package com.opencsv.bean.processor;
   
   /**
    * StringProcessor that converts the empty or blank strings to a desired value string.
    * This is useful when you want a default value.
    * <p>
    * A sample of this can be found in the unit test ProcessorTestBean and is annotated as follows.
    * <p>
    * <pre>
   *     &#64;PreAssignmentProcessor(processor = ConvertEmptyOrBlankStringsToDefault.class, paramString = "-1")
   *     &#64;CsvBindByName(column = "id")
   *     private int beanId;
   * </pre>
   *
   * @author Scott Conway
   * @since 5.4
   */
  public class ConvertEmptyOrBlankStringsToDefault implements StringProcessor {
      String defaultValue;
  
      /**
       * Default constructor
       */
      public ConvertEmptyOrBlankStringsToDefault() {
      }
  
      @Override
      public String processString(String value) {
          if (value == null || value.trim().isEmpty()) {
              return defaultValue;
          }
          return value;
      }
  
      @Override
      public void setParameterString(String value) {
          defaultValue = value;
      }
  }