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//   http://www.apache.org/licenses/LICENSE-2.0
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package org.openqa.selenium.support;

import org.openqa.selenium.By;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Field;

/**
 * Used to mark a field on a Page Object to indicate an alternative mechanism for locating the
 * element or a list of elements. Used in conjunction with
 * {@link org.openqa.selenium.support.PageFactory}
 * this allows users to quickly and easily create PageObjects.
 *
 * It can be used on a types as well, but will not be processed by default.
 *
 * 
 * You can either use this annotation by specifying both "how" and "using" or by specifying one of
 * the location strategies (eg: "id") with an appropriate value to use. Both options will delegate
 * down to the matching {@link org.openqa.selenium.By} methods in By class.
 *
 * For example, these two annotations point to the same element:
 *
 *  * @FindBy(id = "foobar") WebElement foobar;
 * @FindBy(how = How.ID, using = "foobar") WebElement foobar;
 * 
 *
 * and these two annotations point to the same list of elements:
 *
 *  * @FindBy(tagName = "a") List<WebElement> links;
 * @FindBy(how = How.TAG_NAME, using = "a") List<WebElement> links;
 * 
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.TYPE})
@PageFactoryFinder(FindBy.FindByBuilder.class)
public @interface FindBy {
  How how() default How.UNSET;

  String using() default "";

  String id() default "";

  String name() default "";

  String className() default "";

  String css() default "";

  String tagName() default "";

  String linkText() default "";

  String partialLinkText() default "";

  String xpath() default "";

  class FindByBuilder extends AbstractFindByBuilder {
    @Override
    public By buildIt(Object annotation, Field field) {
      FindBy findBy = (FindBy) annotation;
      assertValidFindBy(findBy);

      By ans = buildByFromShortFindBy(findBy);
      if (ans == null) {
        ans = buildByFromLongFindBy(findBy);
      }

      return ans;

    }

  }

}