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Java > Open Source Codes > com > opensymphony > webwork > components > template > FreemarkerTemplateEngine


1 /*
2  * Created on 3/03/2005
3  *
4  */
5 package com.opensymphony.webwork.components.template;
6
7 import com.opensymphony.webwork.ServletActionContext;
8 import com.opensymphony.webwork.views.freemarker.FreemarkerManager;
9 import com.opensymphony.xwork.ActionContext;
10 import com.opensymphony.xwork.ActionInvocation;
11 import com.opensymphony.xwork.util.OgnlValueStack;
12 import freemarker.template.Configuration;
13 import freemarker.template.SimpleHash;
14 import org.apache.commons.logging.Log;
15 import org.apache.commons.logging.LogFactory;
16
17 import javax.servlet.ServletContext JavaDoc;
18 import javax.servlet.http.HttpServletRequest JavaDoc;
19 import javax.servlet.http.HttpServletResponse JavaDoc;
20 import java.io.IOException JavaDoc;
21 import java.util.Iterator JavaDoc;
22 import java.util.List JavaDoc;
23 import java.util.Map JavaDoc;
24
25 /**
26  * @author CameronBraid
27  */
28 public class FreemarkerTemplateEngine extends BaseTemplateEngine {
29
30     private static final Log LOG = LogFactory.getLog(FreemarkerTemplateEngine.class);
31
32     public void renderTemplate(TemplateRenderingContext templateContext) throws Exception JavaDoc {
33         // get the various items required from the stack
34 OgnlValueStack stack = templateContext.getStack();
35         Map JavaDoc context = stack.getContext();
36         ServletContext JavaDoc servletContext = (ServletContext JavaDoc) context.get(ServletActionContext.SERVLET_CONTEXT);
37         HttpServletRequest JavaDoc req = (HttpServletRequest JavaDoc) context.get(ServletActionContext.HTTP_REQUEST);
38         HttpServletResponse JavaDoc res = (HttpServletResponse JavaDoc) context.get(ServletActionContext.HTTP_RESPONSE);
39
40         // prepare freemarker
41 FreemarkerManager freemarkerManager = FreemarkerManager.getInstance();
42         Configuration config = freemarkerManager.getConfigruation(servletContext);
43
44         // get the list of templates we can use
45 List JavaDoc templates = templateContext.getTemplate().getPossibleTemplates(this);
46
47         // find the right template
48 freemarker.template.Template template = null;
49         String JavaDoc templateName = null;
50         Exception JavaDoc exception = null;
51         for (Iterator JavaDoc iterator = templates.iterator(); iterator.hasNext();) {
52             Template t = (Template) iterator.next();
53             templateName = getFinalTemplateName(t);
54             try {
55                 // try to load, and if it works, stop at the first one
56 template = config.getTemplate(templateName);
57                 break;
58             } catch (IOException JavaDoc e) {
59                 if (exception == null) {
60                     exception = e;
61                 }
62             }
63         }
64
65         if (template == null) {
66             LOG.error("Could not load template " + templateContext.getTemplate());
67             if (exception != null) {
68                 throw exception;
69             } else {
70                 return;
71             }
72         }
73
74         if (LOG.isDebugEnabled()) {
75             LOG.debug("Rendering template " + templateName);
76         }
77
78         ActionInvocation ai = ActionContext.getContext().getActionInvocation();
79
80         Object JavaDoc action = (ai == null) ? null : ai.getAction();
81         SimpleHash model = freemarkerManager.buildTemplateModel(stack, action, servletContext, req, res, config.getObjectWrapper());
82
83         model.put("tag", templateContext.getTag());
84         model.put("parameters", templateContext.getParameters());
85
86         template.process(model, templateContext.getWriter());
87     }
88
89     protected String JavaDoc getSuffix() {
90         return "ftl";
91     }
92 }
93
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