/// <summary>
/// Gets the PermissionCollection in this Permissions object for
/// permissions whose type is the same as that of <i>p</i>.
/// For example, if <i>p</i> is a FilePermission,
/// the FilePermissionCollection
/// stored in this Permissions object will be returned.
///
/// If createEmpty is true,
/// this method creates a new PermissionCollection object for the specified
/// type of permission objects if one does not yet exist.
/// To do so, it first calls the {@code newPermissionCollection} method
/// on <i>p</i>. Subclasses of class Permission
/// override that method if they need to store their permissions in a
/// particular PermissionCollection object in order to provide the
/// correct semantics when the {@code PermissionCollection.implies}
/// method is called.
/// If the call returns a PermissionCollection, that collection is stored
/// in this Permissions object. If the call returns null and createEmpty
/// is true, then
/// this method instantiates and stores a default PermissionCollection
/// that uses a hashtable to store its permission objects.
///
/// createEmpty is ignored when creating empty PermissionCollection
/// for unresolved permissions because of the overhead of determining the
/// PermissionCollection to use.
///
/// createEmpty should be set to false when this method is invoked from
/// implies() because it incurs the additional overhead of creating and
/// adding an empty PermissionCollection that will just return false.
/// It should be set to true when invoked from add().
/// </summary>
private PermissionCollection GetPermissionCollection(Permission p, bool createEmpty)
{
Class c = p.GetType();
PermissionCollection pc = PermsMap[c];
if (!HasUnresolved && !createEmpty)
{
return(pc);
}
else if (pc == null)
{
// Check for unresolved permissions
pc = (HasUnresolved ? GetUnresolvedPermissions(p) : null);
// if still null, create a new collection
if (pc == null && createEmpty)
{
pc = p.NewPermissionCollection();
// still no PermissionCollection?
// We'll give them a PermissionsHash.
if (pc == null)
{
pc = new PermissionsHash();
}
}
if (pc != null)
{
PermsMap[c] = pc;
}
}
return(pc);
}
/// <summary>
/// Resolves any unresolved permissions of type p.
/// </summary>
/// <param name="p"> the type of unresolved permission to resolve
/// </param>
/// <returns> PermissionCollection containing the unresolved permissions,
/// or null if there were no unresolved permissions of type p.
/// </returns>
private PermissionCollection GetUnresolvedPermissions(Permission p)
{
// Called from within synchronized method so permsMap doesn't need lock
UnresolvedPermissionCollection uc = (UnresolvedPermissionCollection)PermsMap[typeof(UnresolvedPermission)];
// we have no unresolved permissions if uc is null
if (uc == null)
{
return(null);
}
IList <UnresolvedPermission> unresolvedPerms = uc.GetUnresolvedPermissions(p);
// we have no unresolved permissions of this type if unresolvedPerms is null
if (unresolvedPerms == null)
{
return(null);
}
java.security.cert.Certificate[] certs = null;
Object[] signers = p.GetType().Signers;
int n = 0;
if (signers != null)
{
for (int j = 0; j < signers.Length; j++)
{
if (signers[j] is java.security.cert.Certificate)
{
n++;
}
}
certs = new java.security.cert.Certificate[n];
n = 0;
for (int j = 0; j < signers.Length; j++)
{
if (signers[j] is java.security.cert.Certificate)
{
certs[n++] = (java.security.cert.Certificate)signers[j];
}
}
}
PermissionCollection pc = null;
lock (unresolvedPerms)
{
int len = unresolvedPerms.Count;
for (int i = 0; i < len; i++)
{
UnresolvedPermission up = unresolvedPerms[i];
Permission perm = up.Resolve(p, certs);
if (perm != null)
{
if (pc == null)
{
pc = p.NewPermissionCollection();
if (pc == null)
{
pc = new PermissionsHash();
}
}
pc.Add(perm);
}
}
}
return(pc);
}
