forked from apache/lucenenet
-
Notifications
You must be signed in to change notification settings - Fork 3
/
PrefixTermsEnum.cs
54 lines (50 loc) · 2 KB
/
PrefixTermsEnum.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
namespace Lucene.Net.Search
{
/*
* 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 BytesRef = Lucene.Net.Util.BytesRef;
using FilteredTermsEnum = Lucene.Net.Index.FilteredTermsEnum;
using StringHelper = Lucene.Net.Util.StringHelper;
using TermsEnum = Lucene.Net.Index.TermsEnum;
/// <summary>
/// Subclass of <see cref="FilteredTermsEnum"/> for enumerating all terms that match the
/// specified prefix filter term.
/// <para>Term enumerations are always ordered by
/// <see cref="TermsEnum.Comparer"/>. Each term in the enumeration is
/// greater than all that precede it.</para>
/// </summary>
public class PrefixTermsEnum : FilteredTermsEnum
{
private readonly BytesRef prefixRef;
public PrefixTermsEnum(TermsEnum tenum, BytesRef prefixText)
: base(tenum)
{
SetInitialSeekTerm(this.prefixRef = prefixText);
}
protected override AcceptStatus Accept(BytesRef term)
{
if (StringHelper.StartsWith(term, prefixRef))
{
return AcceptStatus.YES;
}
else
{
return AcceptStatus.END;
}
}
}
}