pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.4.0 / lucene / src / java / org / apache / lucene / search / ScoringRewrite.java

diff --git a/lucene-java-3.4.0/lucene/src/java/org/apache/lucene/search/ScoringRewrite.java b/lucene-java-3.4.0/lucene/src/java/org/apache/lucene/search/ScoringRewrite.java
deleted file mode 100644 (file)
index 9a3221e..0000000
--- a/lucene-java-3.4.0/lucene/src/java/org/apache/lucene/search/ScoringRewrite.java
+++ /dev/null
@@ -1,103 +0,0 @@
-package org.apache.lucene.search;
-
-/**
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You 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.
- */
-
-import java.io.IOException;
-import org.apache.lucene.index.IndexReader;
-import org.apache.lucene.index.Term;
-import org.apache.lucene.search.MultiTermQuery.RewriteMethod;
-
-/** @lucene.internal Only public to be accessible by spans package. */
-public abstract class ScoringRewrite<Q extends Query> extends TermCollectingRewrite<Q> {
-
-  /** A rewrite method that first translates each term into
-   *  {@link BooleanClause.Occur#SHOULD} clause in a
-   *  BooleanQuery, and keeps the scores as computed by the
-   *  query.  Note that typically such scores are
-   *  meaningless to the user, and require non-trivial CPU
-   *  to compute, so it's almost always better to use {@link
-   *  MultiTermQuery#CONSTANT_SCORE_AUTO_REWRITE_DEFAULT} instead.
-   *
-   *  <p><b>NOTE</b>: This rewrite method will hit {@link
-   *  BooleanQuery.TooManyClauses} if the number of terms
-   *  exceeds {@link BooleanQuery#getMaxClauseCount}.
-   *
-   *  @see #setRewriteMethod */
-  public final static ScoringRewrite<BooleanQuery> SCORING_BOOLEAN_QUERY_REWRITE = new ScoringRewrite<BooleanQuery>() {
-    @Override
-    protected BooleanQuery getTopLevelQuery() {
-      return new BooleanQuery(true);
-    }
-    
-    @Override
-    protected void addClause(BooleanQuery topLevel, Term term, float boost) {
-      final TermQuery tq = new TermQuery(term);
-      tq.setBoost(boost);
-      topLevel.add(tq, BooleanClause.Occur.SHOULD);
-    }
-    
-    // Make sure we are still a singleton even after deserializing
-    protected Object readResolve() {
-      return SCORING_BOOLEAN_QUERY_REWRITE;
-    }    
-  };
-  
-  /** Like {@link #SCORING_BOOLEAN_QUERY_REWRITE} except
-   *  scores are not computed.  Instead, each matching
-   *  document receives a constant score equal to the
-   *  query's boost.
-   * 
-   *  <p><b>NOTE</b>: This rewrite method will hit {@link
-   *  BooleanQuery.TooManyClauses} if the number of terms
-   *  exceeds {@link BooleanQuery#getMaxClauseCount}.
-   *
-   *  @see #setRewriteMethod */
-  public final static RewriteMethod CONSTANT_SCORE_BOOLEAN_QUERY_REWRITE = new RewriteMethod() {
-    @Override
-    public Query rewrite(IndexReader reader, MultiTermQuery query) throws IOException {
-      final BooleanQuery bq = SCORING_BOOLEAN_QUERY_REWRITE.rewrite(reader, query);
-      // TODO: if empty boolean query return NullQuery?
-      if (bq.clauses().isEmpty())
-        return bq;
-      // strip the scores off
-      final Query result = new ConstantScoreQuery(bq);
-      result.setBoost(query.getBoost());
-      return result;
-    }
-
-    // Make sure we are still a singleton even after deserializing
-    protected Object readResolve() {
-      return CONSTANT_SCORE_BOOLEAN_QUERY_REWRITE;
-    }
-  };
-
-  @Override
-  public Q rewrite(final IndexReader reader, final MultiTermQuery query) throws IOException {
-    final Q result = getTopLevelQuery();
-    final int[] size = new int[1]; // "trick" to be able to make it final
-    collectTerms(reader, query, new TermCollector() {
-      public boolean collect(Term t, float boost) throws IOException {
-        addClause(result, t, query.getBoost() * boost);
-        size[0]++;
-        return true;
-      }
-    });
-    query.incTotalNumberOfTerms(size[0]);
-    return result;
-  }
-}