception. | |
114 | */ | |
115 | @Override | |
116 | public void doBuild(PipelineData pipelineData) | |
117 | throws Exception | |
118 | { | |
119 | 12 | RunData data = pipelineData.getRunData(); |
120 | // Template pages can use this to set up the context, so it is | |
121 | // available to the Action and Screen. It does nothing here. | |
122 | 12 | doBuildBeforeAction(pipelineData); |
123 | ||
124 | // If an action has been defined, execute it here. Actions | |
125 | // can re-define the template definition. | |
126 | 12 | if (data.hasAction()) |
127 | { | |
128 | 6 | actionLoader.exec(pipelineData, data.getAction()); |
129 | } | |
130 | ||
131 | // if a redirect was setup in data, don't do anything else | |
132 | 12 | if (StringUtils.isNotEmpty(data.getRedirectURI())) |
133 | { | |
134 | 0 | return; |
135 | } | |
136 | ||
137 | // Template pages can use this to set up default templates and | |
138 | // associated class modules. It does nothing here. | |
139 | 12 | doBuildAfterAction(pipelineData); |
140 | ||
141 | 12 | String screenName = data.getScreen(); |
142 | ||
143 | 12 | log.debug("Building {}", screenName); |
144 | ||
145 | // Ask the Screen for its Layout and then execute the Layout. | |
146 | // The Screen can override the getLayout() method to re-define | |
147 | // the Layout depending on data passed in via the | |
148 | // data.parameters object. | |
149 | 12 | Screen aScreen = screenLoader.getAssembler(screenName); |
150 | 12 | String layout = aScreen.getLayout(pipelineData); |
151 | ||
152 | // If the Layout has been set to be null, attempt to execute | |
153 | // the Screen that has been defined. | |
154 | 12 | if (layout != null) |
155 | { | |
156 | 12 | layoutLoader.exec(pipelineData, layout); |
157 | } | |
158 | else | |
159 | { | |
160 | 0 | screenLoader.exec(pipelineData, screenName); |
161 | } | |
162 | ||
163 | // Do any post build actions (overridable by subclasses - | |
164 | // does nothing here). | |
165 | 6 | doPostBuild(pipelineData); |
166 | 6 | } |
167 | ||
168 | /** | |
169 | * Can be used by template Pages to stuff the Context into the | |
170 | * PipelineData so that it is available to the Action module and the | |
171 | * Screen module via getContext(). It does nothing here. | |
172 | * | |
173 | * @param pipelineData Turbine information. | |
174 | * @throws Exception a generic exception. | |
175 | */ | |
176 | protected void doBuildBeforeAction(PipelineData pipelineData) | |
177 | throws Exception | |
178 | { | |
179 | // do nothing by default | |
180 | 3 | } |
181 | ||
182 | /** | |
183 | * Can be overridden by template Pages to set up data needed to | |
184 | * process a template. It does nothing here. | |
185 | * | |
186 | * @param pipelineData Turbine information. | |
187 | * @throws Exception a generic exception. | |
188 | */ | |
189 | protected void doBuildAfterAction(PipelineData pipelineData) | |
190 | throws Exception | |
191 | { | |
192 | // do nothing by default | |
193 | 3 | } |
194 | ||
195 | /** | |
196 | * Can be overridden to perform actions when the request is | |
197 | * fully processed. It does nothing here. | |
198 | * | |
199 | * @param pipelineData Turbine information. | |
200 | * @throws Exception a generic exception. | |
201 | */ | |
202 | protected void doPostBuild(PipelineData pipelineData) | |
203 | throws Exception | |
204 | { | |
205 | // do nothing by default | |
206 | 0 | } |
207 | } |