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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;
using Query = Lucene.Net.Search.Query;
using Searcher = Lucene.Net.Search.Searcher;
using Weight = Lucene.Net.Search.Weight;
namespace Lucene.Net.Search.Spans
{
/// <summary>Base class for span-based queries. </summary>
[Serializable]
public abstract class SpanQuery:Query
{
/// <summary>Expert: Returns the matches for this query in an index. Used internally
/// to search for spans.
/// </summary>
public abstract Spans GetSpans(IndexReader reader);
/// <summary>Returns the name of the field matched by this query.</summary>
public abstract string Field { get; }
public override Weight CreateWeight(Searcher searcher)
{
return new SpanWeight(this, searcher);
}
}
}
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