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package javax.security.auth.message.config;

import javax.security.auth.message.MessageInfo;

/**
 * This interface defines the common functionality implemented by
 * Authentication context configuration objects.
 *
 * @see ClientAuthContext
 * @see ServerAuthContext
 */
public interface AuthConfig {
    /**
     * Get the message layer name of this authentication context configuration 
     * object.
     *
     * @return The message layer name of this configuration object, or null if 
     * the configuration object pertains to an unspecified message layer.
     */
    String getMessageLayer();

    /**
     * Get the application context identifier of this authentication 
     * context configuration object.
     *
     * @return The String identifying the application context of this
     * configuration object, or null if the configuration object pertains
     * to an unspecified application context.
     */
    String getAppContext();

    /**
     * Get the authentication context identifier corresponding to the
     * request and response objects encapsulated in messageInfo.
     *
     * @param messageInfo A contextual Object that encapsulates the
     *          client request and server response objects.
     *
     * @return The authentication context identifier corresponding to the 
     *          encapsulated request and response objects, or null.
     *
     * @throws IllegalArgumentException If the type of the message
     * objects incorporated in messageInfo are not compatible with
     * the message types supported by this 
     * authentication context configuration object.
     */

    public String getAuthContextID(MessageInfo messageInfo);

    /**
     * Causes a dynamic authentication context configuration object to 
     * update the internal state that it uses to process calls to its
     * getAuthContext method.
     *
     * @exception SecurityException If the caller does not have permission
     *		to refresh the configuration object, or if an error occurred 
     *          during the update.
     */
    public void refresh();

    /**
     * Used to determine whether the authentication context configuration 
     * object encapsulates any protected authentication contexts.
     *
     * @return True if the configuration object encapsulates at least one
     *        protected authentication context. Otherwise, this method 
     *        returns false.
     */
    public boolean isProtected();
}