nl.inl.blacklab.search.lucene.optimize

Class ClauseCombinerNfa

java.lang.Object

nl.inl.blacklab.search.lucene.optimize.ClauseCombiner

nl.inl.blacklab.search.lucene.optimize.ClauseCombinerNfa

public class ClauseCombinerNfa
extends ClauseCombiner

Converts one clause to an NFA and uses the other as the anchor in a FISEQ operation to match using the forward index.

Field Summary

Fields

Modifier and Type	Field and Description
static long	DEFAULT_NFA_THRESHOLD The default value of nfaThreshold.
protected static org.apache.logging.log4j.Logger	logger
static long	MAX_NFA_MATCHING The maximum value of nfaFactor, meaning "make as many NFAs as possible".
static long	NO_NFA_MATCHING The minimum value of nfaFactor, meaning "make no NFAs".

Fields inherited from class nl.inl.blacklab.search.lucene.optimize.ClauseCombiner

CANNOT_COMBINE

Constructor Summary

Constructors

Constructor and Description
ClauseCombinerNfa()

Method Summary

Modifier and Type	Method and Description
BLSpanQuery	combine(BLSpanQuery left, BLSpanQuery right, org.apache.lucene.index.IndexReader reader)
static long	getNfaThreshold()
int	priority(BLSpanQuery left, BLSpanQuery right, org.apache.lucene.index.IndexReader reader)
static void	setNfaMatchingEnabled(boolean doNfaMatching)
static void	setNfaThreshold(long nfaThreshold)
String	toString()

Methods inherited from class nl.inl.blacklab.search.lucene.optimize.ClauseCombiner

all, canCombine

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected static final org.apache.logging.log4j.Logger logger

DEFAULT_NFA_THRESHOLD

public static final long DEFAULT_NFA_THRESHOLD

The default value of nfaThreshold.

See Also:

Constant Field Values

MAX_NFA_MATCHING

public static final long MAX_NFA_MATCHING

The maximum value of nfaFactor, meaning "make as many NFAs as possible".

See Also:

Constant Field Values

NO_NFA_MATCHING

public static final long NO_NFA_MATCHING

The minimum value of nfaFactor, meaning "make no NFAs".

See Also:

Constant Field Values

Constructor Detail

ClauseCombinerNfa

public ClauseCombinerNfa()

Method Detail

setNfaThreshold

public static void setNfaThreshold(long nfaThreshold)

getNfaThreshold

public static long getNfaThreshold()

setNfaMatchingEnabled

public static void setNfaMatchingEnabled(boolean doNfaMatching)

priority

public int priority(BLSpanQuery left,
                    BLSpanQuery right,
                    org.apache.lucene.index.IndexReader reader)

Specified by:

priority in class ClauseCombiner

combine

public BLSpanQuery combine(BLSpanQuery left,
                           BLSpanQuery right,
                           org.apache.lucene.index.IndexReader reader)

Specified by:

combine in class ClauseCombiner

toString

public String toString()

Specified by:

toString in class ClauseCombiner