Java Generic Csv String to Enum List

Question

I would like to genericly convert String in csv form to List of enum. However java won't recognise the generic enum type.

I'm using Guava and can't use Java 8.

Any idea ?

public static <E extends Enum<E>> List<E> getEnumList(String csvLine) {
    List<String> csvList = Arrays.asList(csvLine.split(","));

    Function<String, E> enumList = new Function<String, E>() {
       @Override
       public E apply(String csvStr) {
          return Enum.valueOf(E.class, csvStr);
       }
    };

    return Lists.transform(csvList, enumList);
}

Konstantin Yovkov · Accepted Answer · 2015-04-11 17:07:24Z

3

You have to pass the Class<E>, because E will be erased (and replaced with something specific at Runtime).

Something like:

public static <E extends Enum<E>> List<E> getEnumList(String csvLine, Class<E> clazz) {
    List<String> csvList = Arrays.asList(csvLine.split(","));

    Function<String, E> enumList = new Function<String, E>() {
       @Override
       public E apply(String csvStr) {
          return Enum.valueOf(clazz, "");
       }
    };

    return Lists.transform(csvList, enumList);
}

As a side note, I guess you have to replace the empty string "" with csvStr, otherwise the csvStr parameter doesn't make any sense.

answered Apr 11, 2015 at 17:07

Konstantin Yovkov

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1 Comment

Clément Crepy Over a year ago

Indeed, i forgot to change "" to strCsv.

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