| /* |
| * 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.classification.document; |
| |
| |
| import java.io.IOException; |
| import java.util.List; |
| |
| import org.apache.lucene.classification.ClassificationResult; |
| import org.apache.lucene.document.Document; |
| |
| /** |
| * A classifier, see <code>http://en.wikipedia.org/wiki/Classifier_(mathematics)</code>, which assign classes of type |
| * <code>T</code> to a {@link org.apache.lucene.document.Document}s |
| * |
| * @lucene.experimental |
| */ |
| public interface DocumentClassifier<T> { |
| /** |
| * Assign a class (with score) to the given {@link org.apache.lucene.document.Document} |
| * |
| * @param document a {@link org.apache.lucene.document.Document} to be classified. Fields are considered features for the classification. |
| * @return a {@link org.apache.lucene.classification.ClassificationResult} holding assigned class of type <code>T</code> and score |
| * @throws java.io.IOException If there is a low-level I/O error. |
| */ |
| ClassificationResult<T> assignClass(Document document) throws IOException; |
| |
| /** |
| * Get all the classes (sorted by score, descending) assigned to the given {@link org.apache.lucene.document.Document}. |
| * |
| * @param document a {@link org.apache.lucene.document.Document} to be classified. Fields are considered features for the classification. |
| * @return the whole list of {@link org.apache.lucene.classification.ClassificationResult}, the classes and scores. Returns <code>null</code> if the classifier can't make lists. |
| * @throws java.io.IOException If there is a low-level I/O error. |
| */ |
| List<ClassificationResult<T>> getClasses(Document document) throws IOException; |
| |
| /** |
| * Get the first <code>max</code> classes (sorted by score, descending) assigned to the given text String. |
| * |
| * @param document a {@link org.apache.lucene.document.Document} to be classified. Fields are considered features for the classification. |
| * @param max the number of return list elements |
| * @return the whole list of {@link org.apache.lucene.classification.ClassificationResult}, the classes and scores. Cut for "max" number of elements. Returns <code>null</code> if the classifier can't make lists. |
| * @throws java.io.IOException If there is a low-level I/O error. |
| */ |
| List<ClassificationResult<T>> getClasses(Document document, int max) throws IOException; |
| |
| } |