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org.apache.turbine.modules.screens.BaseJspScreen |
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1 | package org.apache.turbine.modules.screens; |
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2 | ||
3 | /* |
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4 | * Copyright 2001-2005 The Apache Software Foundation. |
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5 | * |
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6 | * Licensed under the Apache License, Version 2.0 (the "License") |
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7 | * you may not use this file except in compliance with the License. |
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8 | * You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | ||
19 | import org.apache.commons.lang.StringUtils; |
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20 | ||
21 | import org.apache.ecs.ConcreteElement; |
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22 | ||
23 | import org.apache.turbine.TurbineConstants; |
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24 | import org.apache.turbine.services.jsp.TurbineJsp; |
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25 | import org.apache.turbine.services.template.TurbineTemplate; |
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26 | import org.apache.turbine.util.RunData; |
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27 | ||
28 | /** |
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29 | * Base JSP Screen that should be subclassed by screens that want to |
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30 | * use JSP. Subclasses should override the doBuildTemplate() method. |
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31 | * |
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32 | * @author <a href="mailto:john.mcnally@clearink.com">John D. McNally</a> |
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33 | * @author Frank Y. Kim |
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34 | * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> |
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35 | * @version $Id: BaseJspScreen.java 264148 2005-08-29 14:21:04Z henning $ |
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36 | */ |
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37 | 0 | public class BaseJspScreen |
38 | extends TemplateScreen |
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39 | { |
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40 | /** The prefix for lookup up screen pages */ |
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41 | 0 | private String prefix = TurbineConstants.SCREEN_PREFIX + "/"; |
42 | ||
43 | /** |
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44 | * Method that sets up beans and forward the request to the JSP. |
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45 | * |
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46 | * @param data Turbine information. |
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47 | * @return null - the JSP sends the information. |
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48 | * @exception Exception, a generic exception. |
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49 | */ |
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50 | public ConcreteElement buildTemplate(RunData data) |
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51 | throws Exception |
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52 | { |
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53 | 0 | String screenTemplate = data.getTemplateInfo().getScreenTemplate(); |
54 | // get the name of the JSP we want to use |
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55 | 0 | String templateName |
56 | = TurbineTemplate.getScreenTemplateName(screenTemplate); |
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57 | ||
58 | // The Template Service could not find the Screen |
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59 | 0 | if (StringUtils.isEmpty(templateName)) |
60 | { |
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61 | 0 | log.error("Screen " + screenTemplate + " not found!"); |
62 | 0 | throw new Exception("Could not find screen for " + screenTemplate); |
63 | } |
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64 | ||
65 | // let service know whether we are using a layout |
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66 | 0 | TurbineJsp.handleRequest(data, prefix + templateName, |
67 | getLayout(data) == null); |
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68 | ||
69 | 0 | return null; |
70 | } |
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71 | ||
72 | /** |
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73 | * Method to be overidden by subclasses to include data in beans, etc. |
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74 | * |
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75 | * @param data, the Rundata object |
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76 | * @exception Exception, a generic exception. |
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77 | */ |
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78 | protected void doBuildTemplate(RunData data) |
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79 | throws Exception |
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80 | { |
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81 | 0 | } |
82 | } |
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