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/*
 * @(#)WildcardType.java  1.5 04/06/07
 *
 * Copyright (c) 2004, Sun Microsystems, Inc.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Sun Microsystems, Inc. nor the names of
 *       its contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.sun.mirror.type;


import java.util.Collection;


/**
 * Represents a wildcard type argument.
 * Examples include:  <pre><tt>
 *   ?
 *   ? extends Number
 *   ? super T
 * </tt></pre>
 *
 * <p> A wildcard may have its upper bound explicitly set by an
 * <tt>extends</tt> clause, its lower bound explicitly set by a
 * <tt>super</tt> clause, or neither (but not both).
 *
 * @author Joseph D. Darcy
 * @author Scott Seligman
 * @version 1.5 04/06/07
 * @since 1.5
 */

public interface WildcardType extends TypeMirror {

    /**
     * Returns the upper bounds of this wildcard.
     * If no upper bound is explicitly declared, then
     * an empty collection is returned.
     *
     * @return the upper bounds of this wildcard
     */
    Collection<ReferenceType> getUpperBounds();

    /**
     * Returns the lower bounds of this wildcard.
     * If no lower bound is explicitly declared, then
     * an empty collection is returned.
     *
     * @return the lower bounds of this wildcard
     */
    Collection<ReferenceType> getLowerBounds();
}
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