[jboss-dev-forums] [JBoss AS 7 Development] - Possible ThymeLeaf Integration

[Ondrej Zizka]

Ondrej Zizka [https://community.jboss.org/people/ozizka] modified the document:

"Possible ThymeLeaf Integration"

To view the document, visit: https://community.jboss.org/docs/DOC-48038

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ThymeLeaf is a templating engine.
 http://www.thymeleaf.org/documentation.html http://www.thymeleaf.org/documentation.html

h2. Possible integration points
h4. In CDI, even standalone:

*  http://www.thymeleaf.org/apidocs/thymeleaf/2.0.14/org/thymeleaf/context/IContext.html IContext - the map of values available for the template. Those could be filled from CDI.
          @Inject CDIThymeContext ctx;


          By default, ThymeLeaf uses OGNL against the map of variables to resolve the expressions.

          The interface IContext has only  *http://127.0.0.1:8082/resource/jar%3Afile%3A/home/ondra/.m2/repository/org/thymeleaf/thymeleaf/2.0.14/thymeleaf-2.0.14-javadoc.jar%21/org/thymeleaf/context/IContext.html#getVariables%28%29 getVariables*(), so the values are not resolved per case - whole map needs to be given at the time of this call.  https://github.com/thymeleaf/thymeleaf/issues/101 RFE
          Therefore, the map provided by CDIThymeContext would probably have to 
** list all beans CDI could deliver, limited to those marked as beans somehow (i.e. not "any class"),
** override the methods of VariablesMap which ThymeLeaf actually uses, and look up the beans lazily.* Unfortunatelly, this wouldn't work:

*** java.lang.UnsupportedOperationException
    at cz.oz.thymeleaftry.cdi.LazyVariablesMap.size(LazyVariablesMap.java:27)
    at java.util.HashMap.putAll(HashMap.java:597)
    at org.thymeleaf.context.AbstractProcessingContext.createEvaluationRoot(AbstractProcessingContext.java:95)


* Also, we could make the template names type-safe, by introducing one qualifier per page.
          // Inject object with the template "Home", the template engine, and CDIThymeContext.
          @Inject @Template @Home  ThymeTemplate tpl;
 
          // Additional variables.
          tpl.getContext().setVariable("foo", bar);
 
          // Process.
          tpl.process( response.getWriter() );


h4. Additionally, in Application Server: 

*  http://www.thymeleaf.org/apidocs/thymeleaf/2.0.14/org/thymeleaf/resourceresolver/IResourceResolver.html IResourceResolver - to load resources from deployments. ThymeLeaf's ClassLoaderResourceResolver uses just
 ClassLoaderUtils.getClassLoader(ClassLoaderResourceResolver.class).getResourceAsStream(resourceName);


*  http://www.thymeleaf.org/apidocs/thymeleaf/2.0.14/org/thymeleaf/cache/ICacheManager.html ICacheManager - use InfiniSpan as cache.

* @Resource TemplateEngine templateEngine;   - inject template engine configured as module. (Probably not much useful, ThymeLeaf is pretty simple, almost no config.)

*  http://www.thymeleaf.org/apidocs/thymeleaf/2.0.14/org/thymeleaf/messageresolver/IMessageResolver.html IMessageResolver - anything useful to get the strings from?
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