Package org.apache.tika.langdetect.tika

Class LanguageProfilerBuilder

java.lang.Object

org.apache.tika.langdetect.tika.LanguageProfilerBuilder

public class LanguageProfilerBuilder
extends Object

This class runs a ngram analysis over submitted text, results might be used for automatic language identification.

The similarity calculation is at experimental level. You have been warned.

Methods are provided to build new NGramProfiles profiles.

Author:

Sami Siren, Jerome Charron - http://frutch.free.fr/

Constructor Summary

Constructors

Constructor	Description
LanguageProfilerBuilder(String name)	Constructs a new ngram profile where minlen=3, maxlen=3
LanguageProfilerBuilder(String name, int minlen, int maxlen)	Constructs a new ngram profile

Method Summary

Modifier and Type	Method	Description
void	add(StringBuffer word)	Adds ngrams from a single word to this profile
void	analyze(StringBuilder text)	Analyzes a piece of text
static LanguageProfilerBuilder	create(String name, InputStream is, String encoding)	Creates a new Language profile from (preferably quite large - 5-10k of lines) text file
String	getName()
float	getSimilarity(LanguageProfilerBuilder another)	Calculates a score how well NGramProfiles match each other
List<org.apache.tika.langdetect.tika.LanguageProfilerBuilder.NGramEntry>	getSorted()	Returns a sorted list of ngrams (sort done by 1.
void	load(InputStream is)	Loads a ngram profile from an InputStream (assumes UTF-8 encoded content)
static void	main(String[] args)	main method used for testing only
protected void	normalize()	Normalizes the profile (calculates the ngrams frequencies)
void	save(OutputStream os)	Writes NGramProfile content into OutputStream, content is outputted with UTF-8 encoding
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

LanguageProfilerBuilder

public LanguageProfilerBuilder(String name,
                               int minlen,
                               int maxlen)

Constructs a new ngram profile

Parameters:

name - is the name of the profile

minlen - is the min length of ngram sequences

maxlen - is the max length of ngram sequences

LanguageProfilerBuilder

public LanguageProfilerBuilder(String name)

Constructs a new ngram profile where minlen=3, maxlen=3

Parameters:

name - is a name of profile, usually two length string

Since:

Tika 1.0

Method Detail

create

public static LanguageProfilerBuilder create(String name,
                                             InputStream is,
                                             String encoding)
                                      throws TikaException

Creates a new Language profile from (preferably quite large - 5-10k of lines) text file

Parameters:

name - to be given for the profile

is - a stream to be read

encoding - is the encoding of stream

Throws:

TikaException - if could not create a language profile

main

public static void main(String[] args)

main method used for testing only

Parameters:

args -

getName

public String getName()

Returns:

Returns the name.

add

public void add(StringBuffer word)

Adds ngrams from a single word to this profile

Parameters:

word - is the word to add

analyze

public void analyze(StringBuilder text)

Analyzes a piece of text

Parameters:

text - the text to be analyzed

normalize

protected void normalize()

Normalizes the profile (calculates the ngrams frequencies)

getSorted

public List<org.apache.tika.langdetect.tika.LanguageProfilerBuilder.NGramEntry> getSorted()

Returns a sorted list of ngrams (sort done by 1. frequency 2. sequence)

Returns:

sorted vector of ngrams

toString

public String toString()

Overrides:

toString in class Object

getSimilarity

public float getSimilarity(LanguageProfilerBuilder another)
                    throws TikaException

Calculates a score how well NGramProfiles match each other

Parameters:

another - ngram profile to compare against

Returns:

similarity 0=exact match

Throws:

TikaException - if could not calculate a score

load

public void load(InputStream is)
          throws IOException

Loads a ngram profile from an InputStream (assumes UTF-8 encoded content)

Parameters:

is - the InputStream to read

Throws:

IOException

save

public void save(OutputStream os)
          throws IOException

Writes NGramProfile content into OutputStream, content is outputted with UTF-8 encoding

Parameters:

os - the Stream to output to

Throws:

IOException