src/java.compiler/share/classes/javax/lang/model/type/WildcardType.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
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package javax.lang.model.type;


/**
 * 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
 * {@code extends} clause, its lower bound explicitly set by a
 * {@code super} clause, or neither (but not both).
 *
 * @author Joseph D. Darcy
 * @author Scott Seligman
 * @author Peter von der Ah&eacute;
 * @since 1.6
 */
public interface WildcardType extends TypeMirror {

    /**
     * Returns the upper bound of this wildcard.
     * If no upper bound is explicitly declared,
     * {@code null} is returned.
     *
     * @return the upper bound of this wildcard
     */
    TypeMirror getExtendsBound();

    /**
     * Returns the lower bound of this wildcard.
     * If no lower bound is explicitly declared,
     * {@code null} is returned.
     *
     * @return the lower bound of this wildcard
     */
    TypeMirror getSuperBound();
}