1 package org.apache.lucene.search.spans;
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
11 * http://www.apache.org/licenses/LICENSE-2.0
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.
20 import java.io.IOException;
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;
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;
33 /** Returns the name of the field matched by this query.*/
34 public abstract String getField();
37 public Weight createWeight(Searcher searcher) throws IOException {
38 return new SpanWeight(this, searcher);