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 
  26 package 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  */
  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 }