| package org.apache.solr.search; |
| |
| import org.apache.lucene.queries.function.ValueSource; |
| import org.apache.lucene.search.*; |
| import org.apache.lucene.util.Bits; |
| import org.apache.lucene.index.IndexReader; |
| import org.apache.lucene.index.AtomicReaderContext; |
| import org.apache.solr.common.SolrException; |
| |
| import java.io.IOException; |
| import java.util.Set; |
| import java.util.Map; |
| |
| /* |
| * 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. |
| */ |
| |
| /** |
| * 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 ConstantScoreQuery implements ExtendedQuery { |
| boolean cache = true; // cache by default |
| int cost; |
| |
| public SolrConstantScoreQuery(Filter filter) { |
| super(filter); |
| } |
| |
| /** Returns the encapsulated filter */ |
| @Override |
| 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; |
| } |
| |
| |
| @Override |
| public Query rewrite(IndexReader reader) throws IOException { |
| return this; |
| } |
| |
| @Override |
| public void extractTerms(Set terms) { |
| // OK to not add any terms when used for MultiSearcher, |
| // but may not be OK for highlighting |
| } |
| |
| protected class ConstantWeight extends Weight { |
| private float queryNorm; |
| private float queryWeight; |
| private Map context; |
| |
| public ConstantWeight(IndexSearcher searcher) throws IOException { |
| this.context = ValueSource.newContext(searcher); |
| if (filter instanceof SolrFilter) |
| ((SolrFilter)filter).createWeight(context, searcher); |
| } |
| |
| @Override |
| public Query getQuery() { |
| return SolrConstantScoreQuery.this; |
| } |
| |
| @Override |
| public float getValueForNormalization() throws IOException { |
| queryWeight = getBoost(); |
| return queryWeight * queryWeight; |
| } |
| |
| @Override |
| public void normalize(float norm, float topLevelBoost) { |
| this.queryNorm = norm * topLevelBoost; |
| queryWeight *= this.queryNorm; |
| } |
| |
| @Override |
| public Scorer scorer(AtomicReaderContext context, Bits acceptDocs) throws IOException { |
| return new ConstantScorer(context, this, queryWeight, acceptDocs); |
| } |
| |
| @Override |
| public Explanation explain(AtomicReaderContext context, int doc) throws IOException { |
| |
| ConstantScorer cs = new ConstantScorer(context, this, queryWeight, context.reader().getLiveDocs()); |
| boolean exists = cs.docIdSetIterator.advance(doc) == doc; |
| |
| ComplexExplanation result = new ComplexExplanation(); |
| |
| if (exists) { |
| result.setDescription("ConstantScoreQuery(" + filter |
| + "), product of:"); |
| result.setValue(queryWeight); |
| result.setMatch(Boolean.TRUE); |
| result.addDetail(new Explanation(getBoost(), "boost")); |
| result.addDetail(new Explanation(queryNorm,"queryNorm")); |
| } else { |
| result.setDescription("ConstantScoreQuery(" + filter |
| + ") doesn't match id " + doc); |
| result.setValue(0); |
| result.setMatch(Boolean.FALSE); |
| } |
| return result; |
| } |
| } |
| |
| protected class ConstantScorer extends Scorer { |
| final DocIdSetIterator docIdSetIterator; |
| final float theScore; |
| final Bits acceptDocs; |
| int doc = -1; |
| |
| public ConstantScorer(AtomicReaderContext context, ConstantWeight w, float theScore, Bits acceptDocs) throws IOException { |
| super(w); |
| this.theScore = theScore; |
| this.acceptDocs = acceptDocs; |
| DocIdSet docIdSet = filter instanceof SolrFilter ? ((SolrFilter)filter).getDocIdSet(w.context, context, acceptDocs) : filter.getDocIdSet(context, acceptDocs); |
| if (docIdSet == null) { |
| docIdSetIterator = DocIdSetIterator.empty(); |
| } else { |
| DocIdSetIterator iter = docIdSet.iterator(); |
| if (iter == null) { |
| docIdSetIterator = DocIdSetIterator.empty(); |
| } else { |
| docIdSetIterator = iter; |
| } |
| } |
| } |
| |
| @Override |
| public int nextDoc() throws IOException { |
| return docIdSetIterator.nextDoc(); |
| } |
| |
| @Override |
| public int docID() { |
| return docIdSetIterator.docID(); |
| } |
| |
| @Override |
| public float score() throws IOException { |
| return theScore; |
| } |
| |
| @Override |
| public int freq() throws IOException { |
| return 1; |
| } |
| |
| @Override |
| public int advance(int target) throws IOException { |
| return docIdSetIterator.advance(target); |
| } |
| |
| @Override |
| public long cost() { |
| return docIdSetIterator.cost(); |
| } |
| } |
| |
| @Override |
| public Weight createWeight(IndexSearcher searcher) { |
| try { |
| return new SolrConstantScoreQuery.ConstantWeight(searcher); |
| } catch (IOException e) { |
| // TODO: remove this if ConstantScoreQuery.createWeight adds IOException |
| throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e); |
| } |
| } |
| |
| /** Prints a user-readable version of this query. */ |
| @Override |
| public String toString(String field) { |
| return ExtendedQueryBase.getOptionsString(this) + "ConstantScore(" + filter.toString() |
| + (getBoost()==1.0 ? ")" : "^" + getBoost()); |
| } |
| |
| /** Returns true if <code>o</code> is equal to this. */ |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (!(o instanceof SolrConstantScoreQuery)) return false; |
| SolrConstantScoreQuery other = (SolrConstantScoreQuery)o; |
| return this.getBoost()==other.getBoost() && filter.equals(other.filter); |
| } |
| |
| /** Returns a hash code value for this object. */ |
| @Override |
| public int hashCode() { |
| // Simple add is OK since no existing filter hashcode has a float component. |
| return filter.hashCode() + Float.floatToIntBits(getBoost()); |
| } |
| |
| } |