| /* |
| * 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.morfologik; |
| |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Map; |
| import java.util.Objects; |
| |
| import morfologik.stemming.Dictionary; |
| import morfologik.stemming.DictionaryMetadata; |
| import morfologik.stemming.polish.PolishStemmer; |
| |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.analysis.util.ResourceLoader; |
| import org.apache.lucene.analysis.util.ResourceLoaderAware; |
| import org.apache.lucene.analysis.util.TokenFilterFactory; |
| |
| /** |
| * Filter factory for {@link MorfologikFilter}. |
| * |
| * <p>An explicit resource name of the dictionary ({@code ".dict"}) can be |
| * provided via the <code>dictionary</code> attribute, as the example below demonstrates: |
| * <pre class="prettyprint"> |
| * <fieldType name="text_mylang" class="solr.TextField" positionIncrementGap="100"> |
| * <analyzer> |
| * <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| * <filter class="solr.MorfologikFilterFactory" dictionary="mylang.dict" /> |
| * </analyzer> |
| * </fieldType></pre> |
| * |
| * <p>If the dictionary attribute is not provided, the Polish dictionary is loaded |
| * and used by default. |
| * |
| * @see <a href="http://morfologik.blogspot.com/">Morfologik web site</a> |
| * @since 4.0.0 |
| * @lucene.spi {@value #NAME} |
| */ |
| public class MorfologikFilterFactory extends TokenFilterFactory implements ResourceLoaderAware { |
| |
| /** SPI name */ |
| public static final String NAME = "morfologik"; |
| |
| /** Dictionary resource attribute (should have {@code ".dict"} suffix), loaded from {@link ResourceLoader}. */ |
| public static final String DICTIONARY_ATTRIBUTE = "dictionary"; |
| |
| /** {@link #DICTIONARY_ATTRIBUTE} value passed to {@link #inform}. */ |
| private String resourceName; |
| |
| /** Loaded {@link Dictionary}, initialized on {@link #inform(ResourceLoader)}. */ |
| private Dictionary dictionary; |
| |
| /** Creates a new MorfologikFilterFactory */ |
| public MorfologikFilterFactory(Map<String,String> args) { |
| super(args); |
| |
| // Be specific about no-longer-supported dictionary attribute. |
| final String DICTIONARY_RESOURCE_ATTRIBUTE = "dictionary-resource"; |
| String dictionaryResource = get(args, DICTIONARY_RESOURCE_ATTRIBUTE); |
| if (dictionaryResource != null && !dictionaryResource.isEmpty()) { |
| throw new IllegalArgumentException("The " + DICTIONARY_RESOURCE_ATTRIBUTE + " attribute is no " |
| + "longer supported. Use the '" + DICTIONARY_ATTRIBUTE + "' attribute instead (see LUCENE-6833)."); |
| } |
| |
| resourceName = get(args, DICTIONARY_ATTRIBUTE); |
| |
| if (!args.isEmpty()) { |
| throw new IllegalArgumentException("Unknown parameters: " + args); |
| } |
| } |
| |
| @Override |
| public void inform(ResourceLoader loader) throws IOException { |
| if (resourceName == null) { |
| // Get the dictionary lazily, does not hold up memory. |
| this.dictionary = new PolishStemmer().getDictionary(); |
| } else { |
| try (InputStream dict = loader.openResource(resourceName); |
| InputStream meta = loader.openResource(DictionaryMetadata.getExpectedMetadataFileName(resourceName))) { |
| this.dictionary = Dictionary.read(dict, meta); |
| } |
| } |
| } |
| |
| @Override |
| public TokenStream create(TokenStream ts) { |
| return new MorfologikFilter(ts, Objects.requireNonNull(dictionary, "MorfologikFilterFactory was not fully initialized.")); |
| } |
| } |