package com.github.mygreen.supercsv.cellprocessor.constraint;
   
   import java.util.Optional;
   import java.util.regex.PatternSyntaxException;
   
   import org.supercsv.cellprocessor.ift.CellProcessor;
   import org.supercsv.cellprocessor.ift.StringCellProcessor;
   
   import com.github.mygreen.supercsv.annotation.constraint.CsvPattern;
  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;
  import com.github.mygreen.supercsv.util.Utils;
  
  /**
   * アノテーション{@link CsvPattern}をハンドリングして、CellProcessorの{@link Pattern}を作成する。
   *
   * @since 2.0
   * @author T.TSUCHIE
   *
   */
  public class PatternFactory implements ConstraintProcessorFactory<CsvPattern> {
      
      @Override
      public Optional<CellProcessor> create(final CsvPattern anno, final Optional<CellProcessor> next,
              final FieldAccessor field, final TextFormatter<?> formatter, final Configuration config) {
          
          final int flags = Utils.buildRegexFlags(anno.flags());
          final java.util.regex.Pattern pattern;
          try {
              pattern = java.util.regex.Pattern.compile(anno.regex(), flags);
              
          } catch(PatternSyntaxException e) {
              throw new SuperCsvInvalidAnnotationException(anno, MessageBuilder.create("anno.attr.invalidType")
                      .var("property", field.getNameWithClass())
                      .varWithAnno("anno", anno.annotationType())
                      .var("attrName", "regex")
                      .var("attrValue", anno.regex())
                      .var("type", "{key.regex}")
                      .format(true));
          }
          
          final Patternonstraint/Pattern.html#Pattern">Pattern processor = next.map(n -> new Pattern(pattern, anno.description(), (StringCellProcessor)n))
                  .orElseGet(() -> new Pattern(pattern, anno.description()));
          
          processor.setValidationMessage(anno.message());
          
          return Optional.of(processor);
      }
      
  }