Java Glossary : Essence

Java definitions: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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Essence: A design pattern to help avoid kitchen sink constructors with large numbers of parameters.
You have a separate class (the essence) which has a no-argument constructor and can be initialised incrementally, with setXXX methods, and then when you're done you can make your product object in one step; you can piggyback validity checks on the final creation step. This avoids the problem of having invalid half-initialised objects floating about. The objects don't "graduate" and go out into the world until they have passed the final exam, and been transformed from students into "graduates". Half-baked students can't accidentally be treated as graduates.
design patterns

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