/// <summary>
/// Check and see if this set of permissions implies the permissions
/// expressed in "permission".
/// </summary>
/// <param name="permission"> the Permission object to compare
/// </param>
/// <returns> true if "permission" is a proper subset of a permission in
/// the set, false if not. </returns>
public override bool Implies(Permission permission)
{
if (!(permission is FilePermission))
{
return(false);
}
FilePermission fp = (FilePermission)permission;
int desired = fp.Mask;
int effective = 0;
int needed = desired;
lock (this)
{
int len = Perms.Count;
for (int i = 0; i < len; i++)
{
FilePermission x = (FilePermission)Perms[i];
if (((needed & x.Mask) != 0) && x.ImpliesIgnoreMask(fp))
{
effective |= x.Mask;
if ((effective & desired) == desired)
{
return(true);
}
needed = (desired ^ effective);
}
}
}
return(false);
}
/// <summary>
/// Checks if this FilePermission object "implies" the specified permission.
/// <P>
/// More specifically, this method returns true if:
/// <ul>
/// <li> <i>p</i> is an instanceof FilePermission,
/// <li> <i>p</i>'s actions are a proper subset of this
/// object's actions, and
/// <li> <i>p</i>'s pathname is implied by this object's
/// pathname. For example, "/tmp/*" implies "/tmp/foo", since
/// "/tmp/*" encompasses all files in the "/tmp" directory,
/// including the one named "foo".
/// </ul>
/// </summary>
/// <param name="p"> the permission to check against.
/// </param>
/// <returns> <code>true</code> if the specified permission is not
/// <code>null</code> and is implied by this object,
/// <code>false</code> otherwise. </returns>
public override bool Implies(Permission p)
{
if (!(p is FilePermission))
{
return(false);
}
FilePermission that = (FilePermission)p;
// we get the effective mask. i.e., the "and" of this and that.
// They must be equal to that.mask for implies to return true.
return(((this.Mask_Renamed & that.Mask_Renamed) == that.Mask_Renamed) && ImpliesIgnoreMask(that));
}
/// <summary>
/// Checks two FilePermission objects for equality. Checks that <i>obj</i> is
/// a FilePermission, and has the same pathname and actions as this object.
/// </summary>
/// <param name="obj"> the object we are testing for equality with this object. </param>
/// <returns> <code>true</code> if obj is a FilePermission, and has the same
/// pathname and actions as this FilePermission object,
/// <code>false</code> otherwise. </returns>
public override bool Equals(Object obj)
{
if (obj == this)
{
return(true);
}
if (!(obj is FilePermission))
{
return(false);
}
FilePermission that = (FilePermission)obj;
return((this.Mask_Renamed == that.Mask_Renamed) && this.Cpath.Equals(that.Cpath) && (this.Directory == that.Directory) && (this.Recursive == that.Recursive));
}
/// <summary>
/// Checks if the Permission's actions are a proper subset of the
/// this object's actions. Returns the effective mask iff the
/// this FilePermission's path also implies that FilePermission's path.
/// </summary>
/// <param name="that"> the FilePermission to check against. </param>
/// <returns> the effective mask </returns>
internal bool ImpliesIgnoreMask(FilePermission that)
{
if (this.Directory)
{
if (this.Recursive)
{
// make sure that.path is longer then path so
// something like /foo/- does not imply /foo
if (that.Directory)
{
return((that.Cpath.Length() >= this.Cpath.Length()) && that.Cpath.StartsWith(this.Cpath));
}
else
{
return((that.Cpath.Length() > this.Cpath.Length()) && that.Cpath.StartsWith(this.Cpath));
}
}
else
{
if (that.Directory)
{
// if the permission passed in is a directory
// specification, make sure that a non-recursive
// permission (i.e., this object) can't imply a recursive
// permission.
if (that.Recursive)
{
return(false);
}
else
{
return(this.Cpath.Equals(that.Cpath));
}
}
else
{
int last = that.Cpath.LastIndexOf(System.IO.Path.DirectorySeparatorChar);
if (last == -1)
{
return(false);
}
else
{
// this.cpath.equals(that.cpath.substring(0, last+1));
// Use regionMatches to avoid creating new string
return((this.Cpath.Length() == (last + 1)) && this.Cpath.RegionMatches(0, that.Cpath, 0, last + 1));
}
}
}
}
else if (that.Directory)
{
// if this is NOT recursive/wildcarded,
// do not let it imply a recursive/wildcarded permission
return(false);
}
else
{
return(this.Cpath.Equals(that.Cpath));
}
}
public PrivilegedActionAnonymousInnerClassHelper(FilePermission outerInstance)
{
this.OuterInstance = outerInstance;
}
