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87 lines
4.3 KiB
HTML
87 lines
4.3 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<!-- package.html -
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Copyright (C) 2005 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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<html>
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<head><title>GNU Classpath - org.omg.DynamicAny</title></head>
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<body>
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<p>DynAny's allow to work with data structures, exact content of those is not
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known at the time of compilation. In this way, the conception of DynAny
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remebers the java reflection mechanism. DynAny usually obtain the value from
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the {@link org.omg.CORBA.Any} that, if needed, can carry highly nested data
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structures (like array of sequences of unions). DynAny's allow to see/modify
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all parts of such structures. This is especially helpful for writing generic
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servers (bridges, event channels supporting, filtering and so on). Similarly,
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DynAny's can create an Any at runtime, without having static knowledge of its
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type. This is helpful for writing generic clients like browsers, debuggers or
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user interface tools.
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</p><p>
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The API clearly states that DynAny and DynAnyFactory objects are local and
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cannot be transferred to remote server or client. While such methods are
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formally defined in the corresponding helpers, they simply always throw MARSHAL.
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</p><p>
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DynAny's are created by {@link DynAnyFactory}. The factory is obtaines by
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{@link org.omg.CORBA.ORB#resolve_initial_references):
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<code>
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ORB orb = ORB.init(new String[0], null);
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DynAnyFactory f = DynAnyFactoryHelper.narrow(orb.resolve_initial_references("DynAnyFactory"));
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</code>
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DynAny's are also returned by some methods, invoked on another DynAny.
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</p><p>
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The primitive types like string or char are wrapped into an ordinary DynAny. It
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has multiple methods for setting/getting the content like
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{@link DynAnyOperations#get_string()} or
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{@link DynAnyOperations#insert_string(String)}. The more complex types like
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sequences or structures are wrapped into specialised DynAny's, providing means
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to access the enclosed members. In this case, the DynAny has the
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"internal cursor", normally pointing at one of the members in the data
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structure. The "internal cursor" can be set to the needed position
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{@link DynAnyOperations#seek(int)} or advanced forward
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({@link DynAnyOperations#next()}. The member under cursor is returned by
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{@link DynAnyOperations#current_component()}. For composite DynAnys the
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methods like {@link DynAnyOperations#get_string()} or
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{@link DynAnyOperations#insert_string(String)} apply to the selected member,
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not to the complex DynAny in general.
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</p><p>
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DynAnys are created and optimized for traversing values extracted from anys
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or constructing values of anys at runtime. OMG does not recommend to use them
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for other purposes.
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</p><p>
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@author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
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</body>
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</html>
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