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February 01, 2011

Mark Wielaard: New GPG key. Finally created a new GPG key using gnupg. The old one was a DSA/1024 bits one and 8 years old. The new one is a RSA/2048 bits one. I will use the new one in the future to sign any release tarballs I might create. pub 2048R/57816A6A 2011-01-29 Key f...

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February 01, 2011

Andrew Hughes: [SECURITY] IcedTea6 1.7.8, 1.8.5, 1.9.5 Released!. We are pleased to announce a new set of security releases, IcedTea6 1.7.8, IcedTea6 1.8.5 and IcedTea6 1.9.5. This update contains the following security updates: The IcedTea project provides a harness to build the source code from OpenJDK6 u...

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home > news > java technology > the finder pattern

The Finder Pattern

In many previous code examples in this blog I've used the “Finder pattern”, that I've elected as one of my best practices (it's standard in all my new APIs and will be retrofitted to the old ones). Before moving on with more examples, I think it's high time I shortly introduced it formally. As the name suggests, it helps whenever you need to provide a search of some type. For instance, in the Hierarchy API the interfaces HView and HItem (name shortened from Hierarchical*** in my previous post) implement a Composite pattern, so a HItem has got children: public interface HView   {       @Nonnull     public Finder findChildren();          @Nonnull     public Builder createChild();          @Nonnull     public Builder findOrCreateChild();   } public interface HItem extends HView   {     @Nonnull     public HView getView();     @Nonnull     public HItem getParent()       throws NotFoundException;   } There are many ways to search for children; for instance, you could search for a specific child with an id, or if you recall that any object in the Hierarchical API is logically bound to another object, you could explicitly search for children with a specific ...


Date: January, 15 2010
Url: http://www.java.net/blog/fabriziogiudici/archive/2010/01/15/finder-pattern


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