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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 java.util.function.Function;
  
  import org.apache.cayenne.exp.Expression;
  
  /**
   * "Not In" expression.
   * 
   */
  public class ASTNotIn extends ConditionNode {
      ASTNotIn(int id) {
          super(id);
      }
  
      public ASTNotIn() {
          super(ExpressionParserTreeConstants.JJTNOTIN);
      }
  
      public ASTNotIn(SimpleNode path, SimpleNode node) {
          super(ExpressionParserTreeConstants.JJTNOTIN);
          jjtAddChild(path, 0);
          jjtAddChild(node, 1);
          connectChildren();
      }
  
      @Override
      protected int getRequiredChildrenCount() {
          return 2;
      }
  
      @Override
      protected Boolean evaluateSubNode(Object o, Object[] evaluatedChildren) throws Exception {
          if (o == null || evaluatedChildren[1] == null) {
              return Boolean.FALSE;
          }
  
          Object[] objects = (Object[]) evaluatedChildren[1];
          for (Object object : objects) {
              if (object != null && Evaluator.evaluator(o).eq(o, object)) {
                  return Boolean.FALSE;
              }
          }
  
          return Boolean.TRUE;
      }
  
      /**
       * Creates a copy of this expression node, without copying children.
       */
      @Override
      public Expression shallowCopy() {
          return new ASTNotIn(id);
      }
  
      @Override
      protected String getExpressionOperator(int index) {
          return "not in";
      }
  
      @Override
      public int getType() {
          return Expression.NOT_IN;
      }
      
      @Override
      protected Object transformExpression(Function<Object, Object> transformer) {
          Object transformed = super.transformExpression(transformer);
          
          // transform empty ASTNotIn to ASTTrue
          if (transformed instanceof ASTNotIn) {
              ASTNotIn exp = (ASTNotIn) transformed;
              if (exp.jjtGetNumChildren() == 2) {
                  Node child = exp.jjtGetChild(1);
                  if(child instanceof ASTList) {
                      ASTList list = (ASTList) child;
                      Object[] objects = (Object[]) list.evaluate(null);
                      if (objects.length == 0) {
                          transformed = new ASTTrue();
                      }
                  }
              }
          }
  
          return transformed;
      }
  
  }
  