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PO"Inject" interface implementions into a class in java
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2012-01-17T11:08:25.767
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I'm wrting something that look like this (of course its a bit more complex than this sample): <pre><code>public class DoOnAll { private List<IActionPerformer> actionPerformers; public DoOnAll(List<IActionPerformer> actionPerformers) { this.actionPerformers = actionPerformers; } public void callFromSomeWhere(String path) { File f = new File(path); List<File> list = Arrays.asList(f.listFiles()); for (File file : list) { for (IActionPerformer action : actionPerformers) { action.perform(file); } } } } </code></pre> <hr> <pre><code>public interface IActionPerformer { public void perform(File file); } </code></pre> <hr> <pre><code>public class SomePerformer implements IActionPerformer { public void perform(File file) { if (getFileType(file) = ".txt") { doSomething } } } </code></pre> I have 2 questions: <ol> <li>Should I move the condition in <code>SomePerformer</code> to another method, <code>boolean accept(File file)</code> for example, and also add this method declartion to the interface? If so, how would I "collect" all the accepted classes in <code>DoOnAll</code>? just go through the <code>actionPerformers</code> list and add all the accepeted to another list and then go through the list of accepted and <code>.perform</code> on them? Or is there another way usually used in the methodology?</li> <li>Which ways are there for injecting the <code>actionPerformrs</code> list into the class? I want to write independent implementations and define in a file, say xml file, which ones to inject into the list.</li> </ol>
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"Inject" interface implementions into a class in java
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