ParamConverterProvider implementations for Date/Time classes

[cowwoc]

(Copied from FasterXML/jackson-modules-java8#7)

Please provide ParamConverterProvider implementations for all date/time types that make sense to use as query parameters. For example, here is an implementation I used to pass LocalDateTime as a query parameter (feel free to use it):

/**
 * Enables LocalDateTime to be used as a QueryParam.
 *
 * @author Gili Tzabari
 */
@Provider
@Singleton
public class LocalDateTimeConverter implements ParamConverterProvider {
    @Override public <T> ParamConverter<T> getConverter(Class<T> rawType, Type genericType, Annotation[] annotations) {

        if (!rawType.isAssignableFrom(LocalDateTime.class)) {
            return null;
        }
        return new ParamConverter<T>() {
            @Override
            @SuppressWarnings("unchecked")
            public T fromString(final String value) {
                if (value == null) {
                    throw new IllegalArgumentException("value may not be null");
                }
                return (T) LocalDateTime.parse(value);
            }

            @Override
            public String toString(final T value) {
                return ((LocalDateTime) value).format(DateTimeFormatter.ISO_LOCAL_DATE_TIME);
            }
        };
    }
}

[cowtowncoder]

Also just realized that there are some subtleties wrt where to locate this (project-wise), due to dependency to Java 8.

But one thing I am wondering is this: since nothing in above relies on Jackson, does this even make sense here? Ideally various configuration settings would be used, but unless there is some way to access ObjectMapper or ObjectReader, that can't be done. So in a way maybe this would belong more to DropWizard project?

[cowwoc]

Good point, and in retrospect it seems that I caught this in the past but forgot about it :) dropwizard/dropwizard-java8#26

Closing this issue.

[cowtowncoder]

@cowwoc ok no problem. Took a while for me to figure it out too.