Package elki.database

Class DatabaseUtil

java.lang.Object

elki.database.DatabaseUtil

public final class DatabaseUtil
extends java.lang.Object

Class with Database-related utility functions such as centroid computation, covariances etc.

Since:

0.2

Author:

Erich Schubert

Constructor Summary

Constructors

Modifier	Constructor	Description
private	DatabaseUtil()	Fake constructor: Do not instantiate!

Method Summary

Modifier and Type	Method	Description
static java.util.SortedSet<ClassLabel>	getClassLabels(Database database)	Retrieves all class labels within the database.
static java.util.SortedSet<ClassLabel>	getClassLabels(Relation<? extends ClassLabel> database)	Retrieves all class labels within the database.
static ArrayModifiableDBIDs	getObjectsByLabelMatch(Database database, java.util.regex.Pattern name_pattern)	Find object by matching their labels.
static Relation<java.lang.String>	guessLabelRepresentation(Database database)	Guess a potentially label-like representation, preferring class labels.
static Relation<java.lang.String>	guessObjectLabelRepresentation(Database database)	Guess a potentially object label-like representation.

Methods inherited from class java.lang.Object

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

Constructor Detail

DatabaseUtil

private DatabaseUtil()

Fake constructor: Do not instantiate!

Method Detail

guessLabelRepresentation

public static Relation<java.lang.String> guessLabelRepresentation(Database database)

Guess a potentially label-like representation, preferring class labels.

Parameters:

database -

Returns:

string representation

guessObjectLabelRepresentation

public static Relation<java.lang.String> guessObjectLabelRepresentation(Database database)

Guess a potentially object label-like representation.

Parameters:

database -

Returns:

string representation

getClassLabels

public static java.util.SortedSet<ClassLabel> getClassLabels(Relation<? extends ClassLabel> database)

Retrieves all class labels within the database.

Parameters:

database - the database to be scanned for class labels

Returns:

a set comprising all class labels that are currently set in the database

getClassLabels

public static java.util.SortedSet<ClassLabel> getClassLabels(Database database)

Retrieves all class labels within the database.

Parameters:

database - the database to be scanned for class labels

Returns:

a set comprising all class labels that are currently set in the database

getObjectsByLabelMatch

public static ArrayModifiableDBIDs getObjectsByLabelMatch(Database database,
                                                          java.util.regex.Pattern name_pattern)

Find object by matching their labels.

Parameters:

database - Database to search in

name_pattern - Name to match against class or object label

Returns:

found cluster or it throws an exception.