standardanalyzer.java

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package org.apache.lucene.analysis.standard;

/* ====================================================================
 * The Apache Software License, Version 1.1
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 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Apache" and "Apache Software Foundation" and
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 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
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import org.apache.lucene.analysis.*;
import java.io.Reader;
import java.util.Hashtable;

/** Filters {@link StandardTokenizer} with {@link StandardFilter}, {@link
 * LowerCaseFilter} and {@link StopFilter}. */
public class StandardAnalyzer extends Analyzer {
    private Hashtable stopTable;

    /** An array containing some common English words that are usually not
	useful for searching. */
    public static final String[] STOP_WORDS = {
	"a", "and", "are", "as", "at", "be", "but", "by",
	"for", "if", "in", "into", "is", "it",
	"no", "not", "of", "on", "or", "s", "such",
	"t", "that", "the", "their", "then", "there", "these",
	"they", "this", "to", "was", "will", "with"
    };

    /** Builds an analyzer. */
    public StandardAnalyzer() {
	this(STOP_WORDS);
    }

    /** Builds an analyzer with the given stop words. */
    public StandardAnalyzer(String[] stopWords) {
	stopTable = StopFilter.makeStopTable(stopWords);
    }

    /** Constructs a {@link StandardTokenizer} filtered by a {@link
	StandardFilter}, a {@link LowerCaseFilter} and a {@link StopFilter}. */
    public final TokenStream tokenStream(String fieldName, Reader reader) {
	TokenStream result = new StandardTokenizer(reader);
	result = new StandardFilter(result);
	result = new LowerCaseFilter(result);
	result = new StopFilter(result, stopTable);
	return result;
    }
}