WildcardType.java revision 3870:f5dc63258a43 
1/*
2 * Copyright (c) 2005, 2006, 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
18 * 2 along with this work; if not, write to the Free Software Foundation,
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
23 * questions.
24 */
25
26package javax.lang.model.type;
27
28
29/**
30 * Represents a wildcard type argument.
31 * Examples include:    <pre><code>
32 *   ?
33 *   ? extends Number
34 *   ? super T
35 * </code></pre>
36 *
37 * <p> A wildcard may have its upper bound explicitly set by an
38 * {@code extends} clause, its lower bound explicitly set by a
39 * {@code super} clause, or neither (but not both).
40 *
41 * @author Joseph D. Darcy
42 * @author Scott Seligman
43 * @author Peter von der Ah&eacute;
44 * @since 1.6
45 */
46public interface WildcardType extends TypeMirror {
47
48    /**
49     * Returns the upper bound of this wildcard.
50     * If no upper bound is explicitly declared,
51     * {@code null} is returned.
52     *
53     * @return the upper bound of this wildcard
54     */
55    TypeMirror getExtendsBound();
56
57    /**
58     * Returns the lower bound of this wildcard.
59     * If no lower bound is explicitly declared,
60     * {@code null} is returned.
61     *
62     * @return the lower bound of this wildcard
63     */
64    TypeMirror getSuperBound();
65}
66