+++ /dev/null
-package org.apache.lucene.analysis.miscellaneous;
-
-/**
- * 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.util.Map;
-
-import org.apache.lucene.analysis.CharArrayMap;
-import org.apache.lucene.analysis.TokenFilter;
-import org.apache.lucene.analysis.TokenStream;
-import org.apache.lucene.analysis.tokenattributes.KeywordAttribute;
-import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
-import org.apache.lucene.util.Version;
-
-/**
- * Provides the ability to override any {@link KeywordAttribute} aware stemmer
- * with custom dictionary-based stemming.
- */
-public final class StemmerOverrideFilter extends TokenFilter {
- private final CharArrayMap<String> dictionary;
-
- private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
- private final KeywordAttribute keywordAtt = addAttribute(KeywordAttribute.class);
-
- /**
- * Create a new StemmerOverrideFilter, performing dictionary-based stemming
- * with the provided <code>dictionary</code>.
- * <p>
- * Any dictionary-stemmed terms will be marked with {@link KeywordAttribute}
- * so that they will not be stemmed with stemmers down the chain.
- * </p>
- */
- public StemmerOverrideFilter(Version matchVersion, TokenStream input,
- Map<?,String> dictionary) {
- super(input);
- this.dictionary = dictionary instanceof CharArrayMap ?
- (CharArrayMap<String>) dictionary : CharArrayMap.copy(matchVersion, dictionary);
- }
-
- @Override
- public boolean incrementToken() throws IOException {
- if (input.incrementToken()) {
- if (!keywordAtt.isKeyword()) { // don't muck with already-keyworded terms
- String stem = dictionary.get(termAtt.buffer(), 0, termAtt.length());
- if (stem != null) {
- termAtt.setEmpty().append(stem);
- keywordAtt.setKeyword(true);
- }
- }
- return true;
- } else {
- return false;
- }
- }
-}