/*
 * Jakarta Bean Validation API
 *
 * License: Apache License, Version 2.0
 * See the license.txt file in the root directory or <http://www.apache.org/licenses/LICENSE-2.0>.
 */
package jakarta.validation.constraints;

import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.CONSTRUCTOR;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.ElementType.TYPE_USE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Documented;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import jakarta.validation.Constraint;
import jakarta.validation.Payload;
import jakarta.validation.constraints.Email.List;

/**
 * The string has to be a well-formed email address. Exact semantics of what makes up a valid
 * email address are left to Jakarta Bean Validation providers. Accepts {@code CharSequence}.
 * <p>
 * {@code null} elements are considered valid.
 *
 * @author Emmanuel Bernard
 * @author Hardy Ferentschik
 *
 * @since 2.0
 */
@Documented
@Constraint(validatedBy = { })
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
@Retention(RUNTIME)
@Repeatable(List.class)
public @interface Email {

	String message() default "{jakarta.validation.constraints.Email.message}";

	Class<?>[] groups() default { };

	Class<? extends Payload>[] payload() default { };

	/**
	 * @return an additional regular expression the annotated element must match. The default
	 * is any string ('.*')
	 */
	String regexp() default ".*";

	/**
	 * @return used in combination with {@link #regexp()} in order to specify a regular
	 * expression option
	 */
	Pattern.Flag[] flags() default { };

	/**
	 * Defines several {@code @Email} constraints on the same element.
	 *
	 * @see Email
	 */
	@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
	@Retention(RUNTIME)
	@Documented
	public @interface List {
		Email[] value();
	}
}
