1 package org.apache.lucene.search.spans; 2 3 /** 4 * Licensed to the Apache Software Foundation (ASF) under one or more 5 * contributor license agreements. See the NOTICE file distributed with 6 * this work for additional information regarding copyright ownership. 7 * The ASF licenses this file to You under the Apache License, Version 2.0 8 * (the "License"); you may not use this file except in compliance with 9 * the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 */ 19 20 import java.io.IOException; 21 22 import org.apache.lucene.index.IndexReader; 23 import org.apache.lucene.search.Query; 24 import org.apache.lucene.search.Searcher; 25 import org.apache.lucene.search.Weight; 26 27 /** Base class for span-based queries. */ 28 public abstract class SpanQuery extends Query { 29 /** Expert: Returns the matches for this query in an index. Used internally 30 * to search for spans. */ 31 public abstract Spans getSpans(IndexReader reader) throws IOException; 32 33 /** Returns the name of the field matched by this query.*/ 34 public abstract String getField(); 35 36 @Override 37 public Weight createWeight(Searcher searcher) throws IOException { 38 return new SpanWeight(this, searcher); 39 } 40 41 }