Is it possible to invoke custom function (say static method) from JTwig template?
For instance, in Thymeleaf framework I can call any static method via full name of its class. So I'm looking for something similar for JTwig.
This is not well documented, but here a snippet in pure Java:
final SimpleJtwigFunction myFunction = new SimpleJtwigFunction() {
@Override
public String name() {
return "get_type";
}
@Override
public Object execute(FunctionRequest functionRequest) {
return "toto";
}
};
final EnvironmentConfiguration configuration = EnvironmentConfigurationBuilder
.configuration()
.functions()
.add(myFunction)
.and()
.build();
final JtwigTemplate template = JtwigTemplate.classpathTemplate("hive_create_table.sql.twig", configuration);
And template:
CREATE EXTERNAL TABLE sample2(
{% for field in fields%}{% if field.name != "serialVersionUID" %}
`{{ field.name }}`:{{ field.type | get_type | upper }},{% endif %}{% endfor %}
)
I've found the following solution:
1) create own function via extending org.jtwig.functions.SimpleJtwigFunction
2) register it in extended org.jtwig.environment.EnvironmentConfiguration
3) construct custom bean for the extended configuration and pass it into the JtwigViewResolver
:
<bean id="jtwigDec" class="...ExtendedEnvironmentConfiguration"/>
<bean id="jtwigRenderer" class="org.jtwig.web.servlet.JtwigRenderer">
<constructor-arg ref="jtwigDec"/>
</bean>
<bean class="org.jtwig.spring.JtwigViewResolver">
...
<property name="renderer" ref="jtwigRenderer"/>
</bean>
i had a few problems to understand the first answer so i changed it a little...
final SimpleJtwigFunction myFunction = new SimpleJtwigFunction() {
@Override
public String name() {
return "translate";
}
@Override
public Object execute(FunctionRequest request) {
String value1 = "a Problem";
if (request.getNumberOfArguments() == 1) {
if (request.get(0) instanceof String) {
value1 = request.getEnvironment().getValueEnvironment().getStringConverter().convert(request.get(0));
}
}
return ("This is: "+value1);
}
};
final EnvironmentConfiguration configuration = EnvironmentConfigurationBuilder
.configuration()
.functions()
.add(myFunction)
.and()
.build();
String templatenamex = defaultpath + templatename;
JtwigTemplate template = JtwigTemplate.classpathTemplate(templatename,configuration);
JtwigModel model = JtwigModel.newModel();
for (String key : map.keySet()) {
model.with(key, map.get(key));// .replace("\"", "\\\""));
}
String resultx = template.render(model);
and in template
{{ translate("go") }}
creates:
this is: go
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