Source for gnu.java.security.action.GetPropertyAction

   1: /* GetPropertyAction.java
   2:    Copyright (C) 2004 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: package gnu.java.security.action;
  39: 
  40: import java.security.PrivilegedAction;
  41: 
  42: /**
  43:  * PrivilegedAction implementation that calls System.getProperty() with
  44:  * the property name passed to its constructor.
  45:  *
  46:  * Example of use:
  47:  * <code>
  48:  * GetPropertyAction action = new GetPropertyAction("http.proxyPort");
  49:  * String port = AccessController.doPrivileged(action);
  50:  * </code>
  51:  */
  52: public class GetPropertyAction implements PrivilegedAction<String>
  53: {
  54:   String name;
  55:   String value = null;
  56: 
  57:   public GetPropertyAction()
  58:   {
  59:   }
  60: 
  61:   public GetPropertyAction(String propName)
  62:   {
  63:     setParameters(propName);
  64:   }
  65: 
  66:   public GetPropertyAction(String propName, String defaultValue)
  67:   {
  68:     setParameters(propName, defaultValue);
  69:   }
  70: 
  71:   public String run()
  72:   {
  73:     return System.getProperty(name, value);
  74:   }
  75: 
  76:   public GetPropertyAction setParameters(String propName)
  77:   {
  78:     this.name = propName;
  79:     this.value = null;
  80:     return this;
  81:   }
  82: 
  83:   public GetPropertyAction setParameters(String propName, String defaultValue)
  84:   {
  85:     this.name = propName;
  86:     this.value = defaultValue;
  87:     return this;
  88:   }
  89: }