FragmentChecker (Lucene 9.6.0 common API)

All Known Implementing Classes:

NGramFragmentChecker
```
public interface FragmentChecker
```
An oracle for quickly checking that a specific part of a word can never be a valid word. This allows speeding up the "Modification" part of Suggester by avoiding expensive checks on impossible words. Implementations may use character case, n-grams or whatever they like.

See Also:

NGramFragmentChecker

Field Summary

Fields
Modifier and Type Field Description

static FragmentChecker EVERYTHING_POSSIBLE

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`hasImpossibleFragmentAround(CharSequence word, int start, int end)`	Check if the given word range intersects any fragment which is impossible in the current language.

- Field Detail
  - EVERYTHING_POSSIBLE
```
static final FragmentChecker EVERYTHING_POSSIBLE
```
- Method Detail
  - hasImpossibleFragmentAround
```
boolean hasImpossibleFragmentAround(CharSequence word,
                                    int start,
                                    int end)
```
    Check if the given word range intersects any fragment which is impossible in the current language. For example, if the word is "aaax", and there are no "aaa" combinations in words accepted by the spellchecker (but "aax" is valid), then true can be returned for all ranges in 0..3, but not for 3..4.
    The implementation must be monotonic: if some range is considered impossible, larger ranges encompassing it should also produce true.
    
    Parameters:
    
    word - the whole word being checked for impossible substrings
    
    start - the start of the range in question, inclusive
    
    end - the end of the range in question, inclusive, not smaller than start