QueryWrapperFilter.cs

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/* 
 * 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.
 */

using System;

using IndexReader = Lucene.Net.Index.IndexReader;

namespace Lucene.Net.Search
{
    
    [Serializable]
    public class QueryWrapperFilter:Filter
    {
        private class AnonymousClassDocIdSet:DocIdSet
        {
            public AnonymousClassDocIdSet(Lucene.Net.Search.Weight weight, Lucene.Net.Index.IndexReader reader, QueryWrapperFilter enclosingInstance)
            {
                InitBlock(weight, reader, enclosingInstance);
            }
            private void  InitBlock(Lucene.Net.Search.Weight weight, Lucene.Net.Index.IndexReader reader, QueryWrapperFilter enclosingInstance)
            {
                this.weight = weight;
                this.reader = reader;
                this.enclosingInstance = enclosingInstance;
            }
            private Lucene.Net.Search.Weight weight;
            private Lucene.Net.Index.IndexReader reader;
            private QueryWrapperFilter enclosingInstance;
            public QueryWrapperFilter Enclosing_Instance
            {
                get
                {
                    return enclosingInstance;
                }
                
            }
            public override DocIdSetIterator Iterator()
            {
                return weight.Scorer(reader, true, false);
            }

            public override bool IsCacheable
            {
                get { return false; }
            }
        }
        private Query query;
        
        public QueryWrapperFilter(Query query)
        {
            this.query = query;
        }
        
        public override DocIdSet GetDocIdSet(IndexReader reader)
        {
            Weight weight = query.Weight(new IndexSearcher(reader));
            return new AnonymousClassDocIdSet(weight, reader, this);
        }
        
        public override System.String ToString()
        {
            return "QueryWrapperFilter(" + query + ")";
        }
        
        public  override bool Equals(System.Object o)
        {
            if (!(o is QueryWrapperFilter))
                return false;
            return this.query.Equals(((QueryWrapperFilter) o).query);
        }
        
        public override int GetHashCode()
        {
            return query.GetHashCode() ^ unchecked((int) 0x923F64B9);
        }
    }
}