# Package org.apache.poi.ss.formula.udf

- Interface Summary
  Interface | Description
  --- | ---
  UDFFinder | Common interface for "Add-in" libraries and user defined function libraries.

- Class Summary
  Class | Description
  --- | ---
  AggregatingUDFFinder | Collects add-in libraries and VB macro functions together into one UDF finder
  DefaultUDFFinder | Default UDF finder - for adding your own user defined functions.
  IndexedUDFFinder | A UDFFinder that can retrieve functions both by name and by fake index.

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