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POHow to @Inject into existing object hierarchy using Guice?
 

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    <p>I have an existing object hierarchy where some objects have fields that need to be injected. Also there are some other objects that are constructed using <a href="http://code.google.com/p/google-guice/" rel="noreferrer">Google Guice</a> and need to be injected with references to some objects from previously described object hierarchy. How do I do such kind of injection with Guice?</p> <p>The problem is that objects from existing hierarchy were not constructed using Guice, and therefore are not subject to inject process by default. There is, of course <code>injector.injectMembers()</code> method that is able to inject into existing object instance, but it does not work on object hierarchies.</p> <p>For those wondering why I can't build mentioned object hierarchy using Guice. This hierarchy represents GUI objects and is built by a GUI framework (<a href="http://pivot.apache.org/" rel="noreferrer">Apache Pivot</a>) from a declarative GUI description (in fact this process can be described as object deserialization). That way interface construction is rather simple, and I only want to inject certain service references into interface objects and vice versa (for callbacks).</p> <p>Approach I am currently about to take is described below. </p> <p>For injecting into preexisting object hierarchy just let all objects that are interested in injection implement certain interface, like:</p> <pre><code>public interface Injectable { void injectAll(Injector injector); } </code></pre> <p>Those objects would then implement this interface like so:</p> <pre><code>public void injectAll(Injector injector) { injector.injectMembers(this); for (Injectable child : children) child.injectAll(injector); } </code></pre> <p>Then I'd just call <code>mainWindow.injectAll(injector)</code> for root object in hierarchy and all objects of interest are injected.</p> <p>Not very nice solution, but gets the work done on one side. On the other side, I need to inject objects from this hierarchy. I guess it can be done via implementing custom provider for such objects.</p> <p>Is there a better solution to my problem? Maybe there is also something wrong with my approach?</p>
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