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.

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).