X-Git-Url: https://git.mdrn.pl/pylucene.git/blobdiff_plain/a2e61f0c04805cfcb8706176758d1283c7e3a55c..aaeed5504b982cf3545252ab528713250aa33eed:/lucene-java-3.4.0/lucene/contrib/queries/src/java/org/apache/lucene/search/similar/SimilarityQueries.java

diff --git a/lucene-java-3.4.0/lucene/contrib/queries/src/java/org/apache/lucene/search/similar/SimilarityQueries.java b/lucene-java-3.4.0/lucene/contrib/queries/src/java/org/apache/lucene/search/similar/SimilarityQueries.java
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--- a/lucene-java-3.4.0/lucene/contrib/queries/src/java/org/apache/lucene/search/similar/SimilarityQueries.java
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-/**
- * Copyright 2004 The Apache Software Foundation.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.lucene.search.similar;
-
-import java.io.IOException;
-import java.io.StringReader;
-import java.util.HashSet;
-import java.util.Set;
-
-import org.apache.lucene.analysis.Analyzer;
-import org.apache.lucene.analysis.TokenStream;
-import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
-import org.apache.lucene.index.Term;
-import org.apache.lucene.search.BooleanClause;
-import org.apache.lucene.search.BooleanQuery;
-import org.apache.lucene.search.IndexSearcher;
-import org.apache.lucene.search.Query;
-import org.apache.lucene.search.TermQuery;
-
-/**
- * Simple similarity measures.
- *
- * @see MoreLikeThis
- */
-public final class SimilarityQueries
-{
-	/**
-	 *
-	 */
-	private SimilarityQueries()
-	{
-	}
-	
-	/**
-	 * Simple similarity query generators.
-	 * Takes every unique word and forms a boolean query where all words are optional.
-	 * After you get this you'll use to to query your {@link IndexSearcher} for similar docs.
-	 * The only caveat is the first hit returned <b>should be</b> your source document - you'll
-	 * need to then ignore that.
-	 *
-	 * <p>
-	 * So, if you have a code fragment like this:
-	 * <br>
-	 * <code>
-	 * Query q = formSimilaryQuery( "I use Lucene to search fast. Fast searchers are good", new StandardAnalyzer(), "contents", null);
-	 * </code>
-	 *
-	 * <p>
-	 * The query returned, in string form, will be <code>'(i use lucene to search fast searchers are good')</code>.
-	 *
-	 * <p>
-	 * The philosophy behind this method is "two documents are similar if they share lots of words".
-	 * Note that behind the scenes, Lucene's scoring algorithm will tend to give two documents a higher similarity score if the share more uncommon words.
-	 *
-	 * <P>
-	 * This method is fail-safe in that if a long 'body' is passed in and
-	 * {@link BooleanQuery#add BooleanQuery.add()} (used internally)
-	 * throws
-	 * {@link org.apache.lucene.search.BooleanQuery.TooManyClauses BooleanQuery.TooManyClauses}, the
-	 * query as it is will be returned.
-	 *
-	 * @param body the body of the document you want to find similar documents to
-	 * @param a the analyzer to use to parse the body
-	 * @param field the field you want to search on, probably something like "contents" or "body"
-	 * @param stop optional set of stop words to ignore
-	 * @return a query with all unique words in 'body'
-	 * @throws IOException this can't happen...
-	 */
-    public static Query formSimilarQuery( String body,
-										  Analyzer a,
-										  String field,
-										  Set<?> stop)
-										  throws IOException
-	{	
-		TokenStream ts = a.reusableTokenStream( field, new StringReader( body));
-		CharTermAttribute termAtt = ts.addAttribute(CharTermAttribute.class);
-		
-		BooleanQuery tmp = new BooleanQuery();
-		Set<String> already = new HashSet<String>(); // ignore dups
-		while (ts.incrementToken()) {
-		  String word = termAtt.toString();
-			// ignore opt stop words
-			if ( stop != null &&
-				 stop.contains( word)) continue;
-			// ignore dups
-			if ( ! already.add( word)) continue;
-			// add to query
-			TermQuery tq = new TermQuery( new Term( field, word));
-			try
-			{
-				tmp.add( tq, BooleanClause.Occur.SHOULD);
-			}
-			catch( BooleanQuery.TooManyClauses too)
-			{
-				// fail-safe, just return what we have, not the end of the world
-				break;
-			}
-		}
-		return tmp;
-	}
-}