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package javax.servlet.annotation;


import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * This annotation is used on a Servlet implementation class to specify security
 * constraints to be enforced by a Servlet container on HTTP protocol messages.
 * The Servlet container will enforce these constraints on the url-patterns
 * mapped to the servlets mapped to the annotated class.
 *
 * @since Servlet 3.0
 */

@Inherited
@Documented
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface ServletSecurity {

    /**
     * Defines the access semantic to be applied to an empty rolesAllowed array.
     */
    enum EmptyRoleSemantic {
        /**
         * access is to be permitted independent of authentication state and
         * identity.
         */
        PERMIT,
        /**
         * access is to be denied independent of authentication state and
         * identity.
         */
        DENY
    }

    /**
     * Defines the data protection requirements that must be satisfied by
     * the transport
     */
    enum TransportGuarantee {
        /**
         * no protection of user data must be performed by the transport.
         */
        NONE,
        /**
         * All user data must be encrypted by the transport (typically
         * using SSL/TLS).
         */
        CONFIDENTIAL
    }

    /**
     * Get the {@link HttpConstraint} that defines the protection
     * that is to be applied to all HTTP methods that are NOT represented in
     * the array returned by httpMethodConstraints.
     *
     * @return a HttpConstraint object.
     */
    HttpConstraint value() default @HttpConstraint;

    /**
     * Get the HTTP method specific constraints. Each
     * {@link HttpMethodConstraint} names an HTTP protocol method
     * and defines the protection to be applied to it.
     *
     * @return an array of {@link HttpMethodConstraint} elements each
     * defining the protection to be applied to one HTTP protocol method. For
     * any HTTP method name, there must be at most one corresponding element in
     * the returned array. If the returned array is of zero length, it indicates
     * that no HTTP method specific constraints are defined.
     */

  
    HttpMethodConstraint[] httpMethodConstraints() default {};
}