| /* |
| * 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.queryparser.ext; |
| |
| import org.apache.lucene.queryparser.classic.ParseException; |
| import org.apache.lucene.search.Query; |
| |
| /** |
| * This class represents an extension base class to the Lucene standard |
| * {@link org.apache.lucene.queryparser.classic.QueryParser}. The |
| * {@link org.apache.lucene.queryparser.classic.QueryParser} is generated by the JavaCC |
| * parser generator. Changing or adding functionality or syntax in the standard |
| * query parser requires changes to the JavaCC source file. To enable extending |
| * the standard query parser without changing the JavaCC sources and re-generate |
| * the parser the {@link ParserExtension} can be customized and plugged into an |
| * instance of {@link ExtendableQueryParser}, a direct subclass of |
| * {@link org.apache.lucene.queryparser.classic.QueryParser}. |
| * |
| * @see Extensions |
| * @see ExtendableQueryParser |
| */ |
| public abstract class ParserExtension { |
| |
| /** |
| * Processes the given {@link ExtensionQuery} and returns a corresponding |
| * {@link Query} instance. Subclasses must either return a {@link Query} |
| * instance or raise a {@link ParseException}. This method must not return |
| * <code>null</code>. |
| * |
| * @param query |
| * the extension query |
| * @return a new query instance |
| * @throws ParseException |
| * if the query can not be parsed. |
| */ |
| public abstract Query parse(final ExtensionQuery query) throws ParseException; |
| |
| } |