Package org.apache.commons.compress.harmony.pack200

Class BandSet.BandData

java.lang.Object
org.apache.commons.compress.harmony.pack200.BandSet.BandData
Enclosing class:
BandSet
public class BandSet.BandData extends Object
BandData represents information about a band, e.g. largest value etc and is used in the heuristics that calculate whether an alternative Codec could make the encoded band smaller.

  • Constructor Summary

    Constructors
    Constructor
    Description
    BandData(int[] band)
    Constructs a new instance of BandData.

  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    anyNegatives()
    Returns true if any band elements are negative.
    boolean
    mainlyPositiveDeltas()
    Returns true if the band deltas are mainly positive (heuristic).
    boolean
    mainlySmallDeltas()
    Returns true if the deltas between adjacent band elements are mainly small (heuristic).
    int
    numDistinctValues()
    Returns the total number of distinct values found in the band.
    boolean
    wellCorrelated()
    Returns true if the band is well correlated (i.e. would be suitable for a delta encoding) (heuristic).

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • BandData

      public BandData(int[] band)
      Constructs a new instance of BandData. The band is then analysed.
      Parameters:
      band - the band of integers

  • Method Details

    • anyNegatives

      public boolean anyNegatives()
      Returns true if any band elements are negative.
      Returns:
      true if any band elements are negative.

    • mainlyPositiveDeltas

      public boolean mainlyPositiveDeltas()
      Returns true if the band deltas are mainly positive (heuristic).
      Returns:
      true if the band deltas are mainly positive (heuristic).

    • mainlySmallDeltas

      public boolean mainlySmallDeltas()
      Returns true if the deltas between adjacent band elements are mainly small (heuristic).
      Returns:
      true if the deltas between adjacent band elements are mainly small (heuristic).

    • numDistinctValues

      public int numDistinctValues()
      Returns the total number of distinct values found in the band.
      Returns:
      the total number of distinct values found in the band.

    • wellCorrelated

      public boolean wellCorrelated()
      Returns true if the band is well correlated (i.e. would be suitable for a delta encoding) (heuristic).
      Returns:
      true if the band is well correlated (i.e. would be suitable for a delta encoding) (heuristic).