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Diffstat (limited to 'libjava/classpath/gnu/CORBA/gnuValueHolder.java')
-rw-r--r-- | libjava/classpath/gnu/CORBA/gnuValueHolder.java | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/CORBA/gnuValueHolder.java b/libjava/classpath/gnu/CORBA/gnuValueHolder.java new file mode 100644 index 000000000..d3f2b6b58 --- /dev/null +++ b/libjava/classpath/gnu/CORBA/gnuValueHolder.java @@ -0,0 +1,135 @@ +/* gnuValueHolder.java -- + Copyright (C) 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.CORBA; + +import gnu.CORBA.CDR.Vio; + +import org.omg.CORBA.TypeCode; +import org.omg.CORBA.ValueBaseHolder; +import org.omg.CORBA.portable.BoxedValueHelper; +import org.omg.CORBA.portable.InputStream; +import org.omg.CORBA.portable.OutputStream; + +import java.io.Serializable; + +/** + * Boxed value holder that also remembers the value type and the value helper. + * + * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org) + */ +public class gnuValueHolder + extends ValueBaseHolder +{ + /** + * The type code of the stored value. + */ + TypeCode type; + + /** + * The helper that could read and write fields of the boxed value. + */ + transient BoxedValueHelper helper; + + /** + * If true, the helper not available. + */ + transient boolean helper_NA; + + /** + * Create a new instance for the given value and given type. + */ + public gnuValueHolder(Serializable value, TypeCode a_type) + { + super(value); + type = a_type; + } + + /** + * Get the true type, as it was passed in the constructor. + */ + public TypeCode _type() + { + return type; + } + + /** + * Write content to the output stream. Tries to locate the + * corresponding helper class. + */ + public void _write(OutputStream output) + { + findHelper(); + if (helper == null) + super._write(output); + else + Vio.write(output, value, helper); + } + + /** + * Read, trying to locate helper, if possible. + */ + public void _read(InputStream input) + { + findHelper(); + if (helper == null) + super._read(input); + else + value = Vio.read(input, helper); + } + + /** + * Set the read and write methods. + */ + void findHelper() + { + if (helper != null || helper_NA) + return; + try + { + Class helperClass = + ObjectCreator.forName(ObjectCreator.toHelperName(type.id())); + + helper = (BoxedValueHelper) helperClass.newInstance(); + } + catch (Exception ex) + { + helper_NA = true; + } + } +} |