content: package org.apache.lucene.queryparser.flexible.aqp.builders;
  
  /**
   * 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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.flexible.core.QueryNodeException;
  import org.apache.lucene.queryparser.flexible.core.builders.QueryBuilder;
  import org.apache.lucene.queryparser.flexible.core.builders.QueryTreeBuilder;
  import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode;
  import org.apache.lucene.queryparser.flexible.standard.builders.StandardQueryBuilder;
  import org.apache.lucene.queryparser.flexible.standard.processors.StandardQueryNodeProcessorPipeline;
  import org.apache.lucene.search.Query;
  
  /**
   * This query tree builder only defines the necessary methods for
   * debugging. 
   *
   * @see QueryTreeBuilder
   * @see StandardQueryNodeProcessorPipeline
   */
  public class AqpQueryTreeBuilder extends QueryTreeBuilder implements
          StandardQueryBuilder {
  
      public final static String SYNONYMS = "Treat_as_synonyms";
  
      private boolean debug = false;
      private int counter = 0;
  
      public AqpQueryTreeBuilder(boolean debug) {
          this.setDebug(debug);
          init();
      }
  
      public AqpQueryTreeBuilder() {
          init();
      }
  
      public void setDebug(boolean val) {
          if (val != debug) {
              debug = val;
              init();
          }
          debug = val;
      }
  
      public boolean isInDebugMode() {
          return debug;
      }
  
      public void init() {
          throw new IllegalAccessError("AqpQueryTreeBuilder must be subclassed and has the init() method");
      }
  
      @Override
      public Query build(QueryNode queryNode) throws QueryNodeException {
          this.counter = 0;
          return (Query) super.build(queryNode);
      }
  
  
      public void setBuilder(Class<? extends QueryNode> queryNodeClass,
                             QueryBuilder builder) {
          if (this.debug) {
              super.setBuilder(queryNodeClass, new DebuggingNodeBuilder(queryNodeClass,
                      builder));
          } else {
              super.setBuilder(queryNodeClass, builder);
          }
      }
  
      class DebuggingNodeBuilder implements QueryBuilder {
          private Class<? extends QueryNode> clazz = null;
          private QueryBuilder realBuilder = null;
  
          DebuggingNodeBuilder(Class<? extends QueryNode> queryNodeClass,
                               QueryBuilder builder) {
              clazz = queryNodeClass;
              realBuilder = builder;
          }
  
          public Object build(QueryNode queryNode) throws QueryNodeException {
              System.out.println("--------------------------------------------");
              System.out.println("step     " + counter++ + ".");
              System.out.println("builder: " + realBuilder.getClass().getName());
              System.out.println("node:    " + clazz.getName());
              System.out.println(queryNode.toString());
              System.out.println("   -->");
              Object result = realBuilder.build(queryNode);
              if (result != null) {
                  System.out.println(result + "  <"
                          + result.getClass().getName() + ">");
              } else {
                  System.out.println("null");
              }
              System.out.println("--------------------------------------------");
              return result;
          }
  
      }
  
  }
  