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copied!<p>It's difficult to provide a detailed answer without more information but one approach you could consider is:</p> <ul> <li>Remodel a product using a <code>Product</code> class hierarchy rather than representing each product as a <code>Map</code> of (name, value) pairs. The current Map representation means that many errors are not going to be detected until run-time; better to prefer stronger typing so you can perform more checks at compile-time.</li> <li>Define a template method on the top-level Product class or interface that performs much of the processing currently defined in your 500 line method. For example, you could pass in a visitor to the template method as per the below code extract.</li> </ul> <p><strong>Example</strong></p> <pre><code>/** * Our visitor definition, responsible for processing each product. */ public interface ProductVisitor { void processProductA(ConcreteProductA a); void processProductB(ConcreteProductB b); } /** * Top-level product definition. */ public interface Product { void process(ProductVisitor v); } /** * A conrete product implementation. Makes a callback to the visitor * allowing itself to be processed. */ public class ConcreteProductA implements Product { public void process(ProductVisitor v) { v.processProductA(this); } } /** * As per the previous product implementation but makes a *different* * callback to the visitor. */ public class ConcreteProductB implements Product { public void process(ProductVisitor v) { v.processProductB(this); } } </code></pre> <p>The main advantage with this approach is that you avoid lots of explicit if-then blocks in your code making the design more loosely coupled. The disadvantage is it can make code less readable.</p>

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