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/* Authenticator.java --

   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

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this exception to your version of the library, but you are not

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exception statement from your version. */

package gnu.java.net.protocol.http;

/**

 * Callback interface for managing authentication.

 * @see Request#setAuthenticator

 *

 * @author Chris Burdess (dog@gnu.org)

 */

public interface Authenticator

{

  /**

   * Returns the credentials to supply for the given realm.

   * @param realm the authentication realm

   * @param attempt zero on first authentication attempt, increments on each

   * unsuccessful attempt

   */

  Credentials getCredentials(String realm, int attempt);

}