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home > news > java technology > another example of as(...) used for easily extensible apis

Another example of as(...) used for easily extensible APIs

Here's another simple example of how the as(...) idiom can be used for create an API which is stable, elegant, but extensible (this time unrelated to any semantic stuff). Up to a few days ago, I had the following interface in the GeoCoding API of forceTen: public interface GeoCoderEntity extends Comparable, Serializable, As, Lookup.Provider   {     public enum Type       {          ...       };     @Nonnull     public String getId();         @Nonnull     public Coordinate getCoordinate();         @Nonnull     public String getCode();         @Nonnull     public String getTypeAsString();     @Nonnull     public Type getType();     @Nonnull     public Collection findAllChildren();         @Nonnull     public GeoCoderEntity getParent()       throws NotFoundException;         @Override @Nonnull     public T as (@Nonnull Class personalityType);     @Override @Nonnull     public T as (@Nonnull Class personalityType, @Nonnull NotFoundBehaviour notFoundBehaviour); &...


Date: December, 28 2009
Url: http://www.java.net/blog/fabriziogiudici/archive/2009/12/28/another-example-used-easily-extensible-apis


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