package com.github.mygreen.supercsv.cellprocessor.constraint;
   
   import java.util.Arrays;
   import java.util.List;
   import java.util.Optional;
   import java.util.stream.Collectors;
   
   import org.supercsv.cellprocessor.ift.CellProcessor;
   
  import com.github.mygreen.supercsv.annotation.constraint.CsvLengthExact;
  import com.github.mygreen.supercsv.builder.Configuration;
  import com.github.mygreen.supercsv.builder.FieldAccessor;
  import com.github.mygreen.supercsv.cellprocessor.ConstraintProcessorFactory;
  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 CsvLengthExact}をハンドリングして、CellProcessorの{@link LengthExact}を作成する。
   *
   * @since 2.0
   * @author T.TSUCHIE
   *
   */
  public class LengthExactFactory implements ConstraintProcessorFactory<CsvLengthExact> {
      
      @Override
      public Optional<CellProcessor> create(final CsvLengthExact anno, final Optional<CellProcessor> next,
              final FieldAccessor field, final TextFormatter<?> formatter, final Configuration config) {
          
          final List<Integer> requriedLength = Arrays.stream(anno.value())
                  .filter(l -> l >= 0)
                  .sorted()
                  .distinct()
                  .boxed()
                  .collect(Collectors.toList());
          
          if(requriedLength.isEmpty()) {
              throw new SuperCsvInvalidAnnotationException(anno, MessageBuilder.create("anno.attr.required")
                      .var("property", field.getNameWithClass())
                      .varWithAnno("anno", anno.annotationType())
                      .var("attrName", "value")
                      .format());
          }
          
          final LengthExactraint/LengthExact.html#LengthExact">LengthExact processor = next.map(n -> new LengthExact(requriedLength, n))
                  .orElseGet(() -> new LengthExact(requriedLength));
          processor.setValidationMessage(anno.message());
          
          return Optional.of(processor);
      }
      
  }