beagled/Lucene.Net/Search/WildcardQuery.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 Term = Lucene.Net.Index.Term;
  20
  21 namespace Lucene.Net.Search
  22 {
  23
  24         /// <summary>Implements the wildcard search query. Supported wildcards are <code>*</code>, which
  25         /// matches any character sequence (including the empty one), and <code>?</code>,
  26         /// which matches any single character. Note this query can be slow, as it
  27         /// needs to iterate over many terms. In order to prevent extremely slow WildcardQueries,
  28         /// a Wildcard term should not start with one of the wildcards <code>*</code> or
  29         /// <code>?</code>.
  30         ///
  31         /// </summary>
  32         /// <seealso cref="WildcardTermEnum">
  33         /// </seealso>
  34         [Serializable]
  35         public class WildcardQuery : MultiTermQuery
  36         {
  37                 public WildcardQuery(Term term) : base(term)
  38                 {
  39                 }
  40
  41                 protected internal override FilteredTermEnum GetEnum(IndexReader reader)
  42                 {
  43                         return new WildcardTermEnum(reader, GetTerm());
  44                 }
  45
  46                 public  override bool Equals(System.Object o)
  47                 {
  48                         if (o is WildcardQuery)
  49                                 return base.Equals(o);
  50
  51                         return false;
  52                 }
  53                 public override int GetHashCode()
  54                 {
  55                         return base.GetHashCode();
  56                 }
  57         }
  58 }