Lower case enum resource parameters

[James Harvey]

I think I am going crazy.

I have a PathParam that is an enum, with an uppercase value. I'd like to support the client sending a lower case value, too, eg

public enum Type {
NOW
}

Currently, unless Type is uppercase the client receives a 404.

One solution is to wrap it in an AbstractParam that does a .toLowerCase on the string, but this seems like overkill (although it does work).

I tried using an @JsonCreator on the enum itself, but DW seems to ignore this in the default config. I also started tracing through the innards of the DW Jackson project, and it seems to register a FuzzyEnumModule which should do what we need, but doesn't :)

How have others tackled this problem?

[Dimas Guardado]

Hi James,

Enum Parameter types are not handled by Jackson at all. They are handled natively by Jersey according to the JAX-RS spec. The rules for how types, including enums, can be found here[1] among other places.

A lighter weight way to get case-insensitive handling of enums is to provide a fromString method on the enum that forwards an upperCase string to valueOf.

public enum Type {
    NOW;

    public static Type fromString(String name) {
        return valueOf(name.toUpperCase());
    }
}

Hope that helps,
Dimas

[1] https://jsr311.java.net/nonav/javadoc/javax/ws/rs/PathParam.html

[James Harvey]

Lifesaver, thanks Dimas.

Who knew reading the spec would help! 😳

Sent from my iPhone

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