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+/* LoginModule.java -- interface for login implementations.
+   Copyright (C) 2004  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.security.auth.spi;
+
+import java.util.Map;
+
+import javax.security.auth.Subject;
+import javax.security.auth.callback.CallbackHandler;
+import javax.security.auth.login.LoginException;
+
+/**
+ * The base interface for login methods in the Java Authentication and
+ * Authorization Service (JAAS).
+ *
+ * <p>This interface is used by service providers that implement login
+ * services, and is used internally by the JAAS system. It is not useful
+ * to application programmers, who should use the {@link
+ * javax.security.auth.login.LoginContext} instead.
+ *
+ * @author Casey Marshall (csm@gnu.org)
+ */
+public interface LoginModule
+{
+  /**
+   * Abort the current login attempt. This is called after {@link #login()}
+   * if the overall login attempt fails (that is, if one of the other login
+   * modules that is REQUIRED or REQUISITE fails). This method should clean
+   * up this module's saved state, if any.
+   *
+   * @return True if the abort succeeded, or false if this module should
+   * be ignored.
+   * @throws LoginException If the abort fails.
+   */
+  boolean abort() throws LoginException;
+
+  /**
+   * Commit the current login attempt. This is called after {@link
+   * #login()} if the overall login attempt succeeds (that is, all
+   * methods have satisfied all REQUIRED, REQUISITE, SUFFICIENT and
+   * OPTIONAL module requirements).
+   *
+   * @return True if the commit succeeded, or false if this module
+   * should be ignored.
+   * @throws LoginException If the commit fails.
+   */
+  boolean commit() throws LoginException;
+
+  /**
+   * Initializes this login module. This method is called when the
+   * instance implementing this interface is instantiated, and should
+   * perform any initialization based on the given parameters.
+   * Implementations should ignore state variables and options they do
+   * not recognize.
+   *
+   * @param subject The subject being authenticated.
+   * @param handler The callback handler for user input.
+   * @param sharedState A mapping that is shared between all login
+   * modules.
+   * @param options A mapping of options given to this module.
+   */
+  void initialize(Subject subject, CallbackHandler handler,
+                  Map<String, ?> sharedState, Map<String, ?> options);
+
+  /**
+   * Authenticates a subject to the system. This is the primary
+   * mechanism by which subjects are authenticated, and typically
+   * implementations will ask for credentials (for example, a user
+   * name and password) which will then be verified.
+   *
+   * @return True if the subject was authenticated, or false if this
+   * module should be ignored.
+   * @throws LoginException If this method fails.
+   */
+  boolean login() throws LoginException;
+
+  /**
+   * Logs a subject out. This is primarily used for modules that must
+   * destroy or remove the authentication state associated with a
+   * logged-in subject.
+   *
+   * @return True if the logout succeeds, or false if this module
+   * should be ignored.
+   * @throws LoginException If this method fails.
+   */
+  boolean logout() throws LoginException;
+}