Lucene.Net  3.0.3
Lucene.Net is a .NET port of the Java Lucene Indexing Library
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Properties
BooleanClause.cs
Go to the documentation of this file.
1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 using System;
19 
20 namespace Lucene.Net.Search
21 {
22 
24  [Serializable]
25  public class BooleanClause
26  {
27  private Occur occur;
28 
30  public BooleanClause(Query query, Occur occur)
31  {
32  this._query = query;
33  this.occur = occur;
34  }
35 
36  public virtual Occur Occur
37  {
38  get { return occur; }
39  set { this.occur = value; }
40  }
41 
42  private Query _query;
43 
45  public virtual Query Query
46  {
47  get { return _query; }
48  set { this._query = value; }
49  }
50 
51  public virtual bool IsProhibited
52  {
53  get { return Occur.MUST_NOT.Equals(occur); }
54  }
55 
56  public virtual bool IsRequired
57  {
58  get { return Occur.MUST.Equals(occur); }
59  }
60 
61 
63  public override bool Equals(System.Object o)
64  {
65  if (o == null || !(o is BooleanClause))
66  return false;
67  BooleanClause other = (BooleanClause) o;
68  return this.Query.Equals(other.Query) && this.occur.Equals(other.occur);
69  }
70 
72  public override int GetHashCode()
73  {
74  return Query.GetHashCode() ^ (Occur.MUST.Equals(occur)?1:0) ^ (Occur.MUST_NOT.Equals(occur)?2:0);
75  }
76 
77 
78  public override System.String ToString()
79  {
80  return OccurExtensions.ToString(occur) + Query;
81  }
82  }
83 
84  public enum Occur
85  {
86  MUST,
87  SHOULD,
88  MUST_NOT
89  }
90 
91  public static class OccurExtensions
92  {
93  public static System.String ToString(this Occur occur)
94  {
95  if (occur == Occur.MUST)
96  return "+";
97  if (occur == Occur.MUST_NOT)
98  return "-";
99  return "";
100  }
101  }
102 }