| 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.LeafReaderContext; |
| import org.apache.lucene.util.Bits; |
| |
| /** |
| * Constrains search results to only match those which also match a provided |
| * query. |
| * |
| * <p> This could be used, for example, with a {@link NumericRangeQuery} on a suitably |
| * formatted date field to implement date filtering. One could re-use a single |
| * CachingWrapperFilter(QueryWrapperFilter) that matches, e.g., only documents modified |
| * within the last week. This would only need to be reconstructed once per day. |
| * @deprecated You can use {@link Query} objects directly for filtering by using |
| * {@link BooleanClause.Occur#FILTER} clauses in a {@link BooleanQuery}. |
| */ |
| @Deprecated |
| public class QueryWrapperFilter extends Filter { |
| private final Query query; |
| |
| /** Constructs a filter which only matches documents matching |
| * <code>query</code>. |
| */ |
| public QueryWrapperFilter(Query query) { |
| if (query == null) |
| throw new NullPointerException("Query may not be null"); |
| this.query = query; |
| } |
| |
| @Override |
| public Query rewrite(IndexReader reader) throws IOException { |
| return new BoostQuery(new ConstantScoreQuery(query), 0f); |
| } |
| |
| /** returns the inner Query */ |
| public final Query getQuery() { |
| return query; |
| } |
| |
| @Override |
| public DocIdSet getDocIdSet(final LeafReaderContext context, final Bits acceptDocs) throws IOException { |
| // get a private context that is used to rewrite, createWeight and score eventually |
| final LeafReaderContext privateContext = context.reader().getContext(); |
| final Weight weight = new IndexSearcher(privateContext).createNormalizedWeight(query, false); |
| |
| DocIdSet set = new DocIdSet() { |
| @Override |
| public DocIdSetIterator iterator() throws IOException { |
| return weight.scorer(privateContext); |
| } |
| |
| @Override |
| public long ramBytesUsed() { |
| return 0L; |
| } |
| }; |
| return BitsFilteredDocIdSet.wrap(set, acceptDocs); |
| } |
| |
| @Override |
| public String toString(String field) { |
| return "QueryWrapperFilter(" + query.toString(field) + ")"; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (super.equals(o) == false) { |
| return false; |
| } |
| return this.query.equals(((QueryWrapperFilter)o).query); |
| } |
| |
| @Override |
| public int hashCode() { |
| return 31 * super.hashCode() + query.hashCode(); |
| } |
| } |