1 /*
2 * Copyright (c) 1996, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
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24 */
25
26 package org.omg.CORBA;
27
28 /**
29 * A modifiable list containing <code>NamedValue</code> objects.
30 * <P>
31 * The class <code>NVList</code> is used as follows:
32 * <UL>
33 * <LI>to describe arguments for a <code>Request</code> object
34 * in the Dynamic Invocation Interface and
35 * the Dynamic Skeleton Interface
36 * <LI>to describe context values in a <code>Context</code> object
37 * </UL>
38 * <P>
39 * Each <code>NamedValue</code> object consists of the following:
40 * <UL>
41 * <LI>a name, which is a <code>String</code> object
42 * <LI>a value, as an <code>Any</code> object
43 * <LI>an argument mode flag
44 * </UL>
45 * <P>
46 * An <code>NVList</code> object
47 * may be created using one of the following
48 * <code>ORB</code> methods:
49 * <OL>
50 * <LI><code>org.omg.CORBA.ORB.create_list</code>
51 * <PRE>
52 * org.omg.CORBA.NVList nv = orb.create_list(3);
53 * </PRE>
54 * The variable <code>nv</code> represents a newly-created
55 * <code>NVList</code> object. The argument is a memory-management
56 * hint to the orb and does not imply the actual length of the list.
57 * If, for example, you want to use an <code>NVList</code> object
58 * in a request, and the method being invoked takes three parameters,
59 * you might optimize by supplying 3 to the method
60 * <code>create_list</code>. Note that the new <code>NVList</code>
61 * will not necessarily have a length of 3; it
62 * could have a length of 2 or 4, for instance.
63 * Note also that you can add any number of
64 * <code>NamedValue</code> objects to this list regardless of
65 * its original length.
66 * <LI><code>org.omg.CORBA.ORB.create_operation_list</code>
67 * <PRE>
68 * org.omg.CORBA.NVList nv = orb.create_operation_list(myOperationDef);
69 * </PRE>
70 * The variable <code>nv</code> represents a newly-created
71 * <code>NVList</code> object that contains descriptions of the
72 * arguments to the method described in the given
73 * <code>OperationDef</code> object.
74 * </OL>
75 * <P>
76 * The methods in the class <code>NVList</code> all deal with
77 * the <code>NamedValue</code> objects in the list.
78 * There are three methods for adding a <code>NamedValue</code> object,
79 * a method for getting the count of <code>NamedValue</code> objects in
80 * the list, a method for retrieving a <code>NamedValue</code> object
81 * at a given index, and a method for removing a <code>NamedValue</code> object
82 * at a given index.
83 *
84 * @see org.omg.CORBA.Request
85 * @see org.omg.CORBA.ServerRequest
86 * @see org.omg.CORBA.NamedValue
87 * @see org.omg.CORBA.Context
88 *
89 * @since JDK1.2
90 */
91
92 public abstract class NVList {
93
94 /**
95 * Returns the number of <code>NamedValue</code> objects that have
96 * been added to this <code>NVList</code> object.
97 *
98 * @return an <code>int</code> indicating the number of
99 * <code>NamedValue</code> objects in this <code>NVList</code>.
100 */
101
102 public abstract int count();
103
104 /**
105 * Creates a new <code>NamedValue</code> object initialized with the given flag
106 * and adds it to the end of this <code>NVList</code> object.
107 * The flag can be any one of the argument passing modes:
108 * <code>ARG_IN.value</code>, <code>ARG_OUT.value</code>, or
109 * <code>ARG_INOUT.value</code>.
110 *
111 * @param flags one of the argument mode flags
112 * @return the newly-created <code>NamedValue</code> object
113 */
114
115 public abstract NamedValue add(int flags);
116
117 /**
118 * Creates a new <code>NamedValue</code> object initialized with the
119 * given name and flag,
120 * and adds it to the end of this <code>NVList</code> object.
121 * The flag can be any one of the argument passing modes:
122 * <code>ARG_IN.value</code>, <code>ARG_OUT.value</code>, or
123 * <code>ARG_INOUT.value</code>.
124 *
125 * @param item_name the name for the new <code>NamedValue</code> object
126 * @param flags one of the argument mode flags
127 * @return the newly-created <code>NamedValue</code> object
128 */
129
130 public abstract NamedValue add_item(String item_name, int flags);
131
132 /**
133 * Creates a new <code>NamedValue</code> object initialized with the
134 * given name, value, and flag,
135 * and adds it to the end of this <code>NVList</code> object.
136 *
137 * @param item_name the name for the new <code>NamedValue</code> object
138 * @param val an <code>Any</code> object containing the value
139 * for the new <code>NamedValue</code> object
140 * @param flags one of the following argument passing modes:
141 * <code>ARG_IN.value</code>, <code>ARG_OUT.value</code>, or
142 * <code>ARG_INOUT.value</code>
143 * @return the newly created <code>NamedValue</code> object
144 */
145
146 public abstract NamedValue add_value(String item_name, Any val, int flags);
147
148 /**
149 * Retrieves the <code>NamedValue</code> object at the given index.
150 *
151 * @param index the index of the desired <code>NamedValue</code> object,
152 * which must be between zero and the length of the list
153 * minus one, inclusive. The first item is at index zero.
154 * @return the <code>NamedValue</code> object at the given index
155 * @exception org.omg.CORBA.Bounds if the index is greater than
156 * or equal to number of <code>NamedValue</code> objects
157 */
158
159 public abstract NamedValue item(int index) throws org.omg.CORBA.Bounds;
160
161 /**
162 * Removes the <code>NamedValue</code> object at the given index.
163 * Note that the indices of all <code>NamedValue</code> objects following
164 * the one removed are shifted down by one.
165 *
166 * @param index the index of the <code>NamedValue</code> object to be
167 * removed, which must be between zero and the length
168 * of the list minus one, inclusive.
169 * The first item is at index zero.
170 * @exception org.omg.CORBA.Bounds if the index is greater than
171 * or equal to number of <code>NamedValue</code> objects in
172 * the list
173 */
174
175 public abstract void remove(int index) throws org.omg.CORBA.Bounds;
176
177 }