package com.github.mygreen.supercsv.cellprocessor.conversion;
   
   import java.util.Optional;
   
   import org.supercsv.cellprocessor.ift.CellProcessor;
   import org.supercsv.cellprocessor.ift.StringCellProcessor;
   
   import com.github.mygreen.supercsv.annotation.conversion.CsvLeftPad;
   import com.github.mygreen.supercsv.builder.Configuration;
  import com.github.mygreen.supercsv.builder.FieldAccessor;
  import com.github.mygreen.supercsv.cellprocessor.ConversionProcessorFactory;
  import com.github.mygreen.supercsv.cellprocessor.format.TextFormatter;
  import com.github.mygreen.supercsv.exception.SuperCsvInvalidAnnotationException;
  import com.github.mygreen.supercsv.localization.MessageBuilder;
  
  /**
   * アノテーション {@link CsvLeftPad}をハンドリングして、{@link LeftPad}を作成します。
   * 
   * @since 2.0
   * @author T.TSUCHIE
   *
   */
  public class LeftPadFactory implements ConversionProcessorFactory<CsvLeftPad> {
      
      @Override
      public Optional<CellProcessor> create(final CsvLeftPad anno, final Optional<CellProcessor> next,
              final FieldAccessor field, final TextFormatter<?> formatter, final Configuration config) {
          
          if(anno.size() <= 0) {
              throw new SuperCsvInvalidAnnotationException(anno, MessageBuilder.create("anno.attr.min")
                      .var("property", field.getNameWithClass())
                      .varWithAnno("anno", anno.annotationType())
                      .var("attrName", "size")
                      .var("attrValue", anno.size())
                      .var("min", 1)
                      .format());
          }
          
          final LeftPadonversion/LeftPad.html#LeftPad">LeftPad processor = next.map(n -> new LeftPad(anno.size(), anno.padChar(), (StringCellProcessor)n))
                  .orElseGet(() -> new LeftPad(anno.size(), anno.padChar()));
          
          return Optional.of(processor);
      }
      
  }