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   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *    https://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cayenne.exp.parser;
  
  import java.math.BigDecimal;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Iterator;
  
  import org.apache.cayenne.exp.Expression;
  
  /**
   * "Subtract" expression.
   * 
   * @since 1.1
   */
  public class ASTSubtract extends EvaluatedMathNode {
      ASTSubtract(int id) {
          super(id);
      }
  
      public ASTSubtract() {
          super(ExpressionParserTreeConstants.JJTSUBTRACT);
      }
  
      public ASTSubtract(Object... nodes) {
          this(Arrays.asList(nodes));
      }
  
      public ASTSubtract(Collection<?> nodes) {
          super(ExpressionParserTreeConstants.JJTSUBTRACT);
          int len = nodes.size();
          Iterator<?> it = nodes.iterator();
          for (int i = 0; i < len; i++) {
              jjtAddChild(wrapChild(it.next()), i);
          }
          connectChildren();
      }
  
      @Override
      protected BigDecimal op(BigDecimal result, BigDecimal arg) {
          return result.subtract(arg);
      }
  
      /**
       * Creates a copy of this expression node, without copying children.
       */
      @Override
      public Expression shallowCopy() {
          return new ASTSubtract(id);
      }
  
      @Override
      protected String getExpressionOperator(int index) {
          return "-";
      }
  
      @Override
      public int getType() {
          return Expression.SUBTRACT;
      }
  
      @Override
      public void jjtClose() {
          super.jjtClose();
          flattenTree();
      }
  }
  