Java example source code file (Wildcard.java)

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Java - Java tags/keywords

fieldtypesignature, typeargument, wildcard

The Wildcard.java Java example source code

/*
 * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * 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.
 *
 * 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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.reflect.generics.tree;

import sun.reflect.generics.visitor.TypeTreeVisitor;

public class Wildcard implements TypeArgument {
    private FieldTypeSignature[] upperBounds;
    private FieldTypeSignature[] lowerBounds;

    private Wildcard(FieldTypeSignature[] ubs, FieldTypeSignature[] lbs) {
        upperBounds = ubs;
        lowerBounds = lbs;
    }

    private static final FieldTypeSignature[] emptyBounds = new FieldTypeSignature[0];

    public static Wildcard make(FieldTypeSignature[] ubs,
                                FieldTypeSignature[] lbs) {
        return new Wildcard(ubs, lbs);
    }

    public FieldTypeSignature[] getUpperBounds(){
        return upperBounds;
    }

    public FieldTypeSignature[] getLowerBounds(){
        if (lowerBounds.length == 1 &&
            lowerBounds[0] == BottomSignature.make())
            return emptyBounds;
        else
            return lowerBounds;
    }

    public void accept(TypeTreeVisitor<?> v){v.visitWildcard(this);}
}