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package org.apache.lucene.search.spans;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.io.IOException;
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import org.apache.lucene.index.IndexReader;
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import org.apache.lucene.search.Query;
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import org.apache.lucene.search.Searcher;
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import org.apache.lucene.search.Weight;
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/** Base class for span-based queries. */
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public abstract class SpanQuery extends Query {
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/** Expert: Returns the matches for this query in an index. Used internally
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* to search for spans. */
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public abstract Spans getSpans(IndexReader reader) throws IOException;
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/** Returns the name of the field matched by this query.*/
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public abstract String getField();
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public Weight createWeight(Searcher searcher) throws IOException {
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return new SpanWeight(this, searcher);