| /* |
| * 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.boost; |
| |
| import org.apache.lucene.analysis.TokenFilter; |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.analysis.tokenattributes.CharTermAttribute; |
| import org.apache.lucene.search.BoostAttribute; |
| |
| import java.io.IOException; |
| |
| |
| /** |
| * Characters before the delimiter are the "token", those after are the boost. |
| * <p> |
| * For example, if the delimiter is '|', then for the string "foo|0.7", foo is the token |
| * and 0.7 is the boost. |
| * <p> |
| * Note make sure your Tokenizer doesn't split on the delimiter, or this won't work |
| */ |
| public final class DelimitedBoostTokenFilter extends TokenFilter { |
| private final char delimiter; |
| private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class); |
| private final BoostAttribute boostAtt = addAttribute(BoostAttribute.class); |
| |
| public DelimitedBoostTokenFilter(TokenStream input, char delimiter) { |
| super(input); |
| this.delimiter = delimiter; |
| } |
| |
| @Override |
| public boolean incrementToken() throws IOException { |
| if (input.incrementToken()) { |
| final char[] buffer = termAtt.buffer(); |
| final int length = termAtt.length(); |
| for (int i = 0; i < length; i++) { |
| if (buffer[i] == delimiter) { |
| float boost = Float.parseFloat(new String(buffer, i + 1, (length - (i + 1)))); |
| boostAtt.setBoost(boost); |
| termAtt.setLength(i); |
| return true; |
| } |
| } |
| return true; |
| } else { |
| return false; |
| } |
| } |
| } |