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    1   package org.apache.lucene.queryParser.core.nodes;
    2   
    3   /**
    4    * Licensed to the Apache Software Foundation (ASF) under one or more
    5    * contributor license agreements.  See the NOTICE file distributed with
    6    * this work for additional information regarding copyright ownership.
    7    * The ASF licenses this file to You under the Apache License, Version 2.0
    8    * (the "License"); you may not use this file except in compliance with
    9    * the License.  You may obtain a copy of the License at
   10    *
   11    *     http://www.apache.org/licenses/LICENSE-2.0
   12    *
   13    * Unless required by applicable law or agreed to in writing, software
   14    * distributed under the License is distributed on an "AS IS" BASIS,
   15    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   16    * See the License for the specific language governing permissions and
   17    * limitations under the License.
   18    */
   19   
   20   import org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax;
   21   
   22   /**
   23    * A {@link NoTokenFoundQueryNode} is used if a term is convert into no tokens
   24    * by the tokenizer/lemmatizer/analyzer (null).
   25    */
   26   public class NoTokenFoundQueryNode extends DeletedQueryNode {
   27   
   28     private static final long serialVersionUID = 7332975497586993833L;
   29   
   30     public NoTokenFoundQueryNode() {
   31       super();
   32     }
   33   
   34     @Override
   35     public CharSequence toQueryString(EscapeQuerySyntax escaper) {
   36       return "[NTF]";
   37     }
   38   
   39     @Override
   40     public String toString() {
   41       return "<notokenfound/>";
   42     }
   43   
   44     @Override
   45     public QueryNode cloneTree() throws CloneNotSupportedException {
   46       NoTokenFoundQueryNode clone = (NoTokenFoundQueryNode) super.cloneTree();
   47   
   48       // nothing to do here
   49   
   50       return clone;
   51     }
   52   }

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