| /* |
| * 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. |
| */ |
| package org.apache.solr.search; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| import java.util.Objects; |
| |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.queries.function.ValueSource; |
| import org.apache.lucene.search.ConstantScoreScorer; |
| import org.apache.lucene.search.ConstantScoreWeight; |
| import org.apache.lucene.search.DocIdSet; |
| import org.apache.lucene.search.DocIdSetIterator; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.Query; |
| import org.apache.lucene.search.QueryVisitor; |
| import org.apache.lucene.search.ScoreMode; |
| import org.apache.lucene.search.Scorer; |
| import org.apache.lucene.search.Weight; |
| |
| /** |
| * A query that wraps a filter and simply returns a constant score equal to the |
| * query boost for every document in the filter. This Solr extension also supports |
| * weighting of a SolrFilter. |
| * |
| * Experimental and subject to change. |
| */ |
| public class SolrConstantScoreQuery extends Query implements ExtendedQuery { |
| private final Filter filter; |
| boolean cache = true; // cache by default |
| int cost; |
| |
| public SolrConstantScoreQuery(Filter filter) { |
| this.filter = filter; |
| } |
| |
| /** Returns the encapsulated filter */ |
| public Filter getFilter() { |
| return filter; |
| } |
| |
| @Override |
| public void setCache(boolean cache) { |
| this.cache = cache; |
| } |
| |
| @Override |
| public boolean getCache() { |
| return cache; |
| } |
| |
| @Override |
| public void setCacheSep(boolean cacheSep) { |
| } |
| |
| @Override |
| public boolean getCacheSep() { |
| return false; |
| } |
| |
| @Override |
| public void setCost(int cost) { |
| this.cost = cost; |
| } |
| |
| @Override |
| public int getCost() { |
| return cost; |
| } |
| |
| protected class ConstantWeight extends ConstantScoreWeight { |
| @SuppressWarnings({"rawtypes"}) |
| private Map context; |
| private ScoreMode scoreMode; |
| |
| public ConstantWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) throws IOException { |
| super(SolrConstantScoreQuery.this, boost); |
| this.scoreMode = scoreMode; |
| this.context = ValueSource.newContext(searcher); |
| if (filter instanceof SolrFilter) |
| ((SolrFilter)filter).createWeight(context, searcher); |
| } |
| |
| @Override |
| public Scorer scorer(LeafReaderContext context) throws IOException { |
| DocIdSet docIdSet = filter instanceof SolrFilter ? ((SolrFilter)filter).getDocIdSet(this.context, context, null) : filter.getDocIdSet(context, null); |
| if (docIdSet == null) { |
| return null; |
| } |
| DocIdSetIterator iterator = docIdSet.iterator(); |
| if (iterator == null) { |
| return null; |
| } |
| return new ConstantScoreScorer(this, score(), scoreMode, iterator); |
| } |
| |
| @Override |
| public boolean isCacheable(LeafReaderContext ctx) { |
| return false; |
| } |
| |
| } |
| |
| @Override |
| public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) throws IOException { |
| return new SolrConstantScoreQuery.ConstantWeight(searcher, scoreMode, boost); |
| } |
| |
| /** Prints a user-readable version of this query. */ |
| @Override |
| public String toString(String field) { |
| return ExtendedQueryBase.getOptionsString(this) + "ConstantScore(" + filter.toString() + ")"; |
| } |
| |
| /** Returns true if <code>o</code> is equal to this. */ |
| @Override |
| public boolean equals(Object other) { |
| return sameClassAs(other) && |
| Objects.equals(filter, ((SolrConstantScoreQuery) other).filter); |
| } |
| |
| /** Returns a hash code value for this object. */ |
| @Override |
| public int hashCode() { |
| return 31 * classHash() + filter.hashCode(); |
| } |
| |
| @Override |
| public void visit(QueryVisitor visitor) { |
| visitor.visitLeaf(this); |
| } |
| |
| } |