package com.atlassian.sal.api.user;
   
   import javax.annotation.Nullable;
   import javax.xml.bind.annotation.adapters.XmlAdapter;
   
   import static org.apache.commons.lang.StringUtils.isNotBlank;
   
   /**
    * A JAXB {@link XmlAdapter} which converts to and from {@link UserKey} objects.
   * @since 2.10.4
   */
  public class UserKeyXmlAdapter extends XmlAdapter<String, UserKey>
  {
      @Override
      @Nullable
      public UserKey unmarshal(String stringValue)
      {
          if (isNotBlank(stringValue))
          {
              return new UserKey(stringValue);
          }
          else
          {
              return null;
          }
      }
  
      @Override
      @Nullable
      public String marshal(UserKey userKey)
      {
          if (userKey != null)
          {
              return userKey.getStringValue();
          }
          else
          {
              return null;
          }
      }
  }