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+/* IDLTypeHelper.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.CDR;
+
+import gnu.CORBA.Minor;
+
+import org.omg.CORBA.MARSHAL;
+import org.omg.CORBA.portable.BoxedValueHelper;
+import org.omg.CORBA.portable.InputStream;
+import org.omg.CORBA.portable.OutputStream;
+
+import java.io.Serializable;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+
+/**
+ * Handles case when the CORBA IDL type with the known helper is wrapped into
+ * Value type.
+ *
+ * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
+ */
+public class IDLTypeHelper
+ implements BoxedValueHelper
+{
+ /**
+ * A helper class.
+ */
+ protected Class helper;
+
+ /**
+ * Argument values for Helper.id().
+ */
+ static final Object[] ARGS_ID_V = new Object[0];
+
+ /**
+ * Argument types for Helper.id()).
+ */
+ static final Class[] ARGS_ID = new Class[0];
+
+ /**
+ * Argument types for Helper.read.
+ */
+ static final Class[] ARGS_READ = new Class[] { org.omg.CORBA.portable.InputStream.class };
+
+ /**
+ * Create an IDLTypeHelper that works via given helper class.
+ */
+ public IDLTypeHelper(Class a_helperClass)
+ {
+ helper = a_helperClass;
+ }
+
+ /**
+ * Get the Id, returned by this helper (use reflection).
+ */
+ public String get_id()
+ {
+ try
+ {
+ Method m = helper.getMethod("id", ARGS_ID);
+ return (String) m.invoke(null, ARGS_ID_V);
+ }
+ catch (Exception ex)
+ {
+ MARSHAL m = new MARSHAL(msg() + " id()");
+ m.minor = Minor.Boxed;
+ m.initCause(ex);
+ throw m;
+ }
+ }
+
+ /**
+ * Read an instance from the stream.
+ */
+ public Serializable read_value(InputStream input)
+ {
+ try
+ {
+ Method m = helper.getMethod("read", ARGS_READ);
+ return (Serializable) m.invoke(null, new Object[] { input });
+ }
+ catch (Exception ex)
+ {
+ MARSHAL m = new MARSHAL(msg() + " read(..)");
+ m.minor = Minor.Boxed;
+ m.initCause(ex);
+ throw m;
+ }
+ }
+
+ /**
+ * Write the instance to the stream.
+ */
+ public void write_value(OutputStream output, Serializable value)
+ {
+ try
+ {
+ Method[] m = helper.getMethods();
+
+ for (int i = 0; i < m.length; i++)
+ {
+ if (m[i].getName().equals("write")
+ && ((m[i].getModifiers() & Modifier.STATIC) != 0))
+ {
+ Class[] p = m[i].getParameterTypes();
+
+ if (p.length == 2 && OutputStream.class.isAssignableFrom(p[0])
+ && p[1].isAssignableFrom(value.getClass()))
+ {
+ m[i].invoke(null, new Object[] { output, value });
+ return;
+ }
+ }
+ }
+ }
+ catch (Exception ex)
+ {
+ MARSHAL m = new MARSHAL(msg() + " write(..)");
+ m.minor = Minor.Boxed;
+ m.initCause(ex);
+ throw m;
+ }
+ }
+
+ /**
+ * Create the start of message for exceptions.
+ */
+ String msg()
+ {
+ return "Failed calling " + helper.getName() + " method: ";
+ }
+
+}