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   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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  package org.apache.cayenne.exp.parser;
  
  import org.apache.cayenne.exp.Expression;
  import org.apache.cayenne.exp.ExpressionFactory;
  
  /**
   * @since 4.2
   */
  public class ASTExists extends ConditionNode {
  
      public ASTExists(Expression expression) {
          super(0);
          jjtAddChild((SimpleNode)expression, 0);
      }
  
      ASTExists(int id) {
          super(id);
      }
  
      @Override
      protected int getRequiredChildrenCount() {
          return 1;
      }
  
      @Override
      protected Boolean evaluateSubNode(Object o, Object[] evaluatedChildren) throws Exception {
          return null;
      }
  
      @Override
      protected String getExpressionOperator(int index) {
          return null;
      }
  
      @Override
      protected boolean isValidParent(Node n) {
          return true;
      }
  
      @Override
      public void jjtSetParent(Node n) {
          super.jjtSetParent(n);
      }
  
      @Override
      public void jjtAddChild(Node n, int i) {
          super.jjtAddChild(n, i);
      }
  
      @Override
      public Expression shallowCopy() {
          return new ASTExists(id);
      }
  
      @Override
      public int getType() {
          return Expression.EXISTS;
      }
  
      /**
       * @inheritDoc
       * @since 5.0
       */
      @Override
      public Expression exists() {
          return this;
      }
  
      /**
       * @inheritDoc
       * @since 5.0
       */
      @Override
      public Expression notExists() {
          return ExpressionFactory.notExists((Expression) getOperand(0));
      }
  }
  