org.basex.data
Class StatsKey

java.lang.Object
  org.basex.data.StatsKey

public final class StatsKey
extends Object

This class provides statistics for a tag or attribute name and its contents.

Author:

Workgroup DBIS, University of Konstanz 2005-10, ISC License, Christian Gruen

Nested Class Summary

static class

StatsKey.Kind Kind of Contents.

Field Summary

TokenSet	cats Categories.
int	counter Number of occurrences.
StatsKey.Kind	kind Node kind.
boolean	leaf Leaf node flag.
double	len Average text-length.
double	max Maximum value.
double	min Minimum value.

Constructor Summary

StatsKey()
Default constructor.

StatsKey(DataInput in)
Constructor, specifying an input stream.

Method Summary

void	add(byte[] val) Adds a value.
void	finish(DataOutput out) Writes the key statistics to the specified output stream.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

kind

public StatsKey.Kind kind

Node kind.

cats

public TokenSet cats

Categories.

min

public double min

Minimum value.

max

public double max

Maximum value.

len

public double len

Average text-length.

counter

public int counter

Number of occurrences.

leaf

public boolean leaf

Leaf node flag.

Constructor Detail

StatsKey

public StatsKey()

Default constructor.

StatsKey

public StatsKey(DataInput in)
         throws IOException

Constructor, specifying an input stream.

Parameters:

in - input stream

Throws:

IOException - I/O exception

Method Detail

finish

public void finish(DataOutput out)
            throws IOException

Writes the key statistics to the specified output stream.

Parameters:

out - output stream

Throws:

IOException - I/O exception

add

public void add(byte[] val)

Adds a value. All values are first treated as integer values. If a value can't be converted to an integer, it is treated as double value. If conversion fails again, it is handled as string category. Next, all values are cached. As soon as their number exceeds #MAXCATS, the cached values are skipped, and contents are treated as arbitrary strings.

Parameters:

val - value to be added

toString

public String toString()

Overrides:

toString in class Object