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POHow to implement and extend Joshua's builder pattern in .net?
 

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  1. POHow to implement and extend Joshua's builder pattern in .net?
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    <ul> <li>How can we implement the Builder pattern of <a href="http://developers.sun.com/learning/javaoneonline/2006/coreplatform/TS-1512.pdf?" rel="noreferrer">Joshua's Effective Java</a> in C#?</li> </ul> <p>Below is the code I have tried, is there a better way to do this?</p> <pre><code> public class NutritionFacts { public static NutritionFacts.Builder Build(string name, int servingSize, int servingsPerContainer) { return new NutritionFacts.Builder(name, servingSize, servingsPerContainer); } public sealed class Builder { public Builder(String name, int servingSize, int servingsPerContainer) { } public Builder totalFat(int val) { } public Builder saturatedFat(int val) { } public Builder transFat(int val) { } public Builder cholesterol(int val) { } //... 15 more setters public NutritionFacts build() { return new NutritionFacts(this); } } private NutritionFacts(Builder builder) { } protected NutritionFacts() { } } </code></pre> <ul> <li><p>How do we extend such a class? Do we need to write separate builder classes for each of the derived classes?</p> <pre><code>public class MoreNutritionFacts : NutritionFacts { public new static MoreNutritionFacts.Builder Build(string name, int servingSize, int servingsPerContainer) { return new MoreNutritionFacts.Builder(name, servingSize, servingsPerContainer); } public new sealed class Builder { public Builder(String name, int servingSize, int servingsPerContainer) {} public Builder totalFat(int val) { } public Builder saturatedFat(int val) { } public Builder transFat(int val) { } public Builder cholesterol(int val) { } //... 15 more setters public Builder newProperty(int val) { } public MoreNutritionFacts build() { return new MoreNutritionFacts(this); } } private MoreNutritionFacts(MoreNutritionFacts.Builder builder) { } } </code></pre></li> </ul>
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