content: /**
   * 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 org.apache.lucene.search.Filter;
  import org.apache.lucene.search.Searcher;
  import org.apache.lucene.search.DocIdSet;
  import org.apache.lucene.index.IndexReader;
  
  import java.util.Map;
  import java.io.IOException;
  
  
  /** A SolrFilter extends the Lucene Filter and adds extra semantics such as passing on
   * weight context info for function queries.
   *
   * Experimental and subject to change.
   */
  public abstract class SolrFilter extends Filter {
  
    /** Implementations should propagate createWeight to sub-ValueSources which can store weight info in the context.
     * The context object will be passed to getDocIdSet() where this info can be retrieved. */
    public abstract void createWeight(Map context, Searcher searcher) throws IOException;
    
    public abstract DocIdSet getDocIdSet(Map context, IndexReader reader) throws IOException;
  
    @Override
    public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
      return getDocIdSet(null, reader);
    }
  }
  