| using Lucene.Net.Analysis.TokenAttributes; |
| using System.IO; |
| using System.Text; |
| |
| namespace Lucene.Net.Analysis |
| { |
| /* |
| * 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; |
| |
| /// <summary> |
| /// Wraps a whitespace tokenizer with a filter that sets |
| /// the first token, and odd tokens to posinc=1, and all others |
| /// to 0, encoding the position as pos: XXX in the payload. |
| /// </summary> |
| public sealed class MockPayloadAnalyzer : Analyzer |
| { |
| protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader) |
| { |
| Tokenizer result = new MockTokenizer(reader, MockTokenizer.WHITESPACE, true); |
| return new TokenStreamComponents(result, new MockPayloadFilter(result, fieldName)); |
| } |
| } |
| |
| internal sealed class MockPayloadFilter : TokenFilter |
| { |
| internal string fieldName; |
| |
| internal int pos; |
| |
| internal int i; |
| |
| internal readonly IPositionIncrementAttribute posIncrAttr; |
| internal readonly IPayloadAttribute payloadAttr; |
| internal readonly ICharTermAttribute termAttr; |
| |
| public MockPayloadFilter(TokenStream input, string fieldName) |
| : base(input) |
| { |
| this.fieldName = fieldName; |
| pos = 0; |
| i = 0; |
| posIncrAttr = input.AddAttribute<IPositionIncrementAttribute>(); |
| payloadAttr = input.AddAttribute<IPayloadAttribute>(); |
| termAttr = input.AddAttribute<ICharTermAttribute>(); |
| } |
| |
| public override bool IncrementToken() |
| { |
| if (m_input.IncrementToken()) |
| { |
| payloadAttr.Payload = new BytesRef(Encoding.UTF8.GetBytes("pos: " + pos)); |
| int posIncr; |
| if (pos == 0 || i % 2 == 1) |
| { |
| posIncr = 1; |
| } |
| else |
| { |
| posIncr = 0; |
| } |
| posIncrAttr.PositionIncrement = posIncr; |
| pos += posIncr; |
| i++; |
| return true; |
| } |
| else |
| { |
| return false; |
| } |
| } |
| |
| public override void Reset() |
| { |
| base.Reset(); |
| i = 0; |
| pos = 0; |
| } |
| } |
| } |