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Lucene - Analyzer
The Analyzer class is responsible to analyze a document and get the tokens/words from the text which is to be indexed. Without analysis=, the IndexWriter cannot create index.
Class Declaration
Following is the declaration for the org.apache.lucene.analysis.Analyzer class −
public abstract class Analyzer
extends Object
implements Closeable
Class Constructors
The following table shows a class constructor −
| S.No. | Constructor & Description |
|---|---|
| 1 | protected Analyzer() |
Class Methods
The following table shows the different class methods −
| S.No. | Method & Description |
|---|---|
| 1 | void close() Frees persistent resources used by the Analyzer. |
| 2 | int getOffsetGap(Fieldable field) This is similar to getPositionIncrementGap(java.lang.String), except for Token offsets. |
| 3 | int getPositionIncrementGap(String fieldName) This is invoked before indexing a Fieldable instance if terms have already been added to that field. |
| 4 | protected Object getPreviousTokenStream() Used by Analyzers that implement reusable TokenStream to retrieve previously saved TokenStreams for re-use by the same thread. |
| 5 | 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. |
| 6 | protected void setPreviousTokenStream(Object obj) Used by Analyzers that implement reusableTokenStream to save a TokenStream for later re-use by the same thread. |
| 7 | abstract TokenStream tokenStream(String fieldName, Reader reader) Creates a TokenStream which tokenizes all the text in the provided Reader. |
Methods Inherited
This class inherits methods from the following classes −
- java.lang.Object
This analyzer splits the text in a document based on the whitespace.