Template Engine & Rendering

interface DDMTemplateManager {
    Map<String, Object> getAutocompleteVariables(
        HttpServletRequest httpServletRequest, 
        HttpServletResponse httpServletResponse, 
        Language language) throws Exception;
        
    String[] getRestrictedVariables(Language language);
    
    boolean isAutocompleteEnabled(Language language);
}

enum Language {
    FREEMARKER("ftl"),
    VELOCITY("vm"),
    JAVASCRIPT("js");
    
    String getExtension();
}

interface DDMDisplay {
    String getEditTemplateBackURL(HttpServletRequest httpServletRequest, 
        DDMTemplate template) throws PortalException;
        
    String getViewTemplateBackURL(HttpServletRequest httpServletRequest, 
        DDMTemplate template) throws PortalException;
        
    boolean isShowConfirmSelectStructure();
    boolean isShowConfirmSelectTemplate();
}

@Component
public class TemplateExample {
    
    @Reference
    private DDMTemplateLocalService templateLocalService;
    
    public DDMTemplate createDisplayTemplate(long groupId, long structureId, long userId) 
        throws PortalException {
        
        String script = 
            "<#list entries as entry>" +
            "  <div class=\"entry\">" +
            "    <h3>${entry.title}</h3>" +
            "    <p>${entry.description}</p>" +
            "  </div>" +
            "</#list>";
            
        Map<Locale, String> nameMap = Collections.singletonMap(Locale.US, "Entry Display Template");
        Map<Locale, String> descriptionMap = Collections.singletonMap(Locale.US, "Template for displaying entries");
        
        ServiceContext serviceContext = new ServiceContext();
        serviceContext.setScopeGroupId(groupId);
        
        return templateLocalService.addTemplate(
            userId, groupId,
            PortalUtil.getClassNameId(DDMStructure.class), structureId,
            PortalUtil.getClassNameId(DDMTemplate.class),
            null, // auto-generate template key
            nameMap, descriptionMap,
            DDMTemplateConstants.TEMPLATE_TYPE_DISPLAY,
            DDMTemplateConstants.TEMPLATE_MODE_CREATE,
            Language.FREEMARKER.getValue(),
            script, true, // cacheable
            false, null, null, // no small image
            serviceContext
        );
    }
}