org.egothor.query.runner
Class PhraseRunner

java.lang.Object
  org.egothor.core.query.Runner
      org.egothor.query.runner.PhraseRunner

Direct Known Subclasses:

PhraseRunner

public class PhraseRunner
extends Runner

The PhraseRunner class is used when a user wishes to make a query involving two terms where the 2^nd term must lie within n words of the 1^st . For example, a user might wish to view documents where BASS lies within 2 words of GUITAR. This query would be given in the form:

(BASS 2 GUITAR) (the parentheses are required).

Author:

Leo Galambos

Field Summary

PhraseScan	scanner Description of the Field
TermRunner[]	set Description of the Field

Constructor Summary

PhraseRunner(TermRunner[] a)
Constructor for the PhraseRunner object

Method Summary

int	evaluate(long uid) Return the similarity of this object to the document with the given unique ID.
java.lang.String	invalidReason() Return an explanation as to why this search is invalid.
int	terms() Description of the Method

Methods inherited from class org.egothor.core.query.Runner

run

Methods inherited from class java.lang.Object

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

Field Detail

set

public TermRunner[] set

Description of the Field

scanner

public PhraseScan scanner

Description of the Field

Constructor Detail

PhraseRunner

public PhraseRunner(TermRunner[] a)

Constructor for the PhraseRunner object

Parameters:

a - the Runner array

Method Detail

terms

public int terms()

Description of the Method

Specified by:

terms in class Runner

Returns:

Description of the Return Value

invalidReason

public java.lang.String invalidReason()

Return an explanation as to why this search is invalid.

Specified by:

invalidReason in class Runner

Returns:

a String containing an explanation

evaluate

public int evaluate(long uid)

Return the similarity of this object to the document with the given unique ID. When any of formula variables returns non-positive value, then the evaluation is 0.

Specified by:

evaluate in class Runner

Parameters:

uid - the document in question

Returns:

the similarity