package com.gh.mygreen.xlsmapper.cellconverter.impl;
   
   import java.math.BigDecimal;
   import java.math.BigInteger;
   import java.math.RoundingMode;
   
   import com.gh.mygreen.xlsmapper.Configuration;
   import com.gh.mygreen.xlsmapper.cellconverter.CellConverter;
   import com.gh.mygreen.xlsmapper.fieldaccessor.FieldAccessor;
  
  /**
   * {@link BigInteger}型を処理する{@link CellConverter}を作成するクラス。
   *
   * @since 2.0
   * @author T.TSUCHIE
   *
   */
  public class BigIntegerCellConverterFactory extends AbstractNumberCellConverterFactory<BigInteger> {
      
      @Override
      public BigIntegerCellConverter create(final FieldAccessor field, final Configuration config) {
          
          final BigIntegerCellConverter cellConverter = new BigIntegerCellConverter(field, config, this);
          setupCellConverter(cellConverter, field, config);
          
          return cellConverter;
          
      }
      
      @Override
      protected BigInteger convertTypeValue(final BigDecimal value) throws NumberFormatException, ArithmeticException {
          BigDecimal decimal = value.setScale(0, RoundingMode.HALF_UP);
          return decimal.toBigIntegerExact();
      }
      
      public class BigIntegerCellConverter extends AbstractNumberCellConverter<BigInteger> {
          
          private final BigIntegerCellConverterFactory convererFactory;
          
          private BigIntegerCellConverter(final FieldAccessor field, final Configuration config,
                  final BigIntegerCellConverterFactory convererFactory) {
              
              super(field, config);
              this.convererFactory = convererFactory;
          }
          
          @Override
          protected BigInteger convertTypeValue(final BigDecimal value) {
              return convererFactory.convertTypeValue(value);
          }
          
      }
      
  }