Java Code Examples for com.github.jknack.handlebars.io.TemplateLoader

static Handlebars create(final List<TemplateLoader> templateLoaders, final I18nResolver i18NResolver, final I18nIdentifierFactory i18nIdentifierFactory) {
    if (templateLoaders.isEmpty()) {
        throw new SunriseConfigurationException("Could not initialize Handlebars due to missing template loaders configuration", CONFIG_TEMPLATE_LOADERS);
    }
    logger.info("Provide Handlebars: template loaders [{}]]",
            templateLoaders.stream().map(TemplateLoader::getPrefix).collect(joining(", ")));
    final TemplateLoader[] loaders = templateLoaders.toArray(new TemplateLoader[templateLoaders.size()]);
    final Handlebars handlebars = new Handlebars()
            .with(loaders)
            .with(new HighConcurrencyTemplateCache())
            .infiniteLoops(true);
    handlebars.registerHelper("i18n", new HandlebarsI18nHelper(i18NResolver, i18nIdentifierFactory));
    handlebars.registerHelper("cms", new HandlebarsCmsHelper());
    handlebars.registerHelper("json", new HandlebarsJsonHelper<>());
    return handlebars;
}
 

@Test
public void testTemplatesCompile() throws Exception {
   TemplateLoader loader = new IrisResourceLoader("templates", 0);
   Handlebars handlebars = 
         new Handlebars(loader)
            .registerHelper(EnumHelper.NAME, EnumHelper.INSTANCE)
            .registerHelpers(HandlebarsHelpersSource.class)
            .registerHelper(IfEqualHelper.NAME, IfEqualHelper.INSTANCE)
            .registerHelpers(StringHelpers.class);
   Validator v = new Validator();
   String templateDir =
         Resources
            .getResource("templates")
            .getUri()
            .toURL()
            .getPath();
   for(File template: new File(templateDir).listFiles((file) -> file != null && file.getName() != null && file.getName().endsWith(".hbs"))) {
      try {
         String name = template.getName();
         name = name.substring(0, name.length() - 4);
         Template tpl = handlebars.compile(name);
         if(name.endsWith("-email")) {
            // TODO validate email xml
            continue;
         }
         
         String body  = tpl.apply(Context.newContext(Collections.emptyMap()));
         JSON.fromJson(body, Map.class);
      }
      catch(Exception e) {
         e.printStackTrace();
         v.error("Failed to compile: " + template.getName() + " -- " + e.getMessage());
      }
   }
   v.throwIfErrors();
}
 

private void init(String prefix, int cacheSize){
	LOGGER.info("Handlebars Template Service Initialization with a location of {} and cache size of {}",prefix,cacheSize);
	templateCache = new ConcurrentMapTemplateCache();		
	
	TemplateLoader loader=new IrisResourceLoader(prefix, cacheSize);
	handlebars=new Handlebars(loader)
		.with(templateCache)
		.registerHelper(EnumHelper.NAME, EnumHelper.INSTANCE)
		.registerHelper(IfEqualHelper.NAME, IfEqualHelper.INSTANCE)
		.registerHelpers(HandlebarsHelpersSource.class)
		.registerHelpers(StringHelpers.class)
		.registerHelper(PluralizeHelper.NAME, PluralizeHelper.INSTANCE);
}
 

public String compileTemplate(TemplatingExecutor executor,
                              Map<String, Object> bundle, String templateFile) throws IOException {
    TemplateLoader loader = new AbstractTemplateLoader() {
        @Override
        public TemplateSource sourceAt(String location) {
            return findTemplate(executor, location);
        }
    };

    Context context = Context
            .newBuilder(bundle)
            .resolver(
                    MapValueResolver.INSTANCE,
                    JavaBeanValueResolver.INSTANCE,
                    FieldValueResolver.INSTANCE)
            .build();

    Handlebars handlebars = new Handlebars(loader);
    handlebars.registerHelperMissing((obj, options) -> {
        LOGGER.warn(String.format(Locale.ROOT, "Unregistered helper name '%s', processing template:\n%s", options.helperName, options.fn.text()));
        return "";
    });
    handlebars.registerHelper("json", Jackson2Helper.INSTANCE);
    StringHelpers.register(handlebars);
    handlebars.registerHelpers(ConditionalHelpers.class);
    handlebars.registerHelpers(org.openapitools.codegen.templating.handlebars.StringHelpers.class);
    Template tmpl = handlebars.compile(templateFile);
    return tmpl.apply(context);
}
 

/**
 * Constructs a handlebars template engine
 *
 * @param resourceRoot the resource root
 */
public HandlebarsTemplateEngine(String resourceRoot) {
    TemplateLoader templateLoader = new ClassPathTemplateLoader();
    templateLoader.setPrefix(resourceRoot);
    templateLoader.setSuffix(null);

    handlebars = new Handlebars(templateLoader);

    // Set Guava cache.
    Cache<TemplateSource, Template> cache = CacheBuilder.newBuilder().expireAfterWrite(10, TimeUnit.MINUTES)
            .maximumSize(1000).build();

    handlebars = handlebars.with(new GuavaTemplateCache(cache));
}
 

protected static TemplateLoader initializeTemplateLoader(final Configuration loaderConfig) {
    final String type = loaderConfig.getString(TYPE_ATTR);
    final String path = loaderConfig.getString(PATH_ATTR);
    switch (type) {
        case CLASSPATH_TYPE:
            return new ClassPathTemplateLoader(path);
        case FILE_TYPE:
            return new FileTemplateLoader(path);
        default:
            throw new SunriseConfigurationException("Could not initialize Handlebars due to unrecognized template loader \"" + type + "\"", CONFIG_TEMPLATE_LOADERS);
    }
}
 

@Test
public void whenClasspathTemplateLoaderIsGiven_ThenSearchesClasspathWithPrefixSuffix() throws IOException {
    TemplateLoader loader = new ClassPathTemplateLoader("/handlebars", ".html");
    Handlebars handlebars = new Handlebars(loader);
    Template template = handlebars.compile("greeting");
    Person person = getPerson("Baeldung");

    String templateString = template.apply(person);

    assertThat(templateString).isEqualTo("Hi Baeldung!");
}
 

@Test
public void whenMultipleLoadersAreGiven_ThenSearchesSequentially() throws IOException {
    TemplateLoader firstLoader = new ClassPathTemplateLoader("/handlebars", ".html");
    TemplateLoader secondLoader = new ClassPathTemplateLoader("/templates", ".html");
    Handlebars handlebars = new Handlebars().with(firstLoader, secondLoader);
    Template template = handlebars.compile("greeting");
    Person person = getPerson("Baeldung");

    String templateString = template.apply(person);

    assertThat(templateString).isEqualTo("Hi Baeldung!");
}
 

public Builder withResourceLoaders() {
    log.debug("using resource loaders");
    loaders.add(new ClassPathTemplateLoader());
    loaders.add(new ClassPathTemplateLoader(TemplateLoader.DEFAULT_PREFIX, ".sql"));
    return this;
}
 

public Templating build() {
    handlebars.with(loaders.toArray(new TemplateLoader[0]));
    return new Templating(handlebars);
}
 

public Builder withResourceLoaders() {
    log.debug("using resource loaders");
    loaders.add(new ClassPathTemplateLoader());
    loaders.add(new ClassPathTemplateLoader(TemplateLoader.DEFAULT_PREFIX, ".sql"));
    return this;
}
 

public Templating build() {
    handlebars.with(loaders.toArray(new TemplateLoader[0]));
    return new Templating(handlebars);
}
 

public Handlebars create(final Configuration configuration) {
    final List<TemplateLoader> templateLoaders = initializeTemplateLoaders(configuration, CONFIG_TEMPLATE_LOADERS);
    return create(templateLoaders, i18NResolver, i18nIdentifierFactory);
}
 

protected static List<TemplateLoader> initializeTemplateLoaders(final Configuration configuration, final String configKey) {
    return configuration.getConfigList(configKey, emptyList())
            .stream()
            .map(HandlebarsFactory::initializeTemplateLoader)
            .collect(toList());
}
 

private static TemplateEngine handlebarsTemplateEngine() {
    final TestableI18nResolver i18nResolver = new TestableI18nResolver(emptyMap());
    final List<TemplateLoader> templateLoaders = singletonList(new ClassPathTemplateLoader("/templates/cmsHelper"));
    final Handlebars handlebars = HandlebarsFactory.create(templateLoaders, i18nResolver, new I18nIdentifierFactory());
    return HandlebarsTemplateEngine.of(handlebars, new HandlebarsContextFactory(new PlayJavaFormResolver(msg -> msg)));
}