public enum GoodsPromoteEnum {

  /**
   * 0 精品
   */
  fine("精品",0),
  /**
   * 1 限时购
   */
  limit("限时购",1), 
  /**
   * 2 特价
   */
  cheap("特价",2);
  
  private String value;

  private int index;

  private GoodsPromoteEnum(String value, int index) {
    this.value = value;
    this.index = index;
  }
  
  public static GoodsPromoteEnum get(String value){
    for (GoodsPromoteEnum p : GoodsPromoteEnum.values()) {
      if (p.getValue().equals(value)) {
        return p;
      }
    }
    return null;
  }
  
  public static GoodsPromoteEnum get(int index){
    for (GoodsPromoteEnum p : GoodsPromoteEnum.values()) {
      if (p.getIndex() == index) {
        return p;
      }
    }
    return null;
  }

  public String getValue() {
    return value;
  }

  public void setValue(String value) {
    this.value = value;
  }

  public int getIndex() {
    return index;
  }

  public void setIndex(int index) {
    this.index = index;
  }
}

public class StringToGoodsConverter implements Converter {

  @Override
  public GoodsPromoteEnum convert(String value) {
    if (StringUtils.isBlank(value)) {
     return null;
    }
    return GoodsPromoteEnum.get(value);
  }

}