Source for gnu.javax.sound.AudioSecurityManager

   1: /* AudioSecurityManager.java -- Manages Security requests for Sound classes.
   2: 
   3:  Copyright (C) 2007 Free Software Foundation, Inc.
   4: 
   5: This file is part of GNU Classpath.
   6: 
   7: GNU Classpath is free software; you can redistribute it and/or modify
   8: it under the terms of the GNU General Public License as published by
   9: the Free Software Foundation; either version 2, or (at your option)
  10: any later version.
  11: 
  12: GNU Classpath is distributed in the hope that it will be useful, but
  13: WITHOUT ANY WARRANTY; without even the implied warranty of
  14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15: General Public License for more details.
  16: 
  17: You should have received a copy of the GNU General Public License
  18: along with GNU Classpath; see the file COPYING.  If not, write to the
  19: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20: 02110-1301 USA.
  21: 
  22: Linking this library statically or dynamically with other modules is
  23: making a combined work based on this library.  Thus, the terms and
  24: conditions of the GNU General Public License cover the whole
  25: combination.
  26: 
  27: As a special exception, the copyright holders of this library give you
  28: permission to link this library with independent modules to produce an
  29: executable, regardless of the license terms of these independent
  30: modules, and to copy and distribute the resulting executable under
  31: terms of your choice, provided that you also meet, for each linked
  32: independent module, the terms and conditions of the license of that
  33: module.  An independent module is a module which is not derived from
  34: or based on this library.  If you modify this library, you may extend
  35: this exception to your version of the library, but you are not
  36: obligated to do so.  If you do not wish to do so, delete this
  37: exception statement from your version. */
  38: 
  39: package gnu.javax.sound;
  40: 
  41: import javax.sound.sampled.AudioPermission;
  42: 
  43: /**
  44:  * This class handles security requests for classes in the Sound API.
  45:  *
  46:  * A class that needs to check against a particular permission type may use this
  47:  * class to query the <code>SecurityManager</code>.
  48:  *
  49:  * For example, to check for a read permission, a class can simply pass the
  50:  * <code>Permission.READ</code> constant to
  51:  * {@link #checkPermissions(gnu.javax.sound.AudioSecurityManager.Permission))},
  52:  * like the following code demonstrates:
  53:  *
  54:  * <pre>
  55:  * AudioSecurityManager.checkPermissions(Permission.PLAY);
  56:  * </pre>
  57:  *
  58:  * If there is need to query for all the defined permissions type, the constant
  59:  * <code>Permission.ALL</code> can be used. In alternative, the
  60:  * {@link #checkPermissions()} is presented as a shorthand.
  61:  *
  62:  * @author Mario Torre <neugens@limasoftware.net>
  63:  */
  64: public class AudioSecurityManager
  65: {
  66:   /**
  67:    * Defines a common set of permission allowed by the specification.
  68:    */
  69:   public static enum Permission
  70:   {
  71:     PLAY, RECORD, ALL
  72:   }
  73: 
  74:   /**
  75:    * Shorthand to <code>checkPermissions(Permission.ALL)</code>.
  76:    */
  77:   public static final void checkPermissions()
  78:   {
  79:     checkPermissions(Permission.ALL);
  80:   }
  81: 
  82:   /**
  83:    * Query the <code>SecurityManager</code> agains the given
  84:    * <code>Permission</code>.
  85:    *
  86:    * @param permission
  87:    */
  88:   public static final void checkPermissions(Permission permission)
  89:   {
  90:     SecurityManager sm = System.getSecurityManager();
  91:     if (sm != null)
  92:       {
  93:         String perm = null;
  94:         switch (permission)
  95:           {
  96:           case PLAY:
  97:             perm = "play";
  98:             break;
  99: 
 100:           case RECORD:
 101:             perm = "record";
 102:             break;
 103: 
 104:           case ALL: default:
 105:             perm = "*";
 106:             break;
 107:           }
 108: 
 109:         sm.checkPermission(new AudioPermission(perm));
 110:       }
 111:   }
 112: }