package com.github.mygreen.supercsv.cellprocessor.conversion;
   
   import org.supercsv.cellprocessor.CellProcessorAdaptor;
   import org.supercsv.cellprocessor.ift.StringCellProcessor;
   import org.supercsv.util.CsvContext;
   
   
   /**
    * 文字列をトリムするCellProcessor。
   * <p>値がNullの時も処理を続行する</p>
   * 
   * @since 1.0.2
   * @author T.TSUCHIE
   *
   */
  public class Trim extends CellProcessorAdaptor implements StringCellProcessor {
      
      /**
       * Constructs a new <tt>Trim</tt> processor, which trims a String to ensure it has no surrounding whitespace.
       */
      public Trim() {
          super();
      }
      
      /**
       * Constructs a new <tt>Trim</tt> processor, which trims a String to ensure it has no surrounding whitespace then
       * calls the next processor in the chain.
       * 
       * @param next the next processor in the chain
       * @throws NullPointerException {@literal if next is null}
       */
      public Trim(final StringCellProcessor next) {
          super(next);
      }
      
      @SuppressWarnings("unchecked")
      public Object execute(final Object value, final CsvContext context) {
          
          if(value == null) {
              return next.execute(value, context);
          }
          
          final String result = value.toString().trim();
          return next.execute(result, context);
      }
      
  }