# Package org.apache.poi.openxml4j.util

- Interface Summary
  Interface | Description
  --- | ---
  ZipEntrySource | An Interface to make getting the different bits of a Zip File easy.

- Class Summary
  Class | Description
  --- | ---
  Nullable<E> | Deprecated No longer used in POI code base, use `Optional` instead
  ZipArchiveThresholdInputStream |
  ZipFileZipEntrySource | A ZipEntrySource wrapper around a ZipFile.
  ZipInputStreamZipEntrySource | Provides a way to get at all the ZipEntries from a ZipInputStream, as many times as required.
  ZipSecureFile | This class wraps a `ZipFile` in order to check the entries for zip bombs while reading the archive.

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