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Lucene example source code file (ParserExtension.java)

This example Lucene source code file (ParserExtension.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

extensionquery, extensionquery, parseexception, parseexception, parserextension, parserextension, query, query

The Lucene ParserExtension.java source code

package org.apache.lucene.queryParser.ext;

/**
 * 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 org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Query;

/**
 * This class represents an extension base class to the Lucene standard
 * {@link QueryParser}. The {@link 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 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.
   * 
   * @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;

}

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene ParserExtension.java source code file:

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