Class HashingNameMapper

All Implemented Interfaces:

public class HashingNameMapper extends Object implements NameMapper
Wrapping NameMapper, that wraps another NameMapper and hashes resulting strings. It makes use of fact that (proper) Hash will create unique fixed length string for each different input string (so injection still stands). This mapper produces file system friendly names. Supports different "depths" (0-4 inclusive) where the name will contain 0 to 4 level deep directories.

This mapper is usable in any scenario, but intent was to produce more "compact" name mapper for file locking.

  • Constructor Details

  • Method Details

    • isFileSystemFriendly

      public boolean isFileSystemFriendly()
      Description copied from interface: NameMapper
      Returns true if lock names returned by this lock name mapper are file system friendly, can be used as file names and paths.
      Specified by:
      isFileSystemFriendly in interface NameMapper
    • nameLocks

      public Collection<String> nameLocks(RepositorySystemSession session, Collection<? extends Artifact> artifacts, Collection<? extends Metadata> metadatas)
      Description copied from interface: NameMapper
      Creates (opaque) names for passed in artifacts and metadata. Returned collection has max size of sum of the passed in artifacts and metadata collections, or less. If an empty collection is returned, there will be no locking happening. Never returns null. The resulting collection MUST BE "stable" (always sorted by same criteria) to avoid deadlocks by acquiring locks in same order, essentially disregarding the order of the input collections.

      There is no requirement of any kind of "parity" between input element count (sum of two collections, that is) and output collection size, just the returned upper size limit is defined (sum of the passed in two collections size). If returned collection is empty, no locking will happen, if single element, one lock will be used, if two then two named locks will be used etc.

      Specified by:
      nameLocks in interface NameMapper