Package org.terrier.matching.matchops

Class FuzzyTermOp

java.lang.Object

org.terrier.matching.matchops.Operator

org.terrier.matching.matchops.MultiTermOp

org.terrier.matching.matchops.SynonymOp

org.terrier.matching.matchops.PrefixTermOp

org.terrier.matching.matchops.FuzzyTermOp

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class FuzzyTermOp
extends PrefixTermOp

A synonym class that uses leveinsten distance to match terms. Has a number of configuration options from the MatchOpQL parser:

• fuzziness - The maximum Levenshtein Edit Distance threshold (integer), or AUTO, or AUTO.lowT.highT. Default is AUTO.3.6. See Elastic option reference.
• prefix_length - The number of initial characters which must match to accept a term - See Elastic's fuzzy documentation
• max_expansions - The maximum number of terms to accept into the synonym group - See Elastic's fuzzy documentation

Since:

5.0

Author:

Craig Macdonald

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	STRING_PREFIX

Fields inherited from class org.terrier.matching.matchops.PrefixTermOp

logger

Fields inherited from class org.terrier.matching.matchops.Operator

IGNORE_LOW_IDF_TERMS

Constructor Summary

Constructors

Constructor	Description
FuzzyTermOp(java.lang.String searchString)
FuzzyTermOp(java.lang.String searchString, java.lang.Integer _prefix_length, java.lang.Integer maxExpansions, java.lang.Integer maxDist, java.lang.Integer _lowT, java.lang.Integer _highT)

Method Summary

Modifier and Type	Method	Description
protected java.lang.String	getEndString(java.lang.String termLo)
protected java.lang.String	getStartString(java.lang.String search)
java.lang.String	toString()

Methods inherited from class org.terrier.matching.matchops.PrefixTermOp

getPostingIterator

Methods inherited from class org.terrier.matching.matchops.SynonymOp

createFinalPostingIterator, mergeStatistics

Methods inherited from class org.terrier.matching.matchops.MultiTermOp

addStatistics, clone, getConstituents, getMatcher

Methods inherited from class org.terrier.matching.matchops.Operator

equals, hashCode, parse

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

STRING_PREFIX

public static final java.lang.String STRING_PREFIX

See Also:

Constant Field Values

Constructor Detail

FuzzyTermOp

public FuzzyTermOp(java.lang.String searchString)

FuzzyTermOp

public FuzzyTermOp(java.lang.String searchString,
                   java.lang.Integer _prefix_length,
                   java.lang.Integer maxExpansions,
                   java.lang.Integer maxDist,
                   java.lang.Integer _lowT,
                   java.lang.Integer _highT)

Method Detail

getStartString

protected java.lang.String getStartString(java.lang.String search)

Overrides:

getStartString in class PrefixTermOp

getEndString

protected java.lang.String getEndString(java.lang.String termLo)

Overrides:

getEndString in class PrefixTermOp

toString

public java.lang.String toString()

Overrides:

toString in class PrefixTermOp