| /* 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.ORB; |
| 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 ]); |
| } |
| } |