1 /* FilePermission.java --
2 Copyright (C) 1998, 2000, 2003, 2004, 2005 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
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)
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.
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
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
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. */
41 import java
.security
.Permission
;
43 public final class FilePermission
extends Permission
implements Serializable
45 private static final long serialVersionUID
= 7930732926638008763L;
47 private static final String CURRENT_DIRECTORY
=
48 System
.getProperty("user.dir");
50 private static final String ALL_FILES
= "<<ALL FILES>>";
52 private boolean readPerm
= false;
53 private boolean writePerm
= false;
54 private boolean executePerm
= false;
55 private boolean deletePerm
= false;
56 private final String actionsString
;
58 // Checks and caches the actions
59 private void checkPerms() throws IllegalArgumentException
62 int i
= actionsString
.indexOf(',');
66 action
= actionsString
.substring(startI
, i
).trim().toLowerCase();
67 if (action
.equals("read"))
69 else if (action
.equals("write"))
71 else if (action
.equals("execute"))
73 else if (action
.equals("delete"))
76 throw new IllegalArgumentException("Unknown action: " + action
);
79 i
= actionsString
.indexOf(',', startI
);
82 action
= actionsString
.substring(startI
).trim().toLowerCase();
83 if (action
.equals("read"))
85 else if (action
.equals("write"))
87 else if (action
.equals("execute"))
89 else if (action
.equals("delete"))
92 throw new IllegalArgumentException("Unknown action: " + action
);
96 * Create a new FilePermission.
98 * @param pathExpression an expression specifying the paths this
99 * permission represents.
100 * @param actionsString a comma-separated list of the actions this
101 * permission represents. The actions must be "read", "write",
102 * "execute" and/or "delete".
104 public FilePermission(String pathExpression
, String actionsString
)
106 // FIXME: what to do when the file string is malformed?
107 super(pathExpression
);
108 if (pathExpression
== null)
109 throw new NullPointerException("pathExpression");
110 if (actionsString
== null)
111 throw new IllegalArgumentException("actionsString");
112 this.actionsString
= actionsString
;
117 * Get the actions this FilePermission supports.
118 * @return the String representing the actions this FilePermission supports.
120 public String
getActions()
122 return actionsString
;
126 * Get the hash code for this Object.<P>
127 * FilePermission's hash code is calculated as the exclusive or of the
129 * String's hash code and the action String's hash code.
130 * @specnote Sun did not specify how to calculate the hash code;
132 * @return the hash code for this Object.
134 public int hashCode()
136 return getName().hashCode() ^ actionsString
.hashCode();
140 * Check two FilePermissions for semantic equality.
141 * Two FilePermissions are exactly equivalent if they have identical path
142 * expressions and have exactly the same access permissions.
143 * @param o the Object to compare to.
144 * @return whether the Objects are semantically equivalent.
146 public boolean equals(Object o
)
148 if (! (o
instanceof FilePermission
))
150 FilePermission p
= (FilePermission
) o
;
152 String f1
= getName();
153 String f2
= p
.getName();
155 // Compare names, taking into account if they refer to a directory
156 // and one has a separator and the other does not.
157 if (f1
.length() > 0 && f1
.charAt(f1
.length() - 1) == File
.separatorChar
)
160 && f2
.charAt(f2
.length() - 1) == File
.separatorChar
)
167 if (! f2
.equals(f1
.substring(0, f1
.length() - 1)))
174 && f2
.charAt(f2
.length() - 1) == File
.separatorChar
)
176 if (! f1
.equals(f2
.substring(0, f2
.length() - 1)))
185 return (readPerm
== p
.readPerm
186 && writePerm
== p
.writePerm
187 && executePerm
== p
.executePerm
188 && deletePerm
== p
.deletePerm
);
192 * Check to see if this permission implies another.
193 * Permission A implies permission B if these things are all true:
195 * <LI>A and B are both FilePermissions.</LI>
196 * <LI>All possible files in B are included in A
197 * (possibly more are in A).</LI>
198 * <LI>All actions B supports, A also supports.</LI>
200 * @param p the Permission to compare against.
201 * @return whether this Permission implies p
203 public boolean implies(Permission p
)
205 if (! (p
instanceof FilePermission
))
208 String f1
= getName();
210 if (f1
.equals(ALL_FILES
))
213 FilePermission fp
= (FilePermission
) p
;
214 String f2
= fp
.getName();
216 if (f1
.charAt(0) != File
.separatorChar
)
217 f1
= CURRENT_DIRECTORY
+ f1
;
218 if (f2
.charAt(0) != File
.separatorChar
)
219 f2
= CURRENT_DIRECTORY
+ f2
;
223 switch (f1
.charAt(f1
.length() - 1))
226 sub1
= f1
.substring(0, f1
.length() - 1); // chop off "*"
227 if (f2
.length() <= sub1
.length())
229 // If it's smaller, there is no way it could be part of
230 // this directory. If it's the same (or length - 1), it
231 // could be the same directory but specifies access to
232 // the directory rather than the files in it.
235 else if (f2
.charAt(sub1
.length() - 1) == File
.separatorChar
)
237 // Make sure the part before the "/" is the same.
238 if (! f2
.substring(0, sub1
.length()).equals(sub1
))
240 // Make sure there are no subdirectories specified
241 // underneath this one.
242 if (f2
.substring(sub1
.length() + 1).indexOf(File
.separatorChar
)
248 // Obviously not equal: f2 is either not a directory or
249 // is not the same directory (its name continues further
256 sub1
= f1
.substring(0, f1
.length() - 2);
257 if (f2
.length() < sub1
.length())
259 // If it's smaller, there is no way it could be part of
263 else if (f2
.length() > sub1
.length()
264 && f2
.charAt(sub1
.length()) != File
.separatorChar
)
266 else if (! f2
.substring(0, sub1
.length()).equals(sub1
))
271 if (f2
.charAt(f2
.length() - 1) == File
.separatorChar
)
273 if (! f1
.equals(f2
.substring(0, f2
.length() - 1)))
276 else if (!f1
.equals(f2
))
281 if (fp
.readPerm
&& ! readPerm
)
283 if (fp
.writePerm
&& ! writePerm
)
285 if (fp
.executePerm
&& ! executePerm
)
287 if (fp
.deletePerm
&& ! deletePerm
)