Package org.apache.tika.langdetect.tika
Class TikaLanguageDetector
java.lang.Object
org.apache.tika.language.detect.LanguageDetector
org.apache.tika.langdetect.tika.TikaLanguageDetector
This is Tika's original legacy, homegrown language detector.
As it is currently implemented, it computes vector distance
of trigrams between input string and language models.
Because it works only on trigrams, it is not suitable for short texts.
There are better performing language detectors. This module is still here in the hopes that we'll get around to improving it, because it is elegant and could be fairly trivially improved.
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Field Summary
Fields inherited from class org.apache.tika.language.detect.LanguageDetector
mixedLanguages, shortText
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionvoid
addText
(char[] cbuf, int off, int len) Add statistics about this text for the current document.Detect languages based on previously submitted text (via addText calls).boolean
Provide information about whether a model exists for a specific language.Load (or re-load) all available language models.loadModels
(Set<String> languages) Load (or re-load) the models specified in. void
reset()
Reset statistics about the current document being processednot supportedMethods inherited from class org.apache.tika.language.detect.LanguageDetector
addText, detect, detect, detectAll, getDefaultLanguageDetector, getLanguageDetectors, getLanguageDetectors, hasEnoughText, isMixedLanguages, isShortText, setMixedLanguages, setShortText
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Constructor Details
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TikaLanguageDetector
public TikaLanguageDetector()
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Method Details
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loadModels
Description copied from class:LanguageDetector
Load (or re-load) all available language models. This must be called after any settings that would impact the models being loaded (e.g. mixed language/short text), but before any of the document processing routines (below) are called. Note that it only needs to be called once.- Specified by:
loadModels
in classLanguageDetector
- Returns:
- this
- Throws:
IOException
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loadModels
Description copied from class:LanguageDetector
Load (or re-load) the models specified in. These use the ISO 639-1 names, with an optional "- " for more specific specification (e.g. "zh-CN" for Chinese in China). - Specified by:
loadModels
in classLanguageDetector
- Parameters:
languages
- list of target languages.- Returns:
- this
- Throws:
IOException
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hasModel
Description copied from class:LanguageDetector
Provide information about whether a model exists for a specific language.- Specified by:
hasModel
in classLanguageDetector
- Parameters:
language
- ISO 639-1 name for language- Returns:
- true if a model for this language exists.
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setPriors
not supported- Specified by:
setPriors
in classLanguageDetector
- Parameters:
languageProbabilities
- Map from language to probability- Returns:
- Throws:
IOException
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reset
public void reset()Description copied from class:LanguageDetector
Reset statistics about the current document being processed- Specified by:
reset
in classLanguageDetector
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addText
public void addText(char[] cbuf, int off, int len) Description copied from class:LanguageDetector
Add statistics about this text for the current document. Note that we assume an implicit word break exists before/after each of these runs of text.- Specified by:
addText
in classLanguageDetector
- Parameters:
cbuf
- Character bufferoff
- Offset into cbuf to first character in the run of textlen
- Number of characters in the run of text.
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detectAll
Description copied from class:LanguageDetector
Detect languages based on previously submitted text (via addText calls).- Specified by:
detectAll
in classLanguageDetector
- Returns:
- list of all possible languages with at least medium confidence, sorted by confidence from highest to lowest. There will always be at least one result, which might have a confidence of NONE.
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