Guice: Injecting parameterized constructor

Question

I am new to Guice and searched on google for this problem but couldn't find satisfactory answer.

public class X {
    private Y y;

    public X() {
        y = new Y("abc", "xyz");
    }
}

public class Y {
    private String str1;
    private String str2;

    public Y(String str1, String str2) {
        this.str1 = str1;
        this.str2 = str2;
    }
}

Now, I want to inject Y into constructor of class X.

I did find AssistedInject but isn't it for constructor which has parameters some of which are provided by Guice and some of them are provided by caller.

Here, in this case, all the parameters to the constructor are provided by caller only.

How can I do that?

Matt · Accepted Answer · 2011-10-19 09:22:32Z

3

You can use a binding annotation (or the builtin @Named) for this, see the 1st Q in the Guice FAQ

This gives you a way to disambiguate 2 identical types. For example

// in the module
bind(String.class).annotatedWith(Names.named("logical.env.id")).toInstance(System.getProperty("logical.env.id", "UK"));

// in the class
@Inject
public Foo(Bar barInstance, @Named("logical.env.id") String logicalEnvId) {
}

answered Oct 19, 2011 at 9:22

Matt

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Comments

jfpoilpret · Accepted Answer · 2011-10-19 06:49:02Z

1

I did find AssistedInject but isn't it for constructor which has parameters some of which are provided by Guice and some of them are provided by caller.

Correct.

Here, in this case, all the parameters to the constructor are provided by caller only.

How can I do that?

Just do it the way you did: with new Y(...) in X constructor.

Why do you want to use Guice in this situation?

answered Oct 19, 2011 at 6:49

jfpoilpret

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