org.terrier.querying.parser

Class RequirementQuery

java.lang.Object

org.terrier.querying.parser.Query

org.terrier.querying.parser.RequirementQuery

All Implemented Interfaces:

Serializable, Cloneable

public class RequirementQuery
extends Query

Models a query where the query terms have been qualified with a requirement operator, either plus, or minus.

Author:

Vassilis Plachouras & Craig Macdonald

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.terrier.querying.parser.Query

Query.ForEachQueryNode

Field Summary

Fields inherited from class org.terrier.querying.parser.Query

child, tmpSTQ

Constructor Summary

Constructors

Constructor and Description
RequirementQuery() An empty default constructor.

Method Summary

Methods

Modifier and Type	Method and Description
Object	clone() Deep copy this Query object
boolean	getRequired() Returns True if the subquery is REQUIRED to exist, or false if it REQUIRED to NOT exit.
void	getTermsOf(Class<? extends Query> c, List<Query> alist, boolean req) Returns all the query terms, in subqueries that are instances of a given class.
boolean	obtainControls(Set<String> allowed, Map<String,String> controls) This object cannot contain any controls, so this method will always return false.
void	obtainQueryTerms(MatchingQueryTerms terms) Stores the terms of the query in the given structure, which is used for matching documents to the query.
String	parseTree() Returns the parse tree for the query as a string
void	setRequired(boolean needed) Sets whether the query is required or not.
String	toString() Returns a string representation of the query.

Methods inherited from class org.terrier.querying.parser.Query

apply, applyTermPipeline, getTerms, obtainAllOf, obtainQueryTerms, setChild

Methods inherited from class java.lang.Object

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

Constructor Detail

RequirementQuery

public RequirementQuery()

An empty default constructor.

Method Detail

clone

public Object clone()

Deep copy this Query object

Overrides:

clone in class Query

setRequired

public void setRequired(boolean needed)

Sets whether the query is required or not.

Parameters:

needed - boolean indicates whether the query is required or not.

getRequired

public boolean getRequired()

Returns True if the subquery is REQUIRED to exist, or false if it REQUIRED to NOT exit.

Returns:

See above.

toString

public String toString()

Returns a string representation of the query.

Specified by:

toString in class Query

Returns:

String a string representation of the query.

obtainQueryTerms

public void obtainQueryTerms(MatchingQueryTerms terms)

Stores the terms of the query in the given structure, which is used for matching documents to the query.

Overrides:

obtainQueryTerms in class Query

Parameters:

terms - MatchingQueryTerms the structure that holds the query terms for matching to documents.

obtainControls

public boolean obtainControls(Set<String> allowed,
                     Map<String,String> controls)

This object cannot contain any controls, so this method will always return false.

Overrides:

obtainControls in class Query

Returns:

false

getTermsOf

public void getTermsOf(Class<? extends Query> c,
              List<Query> alist,
              boolean req)

Returns all the query terms, in subqueries that are instances of a given class.

Specified by:

getTermsOf in class Query

Parameters:

c - Class a class of queries.

alist - ArrayList the list of query terms.

req - boolean indicates whether the subqueries are required or not.

parseTree

public String parseTree()

Description copied from class: Query

Returns the parse tree for the query as a string

Specified by:

parseTree in class Query