package com.atlassian.webdriver.waiter.webdriver.function.field;
   
   import com.atlassian.webdriver.waiter.webdriver.retriever.WebElementFieldRetriever;
   import com.atlassian.webdriver.waiter.webdriver.function.ConditionFunction;
   import org.openqa.selenium.WebDriver;
   
   /**
    * @since 2.1.0
    */
  public class IsEmptyFunction implements ConditionFunction
  {
      private final WebElementFieldRetriever fieldRetriever;
  
      public IsEmptyFunction(WebElementFieldRetriever fieldRetriever)
      {
          this.fieldRetriever = fieldRetriever;
      }
  
      public Boolean apply(WebDriver from)
      {
          String fieldValue = fieldRetriever.retrieveField();
          return fieldValue == null || "".equals(fieldValue);
      }
  }