Package org.apache.lucene.analysis.hunspell

Class Hunspell

java.lang.Object

org.apache.lucene.analysis.hunspell.Hunspell

public class Hunspell
extends Object

A spell checker based on Hunspell dictionaries. This class can be used in place of native Hunspell for many languages for spell-checking and suggesting purposes. Note that not all languages are supported yet. For example:

• Hungarian (as it doesn't only rely on dictionaries, but has some logic directly in the source code
• Languages with Unicode characters outside of the Basic Multilingual Plane
• PHONE affix file option for suggestions

The objects of this class are thread-safe.

Constructor Summary

Constructors

Constructor	Description
Hunspell(Dictionary dictionary)
Hunspell(Dictionary dictionary, TimeoutPolicy policy, Runnable checkCanceled)

Method Summary

Modifier and Type	Method	Description
List<AffixedWord>	analyzeSimpleWord(String word)
EntrySuggestion	compress(List<String> words)	Given a list of words, try to produce a smaller set of dictionary entries (with some flags) that would generate these words.
List<AffixedWord>	getAllWordForms(String root)	Generate all word forms for all dictionary entries with the given root word.
List<String>	getRoots(String word)	Find all roots that could result in the given word after case conversion and adding affixes.
boolean	spell(String word)
List<String>	suggest(String word)
List<String>	suggest(String word, long timeLimitMs)

Methods inherited from class java.lang.Object

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

Constructor Detail

Hunspell

public Hunspell(Dictionary dictionary)

Hunspell

public Hunspell(Dictionary dictionary,
                TimeoutPolicy policy,
                Runnable checkCanceled)

Parameters:

policy - a strategy determining what to do when API calls take too much time

checkCanceled - an object that's periodically called, allowing to interrupt spell-checking or suggestion generation by throwing an exception

Method Detail

spell

public boolean spell(String word)

Returns:

whether the given word's spelling is considered correct according to Hunspell rules

getRoots

public List<String> getRoots(String word)

Find all roots that could result in the given word after case conversion and adding affixes. This corresponds to the original hunspell -s (stemming) functionality.

Some affix rules are relaxed in this stemming process: e.g. explicitly forbidden words are still returned. Some of the returned roots may be synthetic and not directly occur in the *.dic file (but differ from some existing entries in case). No roots are returned for compound words.

The returned roots may be used to retrieve morphological data via Dictionary.lookupEntries(java.lang.String).

analyzeSimpleWord

public List<AffixedWord> analyzeSimpleWord(String word)

Returns:

all possible analyses of the given word with stems, prefixes, suffixed and morphological data. Note that the order of the returned objects might not correspond to the *.dic file order!

getAllWordForms

public List<AffixedWord> getAllWordForms(String root)

Generate all word forms for all dictionary entries with the given root word. The result order is stable but not specified. This is equivalent to "unmunch" from the "hunspell-tools" package.

See Also:

for finer-grained APIs

compress

public EntrySuggestion compress(List<String> words)

Given a list of words, try to produce a smaller set of dictionary entries (with some flags) that would generate these words. This is equivalent to "munch" from the "hunspell-tools" package.

See Also:

for more details and control

suggest

public List<String> suggest(String word)
                     throws SuggestionTimeoutException

Returns:

suggestions for the given misspelled word

Throws:

SuggestionTimeoutException - if the computation takes too long and TimeoutPolicy.THROW_EXCEPTION was specified in the constructor

See Also:

for finer-grained APIs and performance optimizations

suggest

public List<String> suggest(String word,
                            long timeLimitMs)
                     throws SuggestionTimeoutException

Parameters:

word - the misspelled word to calculate suggestions for

timeLimitMs - the duration limit in milliseconds, after which the associated TimeoutPolicy's effects (exception or partial result) may kick in

Throws:

SuggestionTimeoutException - if the computation takes too long and TimeoutPolicy.THROW_EXCEPTION was specified in the constructor

See Also:

for finer-grained APIs and performance optimizations