content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *  
   *      http://www.apache.org/licenses/LICENSE-2.0
   *  
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /**
   * (created at 2011-1-20)
   */
  package com.alibaba.cobar.parser.ast.expression.arithmeic;
  
  import java.math.BigDecimal;
  import java.math.BigInteger;
  
  import com.alibaba.cobar.parser.ast.expression.Expression;
  import com.alibaba.cobar.parser.visitor.SQLASTVisitor;
  
  /**
   * <code>higherExpr ('MOD'|'%') higherExpr</code>
   * 
   * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
   */
  public class ArithmeticModExpression extends ArithmeticBinaryOperatorExpression {
      public ArithmeticModExpression(Expression leftOprand, Expression rightOprand) {
          super(leftOprand, rightOprand, PRECEDENCE_ARITHMETIC_FACTOR_OP);
      }
  
      @Override
      public String getOperator() {
          return "%";
      }
  
      @Override
      public void accept(SQLASTVisitor visitor) {
          visitor.visit(this);
      }
  
      @Override
      public Number calculate(Integer integer1, Integer integer2) {
          if (integer1 == null || integer2 == null)
              return null;
          int i1 = integer1.intValue();
          int i2 = integer2.intValue();
          if (i2 == 0)
              return null;
          return i1 % i2;
      }
  
      @Override
      public Number calculate(Long long1, Long long2) {
          if (long1 == null || long2 == null)
              return null;
          int i1 = long1.intValue();
          int i2 = long2.intValue();
          if (i2 == 0)
              return null;
          return i1 % i2;
      }
  
      @Override
      public Number calculate(BigInteger bigint1, BigInteger bigint2) {
          if (bigint1 == null || bigint2 == null)
              return null;
          int comp = bigint2.compareTo(BigInteger.ZERO);
          if (comp == 0) {
              return null;
          } else if (comp < 0) {
              return bigint1.negate().mod(bigint2).negate();
          } else {
              return bigint1.mod(bigint2);
          }
      }
  
      @Override
      public Number calculate(BigDecimal bigDecimal1, BigDecimal bigDecimal2) {
          throw new UnsupportedOperationException();
      }
  }
  