org.apache.lucene.analysis.ngram
Class NGramTokenizer

java.lang.Object
  extended by org.apache.lucene.util.AttributeSource
      extended by org.apache.lucene.analysis.TokenStream
          extended by org.apache.lucene.analysis.Tokenizer
              extended by org.apache.lucene.analysis.ngram.NGramTokenizer
All Implemented Interfaces:
Closeable

public final class NGramTokenizer
extends Tokenizer

Tokenizes the input into n-grams of the given size(s).


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
AttributeSource.AttributeFactory, AttributeSource.State
 
Field Summary
static int DEFAULT_MAX_NGRAM_SIZE
           
static int DEFAULT_MIN_NGRAM_SIZE
           
 
Fields inherited from class org.apache.lucene.analysis.Tokenizer
input
 
Constructor Summary
NGramTokenizer(AttributeSource.AttributeFactory factory, Reader input, int minGram, int maxGram)
          Creates NGramTokenizer with given min and max n-grams.
NGramTokenizer(AttributeSource source, Reader input, int minGram, int maxGram)
          Creates NGramTokenizer with given min and max n-grams.
NGramTokenizer(Reader input)
          Creates NGramTokenizer with default min and max n-grams.
NGramTokenizer(Reader input, int minGram, int maxGram)
          Creates NGramTokenizer with given min and max n-grams.
 
Method Summary
 void end()
           
 boolean incrementToken()
          Returns the next token in the stream, or null at EOS.
 void reset()
           
 
Methods inherited from class org.apache.lucene.analysis.Tokenizer
close, correctOffset, setReader
 
Methods inherited from class org.apache.lucene.util.AttributeSource
addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

DEFAULT_MIN_NGRAM_SIZE

public static final int DEFAULT_MIN_NGRAM_SIZE
See Also:
Constant Field Values

DEFAULT_MAX_NGRAM_SIZE

public static final int DEFAULT_MAX_NGRAM_SIZE
See Also:
Constant Field Values
Constructor Detail

NGramTokenizer

public NGramTokenizer(Reader input,
                      int minGram,
                      int maxGram)
Creates NGramTokenizer with given min and max n-grams.

Parameters:
input - Reader holding the input to be tokenized
minGram - the smallest n-gram to generate
maxGram - the largest n-gram to generate

NGramTokenizer

public NGramTokenizer(AttributeSource source,
                      Reader input,
                      int minGram,
                      int maxGram)
Creates NGramTokenizer with given min and max n-grams.

Parameters:
source - AttributeSource to use
input - Reader holding the input to be tokenized
minGram - the smallest n-gram to generate
maxGram - the largest n-gram to generate

NGramTokenizer

public NGramTokenizer(AttributeSource.AttributeFactory factory,
                      Reader input,
                      int minGram,
                      int maxGram)
Creates NGramTokenizer with given min and max n-grams.

Parameters:
factory - AttributeSource.AttributeFactory to use
input - Reader holding the input to be tokenized
minGram - the smallest n-gram to generate
maxGram - the largest n-gram to generate

NGramTokenizer

public NGramTokenizer(Reader input)
Creates NGramTokenizer with default min and max n-grams.

Parameters:
input - Reader holding the input to be tokenized
Method Detail

incrementToken

public boolean incrementToken()
                       throws IOException
Returns the next token in the stream, or null at EOS.

Specified by:
incrementToken in class TokenStream
Throws:
IOException

end

public void end()
Overrides:
end in class TokenStream

reset

public void reset()
           throws IOException
Overrides:
reset in class TokenStream
Throws:
IOException


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