| package org.apache.lucene.analysis.core; |
| |
| /** |
| * 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. |
| */ |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| |
| import org.apache.lucene.analysis.Tokenizer; |
| import org.apache.lucene.analysis.tokenattributes.OffsetAttribute; |
| import org.apache.lucene.analysis.tokenattributes.CharTermAttribute; |
| import org.apache.lucene.util.AttributeSource; |
| |
| /** |
| * Emits the entire input as a single token. |
| */ |
| public final class KeywordTokenizer extends Tokenizer { |
| /** Default read buffer size */ |
| public static final int DEFAULT_BUFFER_SIZE = 256; |
| |
| private boolean done = false; |
| private int finalOffset; |
| private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class); |
| private OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class); |
| |
| public KeywordTokenizer(Reader input) { |
| this(input, DEFAULT_BUFFER_SIZE); |
| } |
| |
| public KeywordTokenizer(Reader input, int bufferSize) { |
| super(input); |
| if (bufferSize <= 0) { |
| throw new IllegalArgumentException("bufferSize must be > 0"); |
| } |
| termAtt.resizeBuffer(bufferSize); |
| } |
| |
| public KeywordTokenizer(AttributeSource source, Reader input, int bufferSize) { |
| super(source, input); |
| if (bufferSize <= 0) { |
| throw new IllegalArgumentException("bufferSize must be > 0"); |
| } |
| termAtt.resizeBuffer(bufferSize); |
| } |
| |
| public KeywordTokenizer(AttributeFactory factory, Reader input, int bufferSize) { |
| super(factory, input); |
| if (bufferSize <= 0) { |
| throw new IllegalArgumentException("bufferSize must be > 0"); |
| } |
| termAtt.resizeBuffer(bufferSize); |
| } |
| |
| @Override |
| public final boolean incrementToken() throws IOException { |
| if (!done) { |
| clearAttributes(); |
| done = true; |
| int upto = 0; |
| char[] buffer = termAtt.buffer(); |
| while (true) { |
| final int length = input.read(buffer, upto, buffer.length-upto); |
| if (length == -1) break; |
| upto += length; |
| if (upto == buffer.length) |
| buffer = termAtt.resizeBuffer(1+buffer.length); |
| } |
| termAtt.setLength(upto); |
| finalOffset = correctOffset(upto); |
| offsetAtt.setOffset(correctOffset(0), finalOffset); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public final void end() { |
| // set final offset |
| offsetAtt.setOffset(finalOffset, finalOffset); |
| } |
| |
| @Override |
| public void reset(Reader input) throws IOException { |
| super.reset(input); |
| this.done = false; |
| } |
| } |