content: package org.apache.solr.handler.component;
  
  import org.apache.lucene.queryparser.flexible.aqp.AqpQueryParser;
  import org.apache.lucene.queryparser.flexible.aqp.nodes.AqpANTLRNode;
  import org.apache.lucene.queryparser.flexible.core.QueryNodeParseException;
  import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode;
  import org.apache.lucene.queryparser.flexible.core.parser.SyntaxParser;
  import org.apache.solr.common.params.CommonParams;
  import org.apache.solr.common.params.SolrParams;
  import org.apache.solr.request.SolrQueryRequest;
  import org.apache.solr.response.SolrQueryResponse;
  import org.apache.solr.search.*;
  
  import java.io.IOException;
  
  /*
   * 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.
   */
  
  /**
   * Returns the JSON representation of the query syntax tree
   * useful for parsing query (providing feedback to the user;
   * used by UI Bumblebee)
   */
  public class AqpQueryTree extends SearchComponent {
  
      public static final String COMPONENT_NAME = "qtree";
  
      @Override
      public void prepare(ResponseBuilder rb) throws IOException {
          SolrQueryRequest req = rb.req;
          SolrParams params = req.getParams();
          if (!params.getBool(COMPONENT_NAME, true)) {
              return;
          }
          SolrQueryResponse rsp = rb.rsp;
  
  
          String defType = params.get(QueryParsing.DEFTYPE, QParserPlugin.DEFAULT_QTYPE);
  
          // get it from the response builder to give a different component a chance
          // to set it.
          String queryString = rb.getQueryString();
          if (queryString == null) {
              // this is the normal way it's set.
              queryString = params.get(CommonParams.Q);
          }
  
          QParser parser;
          try {
              parser = QParser.getParser(queryString, defType, req);
  
              if (parser instanceof AqpAdsabsQParser) {
                  AqpQueryParser aqpParser = ((AqpAdsabsQParser) parser).getParser();
                  SyntaxParser syntaxParser = aqpParser.getSyntaxParser();
                  QueryNode queryTree = syntaxParser.parse(queryString, null);
                  if (queryTree instanceof AqpANTLRNode) {
                      if (params.get(CommonParams.WT, null) == "xml") {
                          //System.err.println(((AqpANTLRNode) queryTree).toJson());
                          rsp.add("qtree", queryTree.toString());
                      } else {
                          //System.err.println(((AqpANTLRNode) queryTree).toString());
                          rsp.add("qtree", ((AqpANTLRNode) queryTree).toJson());
                      }
                  }
              }
  
          } catch (QueryNodeParseException e) {
              rsp.add("qtreeError", e.getMessage());
          } catch (SyntaxError e) {
              rsp.add("qtreeError", e.getMessage());
          }
  
  
      }
  
      @Override
      public void process(ResponseBuilder rb) throws IOException {
          // do nothing
      }
  
      @Override
      public String getDescription() {
          return null;
      }
  
  }
  