| 1 |
775 |
jeremybenn |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
|
| 2 |
|
|
<!-- package.html -
|
| 3 |
|
|
Copyright (C) 2005 Free Software Foundation, Inc.
|
| 4 |
|
|
|
| 5 |
|
|
This file is part of GNU Classpath.
|
| 6 |
|
|
|
| 7 |
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
| 8 |
|
|
it under the terms of the GNU General Public License as published by
|
| 9 |
|
|
the Free Software Foundation; either version 2, or (at your option)
|
| 10 |
|
|
any later version.
|
| 11 |
|
|
|
| 12 |
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
| 13 |
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 14 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
| 15 |
|
|
General Public License for more details.
|
| 16 |
|
|
|
| 17 |
|
|
You should have received a copy of the GNU General Public License
|
| 18 |
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
| 19 |
|
|
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
| 20 |
|
|
02110-1301 USA.
|
| 21 |
|
|
|
| 22 |
|
|
Linking this library statically or dynamically with other modules is
|
| 23 |
|
|
making a combined work based on this library. Thus, the terms and
|
| 24 |
|
|
conditions of the GNU General Public License cover the whole
|
| 25 |
|
|
combination.
|
| 26 |
|
|
|
| 27 |
|
|
As a special exception, the copyright holders of this library give you
|
| 28 |
|
|
permission to link this library with independent modules to produce an
|
| 29 |
|
|
executable, regardless of the license terms of these independent
|
| 30 |
|
|
modules, and to copy and distribute the resulting executable under
|
| 31 |
|
|
terms of your choice, provided that you also meet, for each linked
|
| 32 |
|
|
independent module, the terms and conditions of the license of that
|
| 33 |
|
|
module. An independent module is a module which is not derived from
|
| 34 |
|
|
or based on this library. If you modify this library, you may extend
|
| 35 |
|
|
this exception to your version of the library, but you are not
|
| 36 |
|
|
obligated to do so. If you do not wish to do so, delete this
|
| 37 |
|
|
exception statement from your version. -->
|
| 38 |
|
|
|
| 39 |
|
|
<html>
|
| 40 |
|
|
<head><title>GNU Classpath - org.omg.DynamicAny</title></head>
|
| 41 |
|
|
|
| 42 |
|
|
<body>
|
| 43 |
|
|
<p>DynAny's allow to work with data structures, exact content of those is not
|
| 44 |
|
|
known at the time of compilation. In this way, the conception of DynAny
|
| 45 |
|
|
remebers the java reflection mechanism. DynAny usually obtain the value from
|
| 46 |
|
|
the {@link org.omg.CORBA.Any} that, if needed, can carry highly nested data
|
| 47 |
|
|
structures (like array of sequences of unions). DynAny's allow to see/modify
|
| 48 |
|
|
all parts of such structures. This is especially helpful for writing generic
|
| 49 |
|
|
servers (bridges, event channels supporting, filtering and so on). Similarly,
|
| 50 |
|
|
DynAny's can create an Any at runtime, without having static knowledge of its
|
| 51 |
|
|
type. This is helpful for writing generic clients like browsers, debuggers or
|
| 52 |
|
|
user interface tools.
|
| 53 |
|
|
</p><p>
|
| 54 |
|
|
The API clearly states that DynAny and DynAnyFactory objects are local and
|
| 55 |
|
|
cannot be transferred to remote server or client. While such methods are
|
| 56 |
|
|
formally defined in the corresponding helpers, they simply always throw MARSHAL.
|
| 57 |
|
|
</p><p>
|
| 58 |
|
|
DynAny's are created by {@link DynAnyFactory}. The factory is obtaines by
|
| 59 |
|
|
{@link org.omg.CORBA.ORB#resolve_initial_references):
|
| 60 |
|
|
<code>
|
| 61 |
|
|
ORB orb = ORB.init(new String[0], null);
|
| 62 |
|
|
DynAnyFactory f = DynAnyFactoryHelper.narrow(orb.resolve_initial_references("DynAnyFactory"));
|
| 63 |
|
|
</code>
|
| 64 |
|
|
DynAny's are also returned by some methods, invoked on another DynAny.
|
| 65 |
|
|
</p><p>
|
| 66 |
|
|
The primitive types like string or char are wrapped into an ordinary DynAny. It
|
| 67 |
|
|
has multiple methods for setting/getting the content like
|
| 68 |
|
|
{@link DynAnyOperations#get_string()} or
|
| 69 |
|
|
{@link DynAnyOperations#insert_string(String)}. The more complex types like
|
| 70 |
|
|
sequences or structures are wrapped into specialised DynAny's, providing means
|
| 71 |
|
|
to access the enclosed members. In this case, the DynAny has the
|
| 72 |
|
|
"internal cursor", normally pointing at one of the members in the data
|
| 73 |
|
|
structure. The "internal cursor" can be set to the needed position
|
| 74 |
|
|
{@link DynAnyOperations#seek(int)} or advanced forward
|
| 75 |
|
|
({@link DynAnyOperations#next()}. The member under cursor is returned by
|
| 76 |
|
|
{@link DynAnyOperations#current_component()}. For composite DynAnys the
|
| 77 |
|
|
methods like {@link DynAnyOperations#get_string()} or
|
| 78 |
|
|
{@link DynAnyOperations#insert_string(String)} apply to the selected member,
|
| 79 |
|
|
not to the complex DynAny in general.
|
| 80 |
|
|
</p><p>
|
| 81 |
|
|
DynAnys are created and optimized for traversing values extracted from anys
|
| 82 |
|
|
or constructing values of anys at runtime. OMG does not recommend to use them
|
| 83 |
|
|
for other purposes.
|
| 84 |
|
|
</p><p>
|
| 85 |
|
|
@author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
|
| 86 |
|
|
</body>
|
| 87 |
|
|
</html>
|
