cz.cuni.mff.ksi.jinfer.basicdtd.utils
Class DomainUtils

java.lang.Object
  cz.cuni.mff.ksi.jinfer.basicdtd.utils.DomainUtils

public final class DomainUtils
extends Object

Utility functions for attribute domain handling. Domain is the range of values an attribute may have. In the context of this class, it is a hash map of (attribute value, number of times it was used).

Field Summary

static String	ATTRIBUTE_CDATA DTD's way of saying the attribute contains character data.
static String	ATTRIBUTE_IMPLIED DTD's way of saying the attribute has an implied value.

Method Summary

static String	getAttributeType(Map<String,Integer> domain, int threshold) For domain D of attribute A returns its description, or the type of A.
static String	getDefault(Map<String,Integer> domain, double ratio) Returns the default value for this domain (that is the value found with probability higher than ratio) or #IMPLIED, if there is no dominant value.
static Map<String,Integer>	getDomain(Attribute attribute) Returns the domain of values of this attribute.

Methods inherited from class java.lang.Object

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

Field Detail

ATTRIBUTE_IMPLIED

public static final String ATTRIBUTE_IMPLIED

DTD's way of saying the attribute has an implied value.

See Also:

Constant Field Values

ATTRIBUTE_CDATA

public static final String ATTRIBUTE_CDATA

DTD's way of saying the attribute contains character data.

See Also:

Constant Field Values

Method Detail

getDomain

public static Map<String,Integer> getDomain(Attribute attribute)

Returns the domain of values of this attribute.

getDefault

public static String getDefault(Map<String,Integer> domain,
                                double ratio)

Returns the default value for this domain (that is the value found with probability higher than ratio) or #IMPLIED, if there is no dominant value.

Parameters:

ratio - Minimal ratio of a single value occurence, above which it is declared dominant and therefore default.

Returns:

Default value in double quotes or the keyword #IMPLIED.

getAttributeType

public static String getAttributeType(Map<String,Integer> domain,
                                      int threshold)

For domain D of attribute A returns its description, or the type of A. Decides whether this domain is small enough to be enumerated in the attribute definition, or whether it should be an ambiguous CDATA.

Parameters:

threshold - Domains smaller or equal to this will be returned as an enum, larger as CDATA.

Returns:

String defining (describing) this domain.