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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   import org.apache.lucene.queryParser.core.processors.RemoveDeletedQueryNodesProcessor;
   22   
   23   /**
   24    * A {@link DeletedQueryNode} represents a node that was deleted from the query
   25    * node tree. It can be removed from the tree using the
   26    * {@link RemoveDeletedQueryNodesProcessor} processor.
   27    */
   28   public class DeletedQueryNode extends QueryNodeImpl {
   29   
   30     private static final long serialVersionUID = -9151675506000425293L;
   31   
   32     public DeletedQueryNode() {
   33       // empty constructor
   34     }
   35   
   36     public CharSequence toQueryString(EscapeQuerySyntax escaper) {
   37       return "[DELETEDCHILD]";
   38     }
   39   
   40     @Override
   41     public String toString() {
   42       return "<deleted/>";
   43     }
   44   
   45     @Override
   46     public QueryNode cloneTree() throws CloneNotSupportedException {
   47       DeletedQueryNode clone = (DeletedQueryNode) super.cloneTree();
   48   
   49       return clone;
   50   
   51     }
   52   
   53   }

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