Class ChineseTokenizer
- java.lang.Object
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- org.apache.lucene.util.AttributeSource
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- org.apache.lucene.analysis.TokenStream
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- org.apache.lucene.analysis.Tokenizer
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- org.apache.lucene.analysis.cn.ChineseTokenizer
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- All Implemented Interfaces:
Closeable
,AutoCloseable
@Deprecated public final class ChineseTokenizer extends Tokenizer
Deprecated.UseStandardTokenizer
instead, which has the same functionality. This filter will be removed in Lucene 5.0Tokenize Chinese text as individual chinese characters.The difference between ChineseTokenizer and CJKTokenizer is that they have different token parsing logic.
For example, if the Chinese text "C1C2C3C4" is to be indexed:
- The tokens returned from ChineseTokenizer are C1, C2, C3, C4.
- The tokens returned from the CJKTokenizer are C1C2, C2C3, C3C4.
Therefore the index created by CJKTokenizer is much larger.
The problem is that when searching for C1, C1C2, C1C3, C4C2, C1C2C3 ... the ChineseTokenizer works, but the CJKTokenizer will not work.
- Version:
- 1.0
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
AttributeSource.AttributeFactory, AttributeSource.State
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Constructor Summary
Constructors Constructor Description ChineseTokenizer(Reader in)
Deprecated.ChineseTokenizer(AttributeSource.AttributeFactory factory, Reader in)
Deprecated.ChineseTokenizer(AttributeSource source, Reader in)
Deprecated.
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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.Consumers (i.e.,IndexWriter
) use this method to advance the stream to the next token.void
reset()
Deprecated.Resets this stream to the beginning.void
reset(Reader input)
Deprecated.Expert: Reset the tokenizer to a new reader.-
Methods inherited from class org.apache.lucene.analysis.Tokenizer
close, correctOffset
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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
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Constructor Detail
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ChineseTokenizer
public ChineseTokenizer(Reader in)
Deprecated.
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ChineseTokenizer
public ChineseTokenizer(AttributeSource source, Reader in)
Deprecated.
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ChineseTokenizer
public ChineseTokenizer(AttributeSource.AttributeFactory factory, Reader in)
Deprecated.
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Method Detail
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incrementToken
public boolean incrementToken() throws IOException
Deprecated.Description copied from class:TokenStream
Consumers (i.e.,IndexWriter
) use this method to advance the stream to the next token. Implementing classes must implement this method and update the appropriateAttributeImpl
s with the attributes of the next token.The producer must make no assumptions about the attributes after the method has been returned: the caller may arbitrarily change it. If the producer needs to preserve the state for subsequent calls, it can use
AttributeSource.captureState()
to create a copy of the current attribute state.This method is called for every token of a document, so an efficient implementation is crucial for good performance. To avoid calls to
AttributeSource.addAttribute(Class)
andAttributeSource.getAttribute(Class)
, references to allAttributeImpl
s that this stream uses should be retrieved during instantiation.To ensure that filters and consumers know which attributes are available, the attributes must be added during instantiation. Filters and consumers are not required to check for availability of attributes in
TokenStream.incrementToken()
.- Specified by:
incrementToken
in classTokenStream
- Returns:
- false for end of stream; true otherwise
- Throws:
IOException
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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
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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
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reset
public void reset(Reader input) 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
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