Constructor Detail

• LocalHash

  public LocalHash(byte[] b)

  LocalHash.

• LocalHash

  public LocalHash(Hash h)

  LocalHash.

Method Detail

• cachedXor

  public byte[] cachedXor(Hash key)
                   throws IllegalStateException

  Calculate the xor with the current object and the specified hash, caching values where possible. Currently this keeps up to MAX_CACHED_XOR (1024) entries, and uses an essentially random ejection policy. Later perhaps go for an LRU or FIFO?

  Throws:

  IllegalStateException - if you try to use the cache without first preparing this object's cache via .prepareCache()

• clearXorCache

  public void clearXorCache()

  clearXorCache.

• prepareCache

  public void prepareCache()

  Prepare this hash's cache for xor values - very few hashes will need it, so we don't want to waste the memory, and lazy initialization would incur online overhead to verify the initialization.