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   1 /* TreeNodeHelper.java --
   2    Copyright (C) 2005 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.classpath.examples.CORBA.SimpleCommunication.communication;
  40
  41 import org.omg.CORBA.Any;
  42 import org.omg.CORBA.ORB;
  43 import org.omg.CORBA.StructMember;
  44 import org.omg.CORBA.TypeCode;
  45 import org.omg.CORBA.portable.InputStream;
  46 import org.omg.CORBA.portable.OutputStream;
  47
  48 /**
  49  * This class is used for various helper operations around the
  50  * tree {@link} structure.
  51  *
  52  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  53  */
  54 public abstract class TreeNodeHelper
  55 {
  56   /**
  57    * The TreeNode repository id, used to identify the structure.
  58    */
  59   private static String _id =
  60     "IDL:gnu/classpath/examples/CORBA/SimpleCommunication/communication/TreeNode:1.0";
  61
  62   /**
  63    * Caches the typecode, allowing to compute it only once.
  64    */
  65   private static TypeCode typeCode;
  66
  67   /**
  68    * This is used to handle the recursive object references in
  69    * CORBA - supported way. The tree TreeNode definition is recursive,
  70    * as the TreeNode contains the sequence of the nodes as its field.
  71    */
  72   private static boolean active;
  73
  74   /**
  75    * Extract the tree TreeNode from the unversal CORBA wrapper, Any.
  76    */
  77   public static TreeNode extract(Any a)
  78   {
  79     return read(a.create_input_stream());
  80   }
  81
  82   /**
  83    * Get the TreeNode string identifer.
  84    */
  85   public static String id()
  86   {
  87     return _id;
  88   }
  89
  90   /**
  91    * Insert the TreeNode into the universal CORBA wrapper, Any.
  92    */
  93   public static void insert(Any a, TreeNode that)
  94   {
  95     OutputStream out = a.create_output_stream();
  96     a.type(type());
  97     write(out, that);
  98     a.read_value(out.create_input_stream(), type());
  99   }
 100
 101   /**
 102    * Read the TreeNode from the common data reprentation (CDR) stream.
 103    */
 104   public static TreeNode read(InputStream istream)
 105   {
 106     TreeNode value = new TreeNode();
 107     value.name = istream.read_string();
 108
 109     int _len0 = istream.read_long();
 110     value.children = new TreeNode[ _len0 ];
 111     for (int i = 0; i < value.children.length; ++i)
 112       value.children [ i ] = TreeNodeHelper.read(istream);
 113     return value;
 114   }
 115
 116   /**
 117    * Get the TreeNode type code definition.
 118    */
 119   public static synchronized TypeCode type()
 120   {
 121     // Compute the type code only once.
 122     if (typeCode == null)
 123       {
 124         synchronized (TypeCode.class)
 125           {
 126             if (typeCode == null)
 127               {
 128                 // To avoid the infinite recursion loop, the
 129                 // recursive reference is handled in specific way.
 130                 if (active)
 131                   return ORB.init().create_recursive_tc(_id);
 132                 active = true;
 133
 134                 // List all memebers of the TreeNode structure.
 135                 StructMember[] members = new StructMember[ 2 ];
 136                 TypeCode memberType;
 137                 memberType = ORB.init().create_string_tc(0);
 138                 members [ 0 ] = new StructMember("name", memberType, null);
 139                 memberType = ORB.init().create_recursive_tc("");
 140                 members [ 1 ] = new StructMember("children", memberType, null);
 141                 typeCode =
 142                   ORB.init().create_struct_tc(TreeNodeHelper.id(), "TreeNode", members);
 143                 active = false;
 144               }
 145           }
 146       }
 147     return typeCode;
 148   }
 149
 150   /**
 151    * Write the TreeNode into the common data reprentation (CDR) stream.
 152    */
 153   public static void write(OutputStream ostream, TreeNode value)
 154   {
 155     ostream.write_string(value.name);
 156     ostream.write_long(value.children.length);
 157     for (int i = 0; i < value.children.length; ++i)
 158       TreeNodeHelper.write(ostream, value.children [ i ]);
 159   }
 160 }