How can I use a string as argument for a method that takes an enum?

Question

I have a class TestCase. Inside of this I have the inner class Test. Inside the class enum OwnerType are setters and getters of the enum.

public static final class Test{
    public enum OwnerType {
        User("User"), 
        Role("Role");
    }

    public OwnerType getOwnerType() {
        return m_ownerType;
    }

    public void setOwnerType(OwnerType m_ownerType) {
        this.m_ownerType = m_ownerType;
    }
}

Test is the inner class in my case. I am trying to set the value with JSON key

private Test createTest(JSONObject obj) {
    Test test = new Test();
    test.setOwnerType(JSONUtil.getStringValue(obj, JSON_KEY)); // Gives error
    return test;
}

It gives an error

The method setOwnerType(TestCase.Test.OwnerType) in the type TestCase.Test is not applicable for the arguments (String).

How can I convert the value or set it to the createTest method?

What is the actual value in the JSON? What is the complete, compilable code of the enum? — JB Nizet
– JB Nizet, Commented Mar 7, 2014 at 12:16
The above code doesn't compile, you need to change the enum code to public enum OwnerType { User, Role; } or you need a constructor for OwnerType that takes a String-typed argument. — Erwin Bolwidt
– Erwin Bolwidt, Commented Mar 7, 2014 at 12:22
Yes. The constructor I have like private final String value;private OwnerType(String value) {this.value = value;} — user3177233
– user3177233, Commented Mar 7, 2014 at 12:27
Ok. You can already get the name of the enum using m_ownerType.name() or m_ownerType.toString() (check Javadoc for when to use which) — Erwin Bolwidt
– Erwin Bolwidt, Commented Mar 7, 2014 at 12:30

Konstantin Yovkov · Accepted Answer · 2014-03-07 12:16:57Z

1

You have to use the OwnerType#valueOf(String name) method :

String name = JSONUtil.getStringValue(obj, JSON_KEY);
test.setOwnerType(Test.OwnerType.valueOf(name));

answered Mar 7, 2014 at 12:16

Konstantin Yovkov

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Comments

Jeroen Vannevel · Accepted Answer · 2014-03-07 12:16:56Z

1

You have to parse it into an enum first.

Try this instead:

test.setOwnerType(Test.OwnerType.valueOf(JSONUtil.getStringValue(obj, JSON_KEY)));

Note that you can either do Enum.valueOf(YourEnum.class, stringValue) and YourEnum.valueOf(stringValue).

answered Mar 7, 2014 at 12:16

Jeroen Vannevel

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