content: package org.apache.lucene.queryparser.flexible.aqp.nodes;
  
  /**
   * 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.nodes.ModifierQueryNode;
  import org.apache.lucene.queryparser.flexible.core.nodes.ModifierQueryNode.Modifier;
  import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode;
  
  import java.util.List;
  
  /**
   * A {@link AqpNotQueryNode} represents an NOT boolean operation performed on a
   * list of nodes.
   *
   * <p>
   *
   * The first node is set to be required
   * {ModifierQueryNode.Modifier#MOD_REQ} and the rest of the clauses will
   * have a {ModifierQueryNode.Modifier#MOD_NOT}
   *
   * @see AqpBooleanQueryNode
   */
  public class AqpNotQueryNode extends AqpBooleanQueryNode {
  
      private static final long serialVersionUID = 4054514488434283069L;
  
      /**
       * @param clauses
       *          - the query nodes to be and'ed
       */
      public AqpNotQueryNode(List<QueryNode> clauses) {
          super(clauses);
  
          operator = "NOT";
  
          if ((clauses == null) || (clauses.size() < 2)) {
              throw new IllegalArgumentException(
                      "NOT query must have at least two clauses");
          }
  
          QueryNode firstNode = clauses.get(0);
          applyModifier(clauses, Modifier.MOD_NOT);
          // reset the first node (if it was wrapped, ie not already having user
          // specified MODIFIER)
          if (!firstNode.equals(clauses.get(0))) {
              clauses
                      .set(
                              0,
                              new ModifierQueryNode(((ModifierQueryNode) clauses.get(0))
                                      .getChild(), Modifier.MOD_REQ));
          }
  
          set(clauses);
  
      }
  
  }
  