support instant type format

[agongi]

as reference mentioned, java instant type can be formatted as following:

https://github.com/lazee/freemarker-java-8#ballot_box_with_check-javatimeinstant

${myinstant.format()}

but It doesnt support format as coded like this:

    @Override
    public TemplateModel getForType(String s) throws TemplateModelException {
        if (METHOD_FORMAT.equals(s)) {
            return new InstantFormatter(getObject());
        }
        throw new TemplateModelException(METHOD_UNKNOWN_MSG + s);
    }


    public class InstantFormatter extends AbstractFormatter<Instant> implements TemplateMethodModelEx {

        public InstantFormatter(Instant obj) {
            super(obj);
        }


        @Override
        public Object exec(List list) throws TemplateModelException {
            return getObject().toString();  // format ignored
        }
    }

generated value is always getObject().toString() so formatting wont work

I've searched other types of type, and find out this:

    public class LocalDateFormatter extends AbstractFormatter<LocalDate> implements TemplateMethodModelEx {

        public LocalDateFormatter(LocalDate obj) {
            super(obj);
        }


        @Override
        public Object exec(List list) throws TemplateModelException {
            return getObject().format(createDateTimeFormatter(list, 0, DateTimeFormatter.ISO_LOCAL_DATE));
        }
    }

in your code-context, instant type also can be formatted.

public class FormattableInstantAdapter extends AbstractAdapter<Instant> implements AdapterTemplateModel,
    TemplateScalarModel, TemplateHashModel {

    public FormattableInstantAdapter(Instant obj, BeansWrapper wrapper) {
        super(obj, wrapper);
    }

    @Override
    public TemplateModel getForType(String s) throws TemplateModelException {
        if (METHOD_FORMAT.equals(s)) {
            return new InstantFormatter(getObject());
        }

        throw new TemplateModelException(METHOD_UNKNOWN_MSG + s);
    }

    public class InstantFormatter extends AbstractFormatter<Instant> implements TemplateMethodModelEx {

        public InstantFormatter(Instant obj) {
            super(obj);
        }

        @Override
        public Object exec(List list) throws TemplateModelException {
            return createDateTimeFormatter(list, 0, DateTimeFormatter.ISO_LOCAL_DATE_TIME)
                .withZone(ZoneId.systemDefault())  // instant use UTC as default
                .format(getObject());
        }
    }
}

[lazee]

Fixed in version 2.1.0 that will be released soon