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POHow to convert a String to the correct Enum constant (multiple Enums implementing a common interface)?
 

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  1. POHow to convert a String to the correct Enum constant (multiple Enums implementing a common interface)?
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    <p>Suppose I have an interface...</p> <pre><code>public interface Feature { public abstract void doSmth(); } </code></pre> <p>... and multiple enums implementing that interface:</p> <p>// First enum</p> <pre><code>public enum FeatureA implements Feature { A1 { @Override public void doSmth() { System.out.println("A ==== A1"); } }, A2 { @Override public void doSmth() { System.out.println("A ==== A2"); } }; @Override public abstract void doSmth(); } </code></pre> <p>//Second enum</p> <pre><code>public enum FeatureB implements Feature { B1 { @Override public void doSmth() { System.out.println("B ==== B1"); } }, B2 { @Override public void doSmth() { System.out.println("B ==== B2"); } }, B3 { @Override public void doSmth() { System.out.println("B ==== B3"); } }; @Override public abstract void doSmth(); } </code></pre> <p>// and many other enums implementing Feature</p> <p>Now suppose I assemble a set of Strings corresponding to the names of enum constants like this (this is necessary for the third party code)...</p> <pre><code>Set&lt;String&gt; singleEnum = new LinkedHashSet&lt;String&gt;(); singleEnum.add("A2"); singleEnum.add("A1"); </code></pre> <p>... and later I need to convert each String in such a set to the enum constant and then apply the doSmth() method. singleEnum contains names of FeatureA constants only, so I'm able to apply the valueOf(String) method in this case:</p> <pre><code>for (String s : singleEnum) { FeatureA.valueOf(s).doSmth(); } </code></pre> <p>But what if the Strings in the set correspond to varying enum constants? E.g.:</p> <pre><code>Set&lt;String&gt; multipleEnums = new LinkedHashSet&lt;String&gt;(); multipleEnums.add("A1"); multipleEnums.add("B2"); multipleEnums.add("A2"); </code></pre> <p>I would like to do something like this: </p> <pre><code>for (String s : multipleEnums) { Feature./* convert s to the correct enum */.doSmth(); } </code></pre> <p>Is there an easy way to do that? The only method Eclipse allows to apply to Feature is Feature.class, and I don't really know how to proceed from there. I'm dealing with huge datasets, so performance is important.</p> <p>Thank you.</p>
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