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+/* TreeNodeHelper.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.classpath.examples.CORBA.SimpleCommunication.communication;
+
+
+import gnu.CORBA.OrbRestricted;
+
+import org.omg.CORBA.Any;
+import org.omg.CORBA.StructMember;
+import org.omg.CORBA.TypeCode;
+import org.omg.CORBA.portable.InputStream;
+import org.omg.CORBA.portable.OutputStream;
+
+/**
+ * This class is used for various helper operations around the
+ * tree {@link} structure.
+ *
+ * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
+ */
+public abstract class TreeNodeHelper
+{
+ /**
+ * The TreeNode repository id, used to identify the structure.
+ */
+ private static String _id =
+ "IDL:gnu/classpath/examples/CORBA/SimpleCommunication/communication/TreeNode:1.0";
+
+ /**
+ * Caches the typecode, allowing to compute it only once.
+ */
+ private static TypeCode typeCode;
+
+ /**
+ * This is used to handle the recursive object references in
+ * CORBA - supported way. The tree TreeNode definition is recursive,
+ * as the TreeNode contains the sequence of the nodes as its field.
+ */
+ private static boolean active;
+
+ /**
+ * Extract the tree TreeNode from the unversal CORBA wrapper, Any.
+ */
+ public static TreeNode extract(Any a)
+ {
+ return read(a.create_input_stream());
+ }
+
+ /**
+ * Get the TreeNode string identifer.
+ */
+ public static String id()
+ {
+ return _id;
+ }
+
+ /**
+ * Insert the TreeNode into the universal CORBA wrapper, Any.
+ */
+ public static void insert(Any a, TreeNode that)
+ {
+ OutputStream out = a.create_output_stream();
+ a.type(type());
+ write(out, that);
+ a.read_value(out.create_input_stream(), type());
+ }
+
+ /**
+ * Read the TreeNode from the common data reprentation (CDR) stream.
+ */
+ public static TreeNode read(InputStream istream)
+ {
+ TreeNode value = new TreeNode();
+ value.name = istream.read_string();
+
+ int _len0 = istream.read_long();
+ value.children = new TreeNode[ _len0 ];
+ for (int i = 0; i < value.children.length; ++i)
+ value.children [ i ] = TreeNodeHelper.read(istream);
+ return value;
+ }
+
+ /**
+ * Get the TreeNode type code definition.
+ */
+ public static synchronized TypeCode type()
+ {
+ // Compute the type code only once.
+ if (typeCode == null)
+ {
+ synchronized (TypeCode.class)
+ {
+ if (typeCode == null)
+ {
+ // To avoid the infinite recursion loop, the
+ // recursive reference is handled in specific way.
+ if (active)
+ return OrbRestricted.Singleton.create_recursive_tc(_id);
+ active = true;
+
+ // List all memebers of the TreeNode structure.
+ StructMember[] members = new StructMember[ 2 ];
+ TypeCode memberType;
+ memberType = OrbRestricted.Singleton.create_string_tc(0);
+ members [ 0 ] = new StructMember("name", memberType, null);
+ memberType = OrbRestricted.Singleton.create_recursive_tc("");
+ members [ 1 ] = new StructMember("children", memberType, null);
+ typeCode =
+ OrbRestricted.Singleton.create_struct_tc(TreeNodeHelper.id(), "TreeNode", members);
+ active = false;
+ }
+ }
+ }
+ return typeCode;
+ }
+
+ /**
+ * Write the TreeNode into the common data reprentation (CDR) stream.
+ */
+ public static void write(OutputStream ostream, TreeNode value)
+ {
+ ostream.write_string(value.name);
+ ostream.write_long(value.children.length);
+ for (int i = 0; i < value.children.length; ++i)
+ TreeNodeHelper.write(ostream, value.children [ i ]);
+ }
+}