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   *  to you under the Apache License, Version 2.0 (the
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  package org.apache.cayenne.exp.parser;
  
  import java.math.BigDecimal;
  
  import org.apache.cayenne.util.ConversionUtil;
  
  /**
   * @since 4.0
   */
  public abstract class EvaluatedMathNode extends EvaluatedNode {
      protected EvaluatedMathNode(int i) {
          super(i);
      }
  
      @Override
      protected int getRequiredChildrenCount() {
          return 1;
      }
  
      @Override
      protected Object evaluateSubNode(Object o, Object[] evaluatedChildren) throws Exception {
          BigDecimal result = ConversionUtil.toBigDecimal(o);
          if(result == null) {
              return null;
          }
          for (int i = 1; i < evaluatedChildren.length; i++) {
              BigDecimal value = ConversionUtil.toBigDecimal(evaluatedChildren[i]);
              if (value == null) {
                  return null;
              }
              result = op(result, value);
          }
  
          return result;
      }
  
      abstract protected BigDecimal op(BigDecimal result, BigDecimal arg);
  
  }
  