CODEWITHSUNDEEP
javadesign-patterns
Sandeep B
Sandeep B

Reputation: 775

Factory pattern with many conditions

Suppose I have 100 types of objects to be created and for that I have exposed a factory to create these objects. For the creation of these objects, I have 100's of if, else if.

In these kind of scenarios where many types of objects are to be created (of course you want to create one object per class), is there a better creational pattern?

Upvotes: 1

Views: 1151

Answers (1)

Eran
Eran

Reputation: 393841

If there's a single criteria by which you choose which class to instantiate, you can create a Map<CriteriaType,Class> which maps a criteria to the class that should be instantiated.

Then, your 100 if else-ifs would be reduced to a single map.get(criteria).newInstace().

If you have multiple criteria, you can try to arrange them in a hierarchy, and then you can have a multi-dimensional map, such as Map<CriteriaType1,Map<CriteriaType2,Class>>. Then you'll have to go down the hierarchy to find the class to be instantiated.

Upvotes: 10

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