1 |
781 |
jeremybenn |
/* 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 |
|
|
|
42 |
|
|
import gnu.CORBA.OrbRestricted;
|
43 |
|
|
|
44 |
|
|
import org.omg.CORBA.Any;
|
45 |
|
|
import org.omg.CORBA.StructMember;
|
46 |
|
|
import org.omg.CORBA.TypeCode;
|
47 |
|
|
import org.omg.CORBA.portable.InputStream;
|
48 |
|
|
import org.omg.CORBA.portable.OutputStream;
|
49 |
|
|
|
50 |
|
|
/**
|
51 |
|
|
* This class is used for various helper operations around the
|
52 |
|
|
* tree {@link} structure.
|
53 |
|
|
*
|
54 |
|
|
* @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
|
55 |
|
|
*/
|
56 |
|
|
public abstract class TreeNodeHelper
|
57 |
|
|
{
|
58 |
|
|
/**
|
59 |
|
|
* The TreeNode repository id, used to identify the structure.
|
60 |
|
|
*/
|
61 |
|
|
private static String _id =
|
62 |
|
|
"IDL:gnu/classpath/examples/CORBA/SimpleCommunication/communication/TreeNode:1.0";
|
63 |
|
|
|
64 |
|
|
/**
|
65 |
|
|
* Caches the typecode, allowing to compute it only once.
|
66 |
|
|
*/
|
67 |
|
|
private static TypeCode typeCode;
|
68 |
|
|
|
69 |
|
|
/**
|
70 |
|
|
* This is used to handle the recursive object references in
|
71 |
|
|
* CORBA - supported way. The tree TreeNode definition is recursive,
|
72 |
|
|
* as the TreeNode contains the sequence of the nodes as its field.
|
73 |
|
|
*/
|
74 |
|
|
private static boolean active;
|
75 |
|
|
|
76 |
|
|
/**
|
77 |
|
|
* Extract the tree TreeNode from the unversal CORBA wrapper, Any.
|
78 |
|
|
*/
|
79 |
|
|
public static TreeNode extract(Any a)
|
80 |
|
|
{
|
81 |
|
|
return read(a.create_input_stream());
|
82 |
|
|
}
|
83 |
|
|
|
84 |
|
|
/**
|
85 |
|
|
* Get the TreeNode string identifer.
|
86 |
|
|
*/
|
87 |
|
|
public static String id()
|
88 |
|
|
{
|
89 |
|
|
return _id;
|
90 |
|
|
}
|
91 |
|
|
|
92 |
|
|
/**
|
93 |
|
|
* Insert the TreeNode into the universal CORBA wrapper, Any.
|
94 |
|
|
*/
|
95 |
|
|
public static void insert(Any a, TreeNode that)
|
96 |
|
|
{
|
97 |
|
|
OutputStream out = a.create_output_stream();
|
98 |
|
|
a.type(type());
|
99 |
|
|
write(out, that);
|
100 |
|
|
a.read_value(out.create_input_stream(), type());
|
101 |
|
|
}
|
102 |
|
|
|
103 |
|
|
/**
|
104 |
|
|
* Read the TreeNode from the common data reprentation (CDR) stream.
|
105 |
|
|
*/
|
106 |
|
|
public static TreeNode read(InputStream istream)
|
107 |
|
|
{
|
108 |
|
|
TreeNode value = new TreeNode();
|
109 |
|
|
value.name = istream.read_string();
|
110 |
|
|
|
111 |
|
|
int _len0 = istream.read_long();
|
112 |
|
|
value.children = new TreeNode[ _len0 ];
|
113 |
|
|
for (int i = 0; i < value.children.length; ++i)
|
114 |
|
|
value.children [ i ] = TreeNodeHelper.read(istream);
|
115 |
|
|
return value;
|
116 |
|
|
}
|
117 |
|
|
|
118 |
|
|
/**
|
119 |
|
|
* Get the TreeNode type code definition.
|
120 |
|
|
*/
|
121 |
|
|
public static synchronized TypeCode type()
|
122 |
|
|
{
|
123 |
|
|
// Compute the type code only once.
|
124 |
|
|
if (typeCode == null)
|
125 |
|
|
{
|
126 |
|
|
synchronized (TypeCode.class)
|
127 |
|
|
{
|
128 |
|
|
if (typeCode == null)
|
129 |
|
|
{
|
130 |
|
|
// To avoid the infinite recursion loop, the
|
131 |
|
|
// recursive reference is handled in specific way.
|
132 |
|
|
if (active)
|
133 |
|
|
return OrbRestricted.Singleton.create_recursive_tc(_id);
|
134 |
|
|
active = true;
|
135 |
|
|
|
136 |
|
|
// List all memebers of the TreeNode structure.
|
137 |
|
|
StructMember[] members = new StructMember[ 2 ];
|
138 |
|
|
TypeCode memberType;
|
139 |
|
|
memberType = OrbRestricted.Singleton.create_string_tc(0);
|
140 |
|
|
members [ 0 ] = new StructMember("name", memberType, null);
|
141 |
|
|
memberType = OrbRestricted.Singleton.create_recursive_tc("");
|
142 |
|
|
members [ 1 ] = new StructMember("children", memberType, null);
|
143 |
|
|
typeCode =
|
144 |
|
|
OrbRestricted.Singleton.create_struct_tc(TreeNodeHelper.id(), "TreeNode", members);
|
145 |
|
|
active = false;
|
146 |
|
|
}
|
147 |
|
|
}
|
148 |
|
|
}
|
149 |
|
|
return typeCode;
|
150 |
|
|
}
|
151 |
|
|
|
152 |
|
|
/**
|
153 |
|
|
* Write the TreeNode into the common data reprentation (CDR) stream.
|
154 |
|
|
*/
|
155 |
|
|
public static void write(OutputStream ostream, TreeNode value)
|
156 |
|
|
{
|
157 |
|
|
ostream.write_string(value.name);
|
158 |
|
|
ostream.write_long(value.children.length);
|
159 |
|
|
for (int i = 0; i < value.children.length; ++i)
|
160 |
|
|
TreeNodeHelper.write(ostream, value.children [ i ]);
|
161 |
|
|
}
|
162 |
|
|
}
|