| /* |
| * 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. |
| */ |
| package org.apache.lucene.analysis; |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.analysis.tokenattributes.OffsetAttribute; |
| import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute; |
| |
| /** |
| * TokenStream from a canned list of Tokens. |
| */ |
| public final class CannedTokenStream extends TokenStream { |
| private final Token[] tokens; |
| private int upto = 0; |
| private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class); |
| private final PositionIncrementAttribute posIncrAtt = addAttribute(PositionIncrementAttribute.class); |
| private final int finalOffset; |
| private final int finalPosInc; |
| |
| public CannedTokenStream(Token... tokens) { |
| this(0, 0, tokens); |
| } |
| |
| /** If you want trailing holes, pass a non-zero |
| * finalPosInc. */ |
| public CannedTokenStream(int finalPosInc, int finalOffset, Token... tokens) { |
| super(Token.TOKEN_ATTRIBUTE_FACTORY); |
| this.tokens = tokens; |
| this.finalOffset = finalOffset; |
| this.finalPosInc = finalPosInc; |
| } |
| |
| @Override |
| public void end() throws IOException { |
| super.end(); |
| posIncrAtt.setPositionIncrement(finalPosInc); |
| offsetAtt.setOffset(finalOffset, finalOffset); |
| } |
| |
| @Override |
| public void reset() throws IOException { |
| upto = 0; |
| super.reset(); |
| } |
| |
| @Override |
| public boolean incrementToken() { |
| if (upto < tokens.length) { |
| clearAttributes(); |
| // NOTE: this looks weird, casting offsetAtt to Token, but because we are using the Token class's AttributeFactory, all attributes are |
| // in fact backed by the Token class, so we just copy the current token into our Token: |
| tokens[upto++].copyTo((Token) offsetAtt); |
| return true; |
| } else { |
| return false; |
| } |
| } |
| } |