dragon.ir.query

Interface IRQuery

All Known Subinterfaces:

Predicate

All Known Implementing Classes:

AbstractIRQuery, AbstractPredicate, BoolQualifierPredicate, BoolRelationPredicate, BoolTermPredicate, RelBoolQuery, RelSimpleQuery, SimpleRelationPredicate, SimpleTermPredicate

public interface IRQuery

Interface of IR Query

Copyright: Copyright (c) 2005

Company: IST, Drexel University

Version:

1.0

Author:

Davis Zhou

Method Summary

Modifier and Type	Method and Description
IRQuery	getChild(int index)
int	getChildNum()
Operator	getOperator()
int	getQueryKey()
double	getSelectivity()
boolean	isCompoundQuery() If the current query denotes a simple predicate, this method returns false, otherwise true.
boolean	isPredicate() A predicate always begins with a ltter T (term predicate), R(relation predicate), or M(modifier predicate)
boolean	isRelBoolQuery()
boolean	isRelSimpleQuery()
boolean	parse(String query)
void	setQueryKey(int key)
String	toString()

Method Detail

getQueryKey

int getQueryKey()

Returns:

the unique id of the query

setQueryKey

void setQueryKey(int key)

isPredicate

boolean isPredicate()

A predicate always begins with a ltter T (term predicate), R(relation predicate), or M(modifier predicate)

Returns:

true if the the current query denotes a simple predicate, otherwise false.

isCompoundQuery

boolean isCompoundQuery()

If the current query denotes a simple predicate, this method returns false, otherwise true.

Returns:

false if the the current query denotes a simple predicate, otherwise true.

isRelSimpleQuery

boolean isRelSimpleQuery()

isRelBoolQuery

boolean isRelBoolQuery()

getChild

IRQuery getChild(int index)

getChildNum

int getChildNum()

getSelectivity

double getSelectivity()

getOperator

Operator getOperator()

toString

String toString()

Overrides:

toString in class Object

parse

boolean parse(String query)

Parameters:

query - the query string

Returns:

a structured query