1 /*
   2  * Copyright 2004 Sun Microsystems, Inc.  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.  Sun designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  22  * CA 95054 USA or visit www.sun.com if you need additional information or
  23  * have any questions.
  24  */
  25 
  26 package com.sun.mirror.type;
  27 
  28 
  29 import java.util.Collection;
  30 
  31 
  32 /**
  33  * Represents a wildcard type argument.
  34  * Examples include:    <pre><tt>
  35  *   ?
  36  *   ? extends Number
  37  *   ? super T
  38  * </tt></pre>
  39  *
  40  * <p> A wildcard may have its upper bound explicitly set by an
  41  * <tt>extends</tt> clause, its lower bound explicitly set by a
  42  * <tt>super</tt> clause, or neither (but not both).
  43  *
  44  * @author Joseph D. Darcy
  45  * @author Scott Seligman
  46  * @since 1.5
  47  */
  48 
  49 public interface WildcardType extends TypeMirror {
  50 
  51     /**
  52      * Returns the upper bounds of this wildcard.
  53      * If no upper bound is explicitly declared, then
  54      * an empty collection is returned.
  55      *
  56      * @return the upper bounds of this wildcard
  57      */
  58     Collection<ReferenceType> getUpperBounds();
  59 
  60     /**
  61      * Returns the lower bounds of this wildcard.
  62      * If no lower bound is explicitly declared, then
  63      * an empty collection is returned.
  64      *
  65      * @return the lower bounds of this wildcard
  66      */
  67     Collection<ReferenceType> getLowerBounds();
  68 }