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1   /*
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3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5    * This code is free software; you can redistribute it and/or modify it
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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.
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24   */
25  
26  package javax.lang.model.type;
27  
28  
29  /**
30   * Represents a wildcard type argument.
31   * Examples include:    <pre><tt>
32   *   ?
33   *   ? extends Number
34   *   ? super T
35   * </tt></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   */
46  public 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  }