beagled/Lucene.Net/Search/Spans/SpanQuery.cs

   1 /*
   2  * Copyright 2004 The Apache Software Foundation
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 using System;
  18 using IndexReader = Lucene.Net.Index.IndexReader;
  19 using Query = Lucene.Net.Search.Query;
  20 using Searcher = Lucene.Net.Search.Searcher;
  21 using Weight = Lucene.Net.Search.Weight;
  22
  23 namespace Lucene.Net.Search.Spans
  24 {
  25
  26         /// <summary>Base class for span-based queries. </summary>
  27         [Serializable]
  28         public abstract class SpanQuery:Query
  29         {
  30                 /// <summary>Expert: Returns the matches for this query in an index.  Used internally
  31                 /// to search for spans.
  32                 /// </summary>
  33                 public abstract Spans GetSpans(IndexReader reader);
  34
  35                 /// <summary>Returns the name of the field matched by this query.</summary>
  36                 public abstract System.String GetField();
  37
  38                 /// <summary>Returns a collection of all terms matched by this query.</summary>
  39                 public abstract System.Collections.ICollection GetTerms();
  40
  41                 protected internal override Weight CreateWeight(Searcher searcher)
  42                 {
  43                         return new SpanWeight(this, searcher);
  44                 }
  45         }
  46 }