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Apache Solr (module: core)
There is a newer version: 9.7.0
/*
 * 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.solr.search;

import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.search.Query;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.request.SolrQueryRequest;

/**
 * Create a nested query, with the ability of that query to redefine its type via
 * local parameters.  This is useful in specifying defaults in configuration and
 * letting clients indirectly reference them.
 * 
Example: {!query defType=func v=$q1}
 * 
 if the q1 parameter is price then the query would be a function query on the price field.
 * 
 if the q1 parameter is {!lucene}inStock:true then a term query is
 *     created from the lucene syntax string that matches documents with inStock=true.
 */
public class NestedQParserPlugin extends QParserPlugin {
  public static final String NAME = "query";

  @Override
  public QParser createParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) {
    if (localParams == null) { // avoid an NPE later
      throw new SolrException(SolrException.ErrorCode.BAD_REQUEST,
          "the 'query' QParser must be invoked with local-params, e.g. {!query defType=...}");
    }
    return new QParser(qstr, localParams, params, req) {
      QParser baseParser;
      ValueSource vs;
      String b;

      @Override
      public Query parse() throws SyntaxError {
        baseParser = subQuery(localParams.get(QueryParsing.V), null);
        return baseParser.getQuery();
      }

      @Override
      public String[] getDefaultHighlightFields() {
        return baseParser.getDefaultHighlightFields();
      }

      @Override
      public Query getHighlightQuery() throws SyntaxError {
        return baseParser.getHighlightQuery();
      }

      @Override
      public void addDebugInfo(NamedList