| 1 | /* Policy.java --- Policy Manager Class
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| 2 | Copyright (C) 1999 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is part of GNU Classpath.
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| 5 |
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| 6 | GNU Classpath is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | GNU Classpath is distributed in the hope that it will be useful, but
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| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with GNU Classpath; see the file COPYING. If not, write to the
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| 18 | Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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| 19 | 02111-1307 USA.
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| 20 |
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| 21 | Linking this library statically or dynamically with other modules is
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| 22 | making a combined work based on this library. Thus, the terms and
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| 23 | conditions of the GNU General Public License cover the whole
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| 24 | combination.
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| 25 |
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| 26 | As a special exception, the copyright holders of this library give you
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| 27 | permission to link this library with independent modules to produce an
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| 28 | executable, regardless of the license terms of these independent
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| 29 | modules, and to copy and distribute the resulting executable under
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| 30 | terms of your choice, provided that you also meet, for each linked
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| 31 | independent module, the terms and conditions of the license of that
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| 32 | module. An independent module is a module which is not derived from
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| 33 | or based on this library. If you modify this library, you may extend
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| 34 | this exception to your version of the library, but you are not
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| 35 | obligated to do so. If you do not wish to do so, delete this
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| 36 | exception statement from your version. */
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| 37 |
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| 38 | package java.security;
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| 39 |
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| 40 | /**
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| 41 | Policy is an abstract class for managing the system security
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| 42 | policy for the Java application environment. It specifies
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| 43 | which permissions are available for code from various
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| 44 | sources. The security policy is represented through a
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| 45 | subclass of Policy.
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| 46 |
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| 47 | Only one Policy is in effect at any time. ProtectionDomain
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| 48 | initializes itself with information from this class on the
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| 49 | set of permssions to grant.
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| 50 |
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| 51 | The location for the actual Policy could be anywhere in any
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| 52 | form because it depends on the Policy implementation. The
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| 53 | default system is in a flat ASCII file or it could be in a
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| 54 | database.
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| 55 |
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| 56 | The current installed Policy can be accessed with getPolicy
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| 57 | and changed with setPolicy if the code has the correct
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| 58 | permissions.
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| 59 |
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| 60 | The refresh method causes the Policy class to refresh/reload
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| 61 | its configuration. The method used to refresh depends on the
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| 62 | Policy implementation.
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| 63 |
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| 64 | When a protection domain initializes its permissions it uses
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| 65 | code like:
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| 66 | <code>
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| 67 | policy = Policy.getPolicy();
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| 68 | permissionCollection perms = policy.getPermissions(MyCodeSource)
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| 69 | </code>
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