Module kala.compress.compressors.pack200
Package kala.compress.harmony.pack200

Class BandSet.BandData

  • Enclosing class:
    BandSet
    public class BandSet.BandData
extends java.lang.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.

    • Field Detail

      • band

        private final int[] band

      • smallest

        private int smallest

      • largest

        private int largest

      • smallestDelta

        private int smallestDelta

      • largestDelta

        private int largestDelta

      • deltaIsAscending

        private int deltaIsAscending

      • smallDeltaCount

        private int smallDeltaCount

      • averageAbsoluteDelta

        private double averageAbsoluteDelta

      • averageAbsoluteValue

        private double averageAbsoluteValue

      • distinctValues

        private java.util.Map<java.lang.Integer,​java.lang.Integer> distinctValues

    • Constructor Detail

      • BandData

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

    • Method Detail

      • 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).