org.basex.index

Class Stats

java.lang.Object

org.basex.index.Stats

public final class Stats
extends java.lang.Object

This class provides statistical data for an indexed node.

Author:

BaseX Team 2005-12, BSD License, Christian Gruen

Field Summary

Fields

Modifier and Type	Field and Description
TokenIntMap	cats Categories.
int	count Number of occurrences.
double	max Maximum value.
double	min Minimum value.
StatsType	type Data type.

Constructor Summary

Constructors

Constructor and Description
Stats() Default constructor.
Stats(DataInput in) Constructor, specifying an input stream.

Method Summary

Methods

Modifier and Type	Method and Description
void	add(byte[] val, MetaData meta) Adds a value.
boolean	isLeaf() Getter for leaf.
void	setLeaf(boolean l) Setter for leaf.
java.lang.String	toString()
void	write(DataOutput out) Writes the key statistics to the specified output stream.

Methods inherited from class java.lang.Object

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

Field Detail

cats

public TokenIntMap cats

Categories.

type

public StatsType type

Data type.

min

public double min

Minimum value.

max

public double max

Maximum value.

count

public int count

Number of occurrences.

Constructor Detail

Stats

public Stats()

Default constructor.

Stats

public Stats(DataInput in)
      throws java.io.IOException

Constructor, specifying an input stream.

Parameters:

in - input stream

Throws:

java.io.IOException - I/O exception

Method Detail

isLeaf

public boolean isLeaf()

Getter for leaf.

Returns:

leaf

setLeaf

public void setLeaf(boolean l)

Setter for leaf.

Parameters:

l - leaf or not

write

public void write(DataOutput out)
           throws java.io.IOException

Writes the key statistics to the specified output stream.

Parameters:

out - output stream

Throws:

java.io.IOException - I/O exception

add

public void add(byte[] val,
       MetaData meta)

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 a maximum, the cached values are skipped, and contents are treated as arbitrary strings.

Parameters:

val - value to be added

meta - meta data

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object