Consumer Pattern

'Consumer Pattern' - work in progress

Description

You have a group of objects that you would like to use in a certain way depending on what the object actually is.

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Example

 public interface Product {
 }

 public class GoodProduct implements Product {...}

 public class HazardousProduct implements Product {...}

 public class RecalledProduct implements Product {...}

...

 public class ConsumeProduct {
   private final ConsumeProduct CONSUMER = new 
            ConsumeProduct();

   private ConsumeProduct() {}
   public getInstance() {
      return CONSUMER;
   }

   public boolean test(Product p) {}

Uh, the above definition is an error in Java; if a function is declared to return a boolean, it should either be abstract or in fact return a boolean. I assume you meant something else, delete when fixed.

   public void use(Product p) {}
   public void tag(Product p, Tag t) {}
   ...
 }

 public class Application {
   RecalledProduct rp;

   rp = new RecalledProduct();

   if (ConsumeProduct.test(rp)) {
      ConsumeProduct.use(rp);
   }
   else {
      ConsumeProduct.tag(rp, Tag.BAD);
   }
   ...
 }

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Note

Not sure if this Pattern is already defined. It is similar to VisitorPattern but not really sure... comments are welcome.

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Comments

I know that this page is a work in progress, but what is this pattern used for? Much of the Java code looks suspicious, and it appears that instantiating a ConsumeProduct? retroactively instantiates another ConsumeProduct?, and so on...a recursive class definition that never terminates is not a good thing. Perhaps you left out a "static" declaration; it almost appears you are trying for SingletonPattern, given that you have a method named getIntance()???

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