| /* |
| * 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.icu; |
| |
| |
| import java.util.Arrays; |
| import java.util.Map; |
| |
| import com.ibm.icu.text.FilteredNormalizer2; |
| import com.ibm.icu.text.Normalizer2; |
| import com.ibm.icu.text.UnicodeSet; |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.analysis.util.TokenFilterFactory; |
| |
| /** |
| * Factory for {@link ICUNormalizer2Filter} |
| * <p> |
| * Supports the following attributes: |
| * <ul> |
| * <li>name: A <a href="http://unicode.org/reports/tr15/">Unicode Normalization Form</a>, |
| * one of 'nfc','nfkc', 'nfkc_cf'. Default is nfkc_cf. |
| * <li>mode: Either 'compose' or 'decompose'. Default is compose. Use "decompose" with nfc |
| * or nfkc, to get nfd or nfkd, respectively. |
| * <li>filter: A {@link UnicodeSet} pattern. Codepoints outside the set are |
| * always left unchanged. Default is [] (the null set, no filtering). |
| * </ul> |
| * @see ICUNormalizer2Filter |
| * @see Normalizer2 |
| * @see FilteredNormalizer2 |
| * @since 3.1.0 |
| * @lucene.spi {@value #NAME} |
| */ |
| public class ICUNormalizer2FilterFactory extends TokenFilterFactory { |
| |
| /** SPI name */ |
| public static final String NAME = "icuNormalizer2"; |
| |
| private final Normalizer2 normalizer; |
| |
| /** Creates a new ICUNormalizer2FilterFactory */ |
| public ICUNormalizer2FilterFactory(Map<String,String> args) { |
| super(args); |
| String name = get(args, "name", "nfkc_cf"); |
| String mode = get(args, "mode", Arrays.asList("compose", "decompose"), "compose"); |
| Normalizer2 normalizer = Normalizer2.getInstance |
| (null, name, "compose".equals(mode) ? Normalizer2.Mode.COMPOSE : Normalizer2.Mode.DECOMPOSE); |
| |
| String filter = get(args, "filter"); |
| if (filter != null) { |
| UnicodeSet set = new UnicodeSet(filter); |
| if (!set.isEmpty()) { |
| set.freeze(); |
| normalizer = new FilteredNormalizer2(normalizer, set); |
| } |
| } |
| if (!args.isEmpty()) { |
| throw new IllegalArgumentException("Unknown parameters: " + args); |
| } |
| this.normalizer = normalizer; |
| } |
| |
| // TODO: support custom normalization |
| |
| @Override |
| public TokenStream create(TokenStream input) { |
| return new ICUNormalizer2Filter(input, normalizer); |
| } |
| |
| @Override |
| public TokenStream normalize(TokenStream input) { |
| return create(input); |
| } |
| } |