Package org.apache.lucene.analysis.cjk
Class CJKTokenizer
- java.lang.Object
-
- org.apache.lucene.util.AttributeSource
-
- org.apache.lucene.analysis.TokenStream
-
- org.apache.lucene.analysis.Tokenizer
-
- org.apache.lucene.analysis.cjk.CJKTokenizer
-
- All Implemented Interfaces:
Closeable
,AutoCloseable
@Deprecated public final class CJKTokenizer extends Tokenizer
Deprecated.Use StandardTokenizer, CJKWidthFilter, CJKBigramFilter, and LowerCaseFilter instead.CJKTokenizer is designed for Chinese, Japanese, and Korean languages.The tokens returned are every two adjacent characters with overlap match.
Example: "java C1C2C3C4" will be segmented to: "java" "C1C2" "C2C3" "C3C4".
Additionally, the following is applied to Latin text (such as English):- Text is converted to lowercase.
- Numeric digits, '+', '#', and '_' are tokenized as letters.
- Full-width forms are converted to half-width forms.
-
-
Nested Class Summary
-
Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
AttributeSource.AttributeFactory, AttributeSource.State
-
-
Constructor Summary
Constructors Constructor Description CJKTokenizer(Reader in)
Deprecated.Construct a token stream processing the given input.CJKTokenizer(AttributeSource.AttributeFactory factory, Reader in)
Deprecated.CJKTokenizer(AttributeSource source, Reader in)
Deprecated.
-
Method Summary
All Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description void
end()
Deprecated.This method is called by the consumer after the last token has been consumed, afterTokenStream.incrementToken()
returnedfalse
(using the newTokenStream
API).boolean
incrementToken()
Deprecated.Returns true for the next token in the stream, or false at EOS.void
reset()
Deprecated.Resets this stream to the beginning.void
reset(Reader reader)
Deprecated.Expert: Reset the tokenizer to a new reader.-
Methods inherited from class org.apache.lucene.analysis.Tokenizer
close, correctOffset
-
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, toString
-
-
-
-
Constructor Detail
-
CJKTokenizer
public CJKTokenizer(Reader in)
Deprecated.Construct a token stream processing the given input.- Parameters:
in
- I/O reader
-
CJKTokenizer
public CJKTokenizer(AttributeSource source, Reader in)
Deprecated.
-
CJKTokenizer
public CJKTokenizer(AttributeSource.AttributeFactory factory, Reader in)
Deprecated.
-
-
Method Detail
-
incrementToken
public boolean incrementToken() throws IOException
Deprecated.Returns true for the next token in the stream, or false at EOS. See http://java.sun.com/j2se/1.3/docs/api/java/lang/Character.UnicodeBlock.html for detail.- Specified by:
incrementToken
in classTokenStream
- Returns:
- false for end of stream, true otherwise
- Throws:
IOException
- - throw IOException when read error
happened in the InputStream
-
end
public final void end()
Deprecated.Description copied from class:TokenStream
This method is called by the consumer after the last token has been consumed, afterTokenStream.incrementToken()
returnedfalse
(using the newTokenStream
API). Streams implementing the old API should upgrade to use this feature. This method can be used to perform any end-of-stream operations, such as setting the final offset of a stream. The final offset of a stream might differ from the offset of the last token eg in case one or more whitespaces followed after the last token, but aWhitespaceTokenizer
was used.- Overrides:
end
in classTokenStream
-
reset
public void reset() throws IOException
Deprecated.Description copied from class:TokenStream
Resets this stream to the beginning. This is an optional operation, so subclasses may or may not implement this method.TokenStream.reset()
is not needed for the standard indexing process. However, if the tokens of aTokenStream
are intended to be consumed more than once, it is necessary to implementTokenStream.reset()
. Note that if your TokenStream caches tokens and feeds them back again after a reset, it is imperative that you clone the tokens when you store them away (on the first pass) as well as when you return them (on future passes afterTokenStream.reset()
).- Overrides:
reset
in classTokenStream
- Throws:
IOException
-
reset
public void reset(Reader reader) throws IOException
Deprecated.Description copied from class:Tokenizer
Expert: Reset the tokenizer to a new reader. Typically, an analyzer (in its reusableTokenStream method) will use this to re-use a previously created tokenizer.- Overrides:
reset
in classTokenizer
- Throws:
IOException
-
-