de.unidu.is.retrieval.pire.dt
Class YearDT

java.lang.Object
  de.unidu.is.retrieval.pire.dt.AbstractDT
      de.unidu.is.retrieval.pire.dt.NumberDT
          de.unidu.is.retrieval.pire.dt.YearDT

All Implemented Interfaces:

DT

public class YearDT

extends NumberDT

A class for the IR datatype "year", containing the deterministic operators "<", "<=", ">", ">=" and the vague operators "~<", "~>" and "~=". The identity mapping function is used for the deterministic operators, a logistic function for the vague ones.

Since:

2003-09-23

Version:

$Revision: 1.7 $, $Date: 2005/02/21 17:29:26 $

Author:

Henrik Nottelmann

Field Summary

static java.lang.String	EQ Operator name "=".
static java.lang.String	EQUALS Operator name "=".
static java.lang.String	GE operator name ">=".
static java.lang.String	GT Operator name ">".
static java.lang.String	LE Operator name "<=".
static java.lang.String	LT Operator name "<".
static java.lang.String	NAME The name of this datatype.
static java.lang.String	VEQ Operator name "~=".
static java.lang.String	VGT Operator name "~>".
static java.lang.String	VLT Operator name "~<".

Constructor Summary

YearDT()

Method Summary

java.util.Iterator

getIndexTokens(Index index, java.lang.String operator) Returns an iterator over all tokens for whom the indexing weight moments have to be computed.

Methods inherited from class de.unidu.is.retrieval.pire.dt.NumberDT

addRSVRules, convertOperator, getFilter, getProbsTemplate, getQueryFilter, includesEqual, includesGreater, includesLess, isVague, storedRSVs

Methods inherited from class de.unidu.is.retrieval.pire.dt.AbstractDT

addProbRules, addToIndex, computeIndex, removeIndex

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final java.lang.String NAME

The name of this datatype.

See Also:

Constant Field Values

EQUALS

public static final java.lang.String EQUALS

Operator name "=".

See Also:

Constant Field Values

EQ

public static final java.lang.String EQ

Operator name "=".

See Also:

Constant Field Values

LT

public static final java.lang.String LT

Operator name "<".

See Also:

Constant Field Values

LE

public static final java.lang.String LE

Operator name "<=".

See Also:

Constant Field Values

GT

public static final java.lang.String GT

Operator name ">".

See Also:

Constant Field Values

GE

public static final java.lang.String GE

operator name ">=".

See Also:

Constant Field Values

VEQ

public static final java.lang.String VEQ

Operator name "~=".

See Also:

Constant Field Values

VLT

public static final java.lang.String VLT

Operator name "~<".

See Also:

Constant Field Values

VGT

public static final java.lang.String VGT

Operator name "~>".

See Also:

Constant Field Values

Constructor Detail

YearDT

public YearDT()

Method Detail

getIndexTokens

public java.util.Iterator getIndexTokens(Index index,
                                         java.lang.String operator)

Description copied from class: AbstractDT

Returns an iterator over all tokens for whom the indexing weight moments have to be computed.

The default implementation returns null, specifying that all tokens which stored in the index should be used. Other implementations can override this behaviour. TODO: really useful?

Specified by:

getIndexTokens in interface DT

Overrides:

getIndexTokens in class NumberDT