Package org.apache.lucene.search.uhighlight

Class LengthGoalBreakIterator

java.lang.Object

java.text.BreakIterator

org.apache.lucene.search.uhighlight.LengthGoalBreakIterator

All Implemented Interfaces:

Cloneable

public class LengthGoalBreakIterator
extends BreakIterator

Wraps another BreakIterator to skip past breaks that would result in passages that are too short. It's still possible to get a short passage but only at the very end of the input text.

Important: This is not a general purpose BreakIterator; it's only designed to work in a way compatible with the UnifiedHighlighter. Some assumptions are checked with Java assertions.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

Fields inherited from class java.text.BreakIterator

DONE

Method Summary

Modifier and Type	Method	Description
Object	clone()
static LengthGoalBreakIterator	createClosestToLength(BreakIterator baseIter, int targetLength)	Deprecated.
static LengthGoalBreakIterator	createClosestToLength(BreakIterator baseIter, int targetLength, float fragmentAlignment)	Breaks will be on average targetLength apart; the closest break to this target (before or after) is chosen.
static LengthGoalBreakIterator	createMinLength(BreakIterator baseIter, int minLength)	Deprecated.
static LengthGoalBreakIterator	createMinLength(BreakIterator baseIter, int minLength, float fragmentAlignment)	Breaks will be at least minLength apart (to the extent possible), while trying to position the match inside the fragment according to fragmentAlignment.
int	current()
int	first()
int	following(int matchEndIndex)
CharacterIterator	getText()
boolean	isBoundary(int offset)
int	last()
int	next()
int	next(int n)
int	preceding(int matchStartIndex)
int	previous()
void	setText(String newText)
void	setText(CharacterIterator newText)
String	toString()

Methods inherited from class java.text.BreakIterator

getAvailableLocales, getCharacterInstance, getCharacterInstance, getLineInstance, getLineInstance, getSentenceInstance, getSentenceInstance, getWordInstance, getWordInstance

Methods inherited from class java.lang.Object

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

Method Detail

createMinLength

public static LengthGoalBreakIterator createMinLength(BreakIterator baseIter,
                                                      int minLength,
                                                      float fragmentAlignment)

Breaks will be at least minLength apart (to the extent possible), while trying to position the match inside the fragment according to fragmentAlignment.

createMinLength

@Deprecated
public static LengthGoalBreakIterator createMinLength(BreakIterator baseIter,
                                                      int minLength)

Deprecated.

For backwards compatibility you can initialise the break iterator without fragmentAlignment.

createClosestToLength

public static LengthGoalBreakIterator createClosestToLength(BreakIterator baseIter,
                                                            int targetLength,
                                                            float fragmentAlignment)

Breaks will be on average targetLength apart; the closest break to this target (before or after) is chosen. The match will be positioned according to fragmentAlignment as much as possible.

createClosestToLength

@Deprecated
public static LengthGoalBreakIterator createClosestToLength(BreakIterator baseIter,
                                                            int targetLength)

Deprecated.

For backwards compatibility you can initialise the break iterator without fragmentAlignment.

toString

public String toString()

Overrides:

toString in class Object

clone

public Object clone()

Overrides:

clone in class BreakIterator

getText

public CharacterIterator getText()

Specified by:

getText in class BreakIterator

setText

public void setText(String newText)

Overrides:

setText in class BreakIterator

setText

public void setText(CharacterIterator newText)

Specified by:

setText in class BreakIterator

current

public int current()

Specified by:

current in class BreakIterator

first

public int first()

Specified by:

first in class BreakIterator

last

public int last()

Specified by:

last in class BreakIterator

next

public int next(int n)

Specified by:

next in class BreakIterator

next

public int next()

Specified by:

next in class BreakIterator

previous

public int previous()

Specified by:

previous in class BreakIterator

following

public int following(int matchEndIndex)

Specified by:

following in class BreakIterator

preceding

public int preceding(int matchStartIndex)

Overrides:

preceding in class BreakIterator

isBoundary

public boolean isBoundary(int offset)

Overrides:

isBoundary in class BreakIterator