| using Lucene.Net.Analysis.TokenAttributes; |
| |
| 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. |
| */ |
| |
| /// <summary> |
| /// <see cref="TokenStream"/> from a canned list of <see cref="Token"/>s. |
| /// </summary> |
| public sealed class CannedTokenStream : TokenStream |
| { |
| private readonly Token[] tokens; |
| private int upto = 0; |
| private readonly ICharTermAttribute termAtt; |
| private readonly IPositionIncrementAttribute posIncrAtt; |
| private readonly IPositionLengthAttribute posLengthAtt; |
| private readonly IOffsetAttribute offsetAtt; |
| private readonly IPayloadAttribute payloadAtt; |
| private readonly int finalOffset; |
| private readonly int finalPosInc; |
| |
| public CannedTokenStream(params Token[] tokens) |
| : this(0, 0, tokens) |
| { } |
| |
| /// <summary> |
| /// If you want trailing holes, pass a non-zero |
| /// <paramref name="finalPosInc"/>. |
| /// </summary> |
| public CannedTokenStream(int finalPosInc, int finalOffset, params Token[] tokens) |
| { |
| termAtt = AddAttribute<ICharTermAttribute>(); |
| posIncrAtt = AddAttribute<IPositionIncrementAttribute>(); |
| posLengthAtt = AddAttribute<IPositionLengthAttribute>(); |
| offsetAtt = AddAttribute<IOffsetAttribute>(); |
| payloadAtt = AddAttribute<IPayloadAttribute>(); |
| |
| this.tokens = tokens; |
| this.finalOffset = finalOffset; |
| this.finalPosInc = finalPosInc; |
| } |
| |
| public override void End() |
| { |
| base.End(); |
| posIncrAtt.PositionIncrement = finalPosInc; |
| offsetAtt.SetOffset(finalOffset, finalOffset); |
| } |
| |
| public override bool IncrementToken() |
| { |
| if (upto < tokens.Length) |
| { |
| Token token = tokens[upto++]; |
| // TODO: can we just capture/restoreState so |
| // we get all attrs...? |
| ClearAttributes(); |
| termAtt.SetEmpty(); |
| termAtt.Append(token.ToString()); |
| posIncrAtt.PositionIncrement = token.PositionIncrement; |
| posLengthAtt.PositionLength = token.PositionLength; |
| offsetAtt.SetOffset(token.StartOffset, token.EndOffset); |
| payloadAtt.Payload = token.Payload; |
| return true; |
| } |
| else |
| { |
| return false; |
| } |
| } |
| } |
| } |