mirror of git://gcc.gnu.org/git/gcc.git
299 lines
8.8 KiB
Java
299 lines
8.8 KiB
Java
/* FilePermission.java --
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Copyright (C) 1998, 2000, 2003, 2004, 2005, 2006
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Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.io;
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import java.security.Permission;
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public final class FilePermission extends Permission implements Serializable
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{
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private static final long serialVersionUID = 7930732926638008763L;
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private static final String ALL_FILES = "<<ALL FILES>>";
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private boolean readPerm = false;
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private boolean writePerm = false;
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private boolean executePerm = false;
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private boolean deletePerm = false;
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private final String actionsString;
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// Checks and caches the actions
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private void checkPerms() throws IllegalArgumentException
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{
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String action;
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int i = actionsString.indexOf(',');
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int startI = 0;
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while (i != -1)
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{
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action = actionsString.substring(startI, i).trim().toLowerCase();
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if (action.equals("read"))
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readPerm = true;
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else if (action.equals("write"))
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writePerm = true;
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else if (action.equals("execute"))
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executePerm = true;
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else if (action.equals("delete"))
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deletePerm = true;
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else
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throw new IllegalArgumentException("Unknown action: " + action);
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startI = i + 1;
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i = actionsString.indexOf(',', startI);
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}
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action = actionsString.substring(startI).trim().toLowerCase();
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if (action.equals("read"))
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readPerm = true;
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else if (action.equals("write"))
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writePerm = true;
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else if (action.equals("execute"))
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executePerm = true;
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else if (action.equals("delete"))
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deletePerm = true;
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else
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throw new IllegalArgumentException("Unknown action: " + action);
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}
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/**
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* Create a new FilePermission.
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*
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* @param pathExpression an expression specifying the paths this
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* permission represents.
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* @param actionsString a comma-separated list of the actions this
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* permission represents. The actions must be "read", "write",
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* "execute" and/or "delete".
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*/
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public FilePermission(String pathExpression, String actionsString)
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{
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// FIXME: what to do when the file string is malformed?
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super(pathExpression);
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if (pathExpression == null)
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throw new NullPointerException("pathExpression");
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if (actionsString == null)
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throw new IllegalArgumentException("actionsString");
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this.actionsString = actionsString;
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checkPerms();
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}
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/**
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* Get the actions this FilePermission supports.
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* @return the String representing the actions this FilePermission supports.
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*/
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public String getActions()
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{
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return actionsString;
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}
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/**
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* Get the hash code for this Object.<P>
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* FilePermission's hash code is calculated as the exclusive or of the
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* target
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* String's hash code and the action String's hash code.
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* @specnote Sun did not specify how to calculate the hash code;
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* I made this up.
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* @return the hash code for this Object.
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*/
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public int hashCode()
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{
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return getName().hashCode() ^ actionsString.hashCode();
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}
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/**
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* Check two FilePermissions for semantic equality.
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* Two FilePermissions are exactly equivalent if they have identical path
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* expressions and have exactly the same access permissions.
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* @param o the Object to compare to.
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* @return whether the Objects are semantically equivalent.
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*/
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public boolean equals(Object o)
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{
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if (! (o instanceof FilePermission))
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return false;
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FilePermission p = (FilePermission) o;
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String f1 = getName();
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String f2 = p.getName();
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// Compare names, taking into account if they refer to a directory
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// and one has a separator and the other does not.
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if (f1.length() > 0 && f1.charAt(f1.length() - 1) == File.separatorChar)
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{
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if (f2.length() > 0
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&& f2.charAt(f2.length() - 1) == File.separatorChar)
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{
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if (! f2.equals(f1))
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return false;
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}
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else
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{
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if (! f2.equals(f1.substring(0, f1.length() - 1)))
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return false;
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}
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}
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else
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{
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if (f2.length() > 0
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&& f2.charAt(f2.length() - 1) == File.separatorChar)
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{
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if (! f1.equals(f2.substring(0, f2.length() - 1)))
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return false;
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}
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else
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{
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if (! f1.equals(f2))
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return false;
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}
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}
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return (readPerm == p.readPerm
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&& writePerm == p.writePerm
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&& executePerm == p.executePerm
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&& deletePerm == p.deletePerm);
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}
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/**
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* Check to see if this permission implies another.
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* Permission A implies permission B if these things are all true:
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* <OL>
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* <LI>A and B are both FilePermissions.</LI>
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* <LI>All possible files in B are included in A
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* (possibly more are in A).</LI>
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* <LI>All actions B supports, A also supports.</LI>
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* </OL>
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* @param p the Permission to compare against.
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* @return whether this Permission implies p
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*/
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public boolean implies(Permission p)
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{
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if (! (p instanceof FilePermission))
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return false;
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String f1 = getName();
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if (f1.equals(ALL_FILES))
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return true;
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FilePermission fp = (FilePermission) p;
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String f2 = fp.getName();
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if (f2.equals(ALL_FILES))
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return false;
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try
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{
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f1 = new File(f1).getCanonicalPath();
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f2 = new File(f2).getCanonicalPath();
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}
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catch (IOException ioe)
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{
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return false;
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}
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String sub1;
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switch (f1.charAt(f1.length() - 1))
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{
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case '*':
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sub1 = f1.substring(0, f1.length() - 1); // chop off "*"
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if (f2.length() <= sub1.length())
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{
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// If it's smaller, there is no way it could be part of
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// this directory. If it's the same (or length - 1), it
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// could be the same directory but specifies access to
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// the directory rather than the files in it.
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return false;
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}
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else if (f2.charAt(sub1.length() - 1) == File.separatorChar)
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{
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// Make sure the part before the "/" is the same.
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if (! f2.substring(0, sub1.length()).equals(sub1))
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return false;
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// Make sure there are no subdirectories specified
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// underneath this one.
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if (f2.substring(sub1.length() + 1).indexOf(File.separatorChar)
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!= -1)
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return false;
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}
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else
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{
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// Obviously not equal: f2 is either not a directory or
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// is not the same directory (its name continues further
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// than we want).
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return false;
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}
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break;
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case '-':
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// Chop off "/-".
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sub1 = f1.substring(0, f1.length() - 2);
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if (f2.length() < sub1.length())
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{
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// If it's smaller, there is no way it could be part of
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// this directory.
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return false;
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}
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else if (f2.length() > sub1.length()
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&& f2.charAt(sub1.length()) != File.separatorChar)
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return false;
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else if (! f2.substring(0, sub1.length()).equals(sub1))
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return false;
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break;
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default:
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if (f2.charAt(f2.length() - 1) == File.separatorChar)
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{
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if (! f1.equals(f2.substring(0, f2.length() - 1)))
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return false;
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}
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else if (!f1.equals(f2))
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return false;
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break;
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}
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if (fp.readPerm && ! readPerm)
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return false;
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if (fp.writePerm && ! writePerm)
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return false;
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if (fp.executePerm && ! executePerm)
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return false;
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if (fp.deletePerm && ! deletePerm)
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return false;
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return true;
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}
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}
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