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java.lang.Object org.apache.lucene.analysis.Analyzer
public abstract class Analyzer
An Analyzer builds TokenStreams, which analyze text. It thus represents a policy for extracting index terms from text.
Typical implementations first build a Tokenizer, which breaks the stream of characters from the Reader into raw Tokens. One or more TokenFilters may then be applied to the output of the Tokenizer.
Field Summary | |
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protected boolean |
overridesTokenStreamMethod
Deprecated. |
Constructor Summary | |
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Analyzer()
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Method Summary | |
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void |
close()
Frees persistent resources used by this Analyzer |
int |
getOffsetGap(Fieldable field)
Just like getPositionIncrementGap(java.lang.String) , except for
Token offsets instead. |
int |
getPositionIncrementGap(String fieldName)
Invoked before indexing a Fieldable instance if terms have already been added to that field. |
protected Object |
getPreviousTokenStream()
Used by Analyzers that implement reusableTokenStream to retrieve previously saved TokenStreams for re-use by the same thread. |
TokenStream |
reusableTokenStream(String fieldName,
Reader reader)
Creates a TokenStream that is allowed to be re-used from the previous time that the same thread called this method. |
protected void |
setOverridesTokenStreamMethod(Class<? extends Analyzer> baseClass)
Deprecated. This is only present to preserve back-compat of classes that subclass a core analyzer and override tokenStream but not reusableTokenStream |
protected void |
setPreviousTokenStream(Object obj)
Used by Analyzers that implement reusableTokenStream to save a TokenStream for later re-use by the same thread. |
abstract TokenStream |
tokenStream(String fieldName,
Reader reader)
Creates a TokenStream which tokenizes all the text in the provided Reader. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected boolean overridesTokenStreamMethod
Constructor Detail |
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public Analyzer()
Method Detail |
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public abstract TokenStream tokenStream(String fieldName, Reader reader)
public TokenStream reusableTokenStream(String fieldName, Reader reader) throws IOException
IOException
protected Object getPreviousTokenStream()
protected void setPreviousTokenStream(Object obj)
protected void setOverridesTokenStreamMethod(Class<? extends Analyzer> baseClass)
public int getPositionIncrementGap(String fieldName)
fieldName
- Fieldable name being indexed.
tokenStream(String,Reader)
public int getOffsetGap(Fieldable field)
getPositionIncrementGap(java.lang.String)
, except for
Token offsets instead. By default this returns 1 for
tokenized fields and, as if the fields were joined
with an extra space character, and 0 for un-tokenized
fields. This method is only called if the field
produced at least one token for indexing.
field
- the field just indexed
tokenStream(String,Reader)
public void close()
close
in interface Closeable
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