package org.apache.lucene.search.spans;
/**
* 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.
*/
import java.io.IOException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Searcher;
import org.apache.lucene.search.Weight;
/** Base class for span-based queries. */
public abstract class SpanQuery extends Query {
/** Expert: Returns the matches for this query in an index. Used internally
* to search for spans. */
public abstract Spans getSpans(IndexReader reader) throws IOException;
/** Returns the name of the field matched by this query.*/
public abstract String getField();
@Override
public Weight createWeight(Searcher searcher) throws IOException {
return new SpanWeight(this, searcher);
}
}