/*

 * Copyright 2003 Sun Microsystems, Inc.  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.

 *

 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/*

 * @test

 * @bug 4916607

 * @summary Test casts (legal, warning, and errors)

 * @author gafter

 *

 */

import java.util.*;

class CastTest {

    // --- Directly transferring parameters ---

    private class AA<T> { }

    private class AB<T> extends AA<T> { }

    private class AC<T> extends AA<Vector<T>> { }

    private class AD<T> extends AA<Vector<? extends T>> { }

    private class AE<T> extends AA<Vector<? super T>> { }

    private class AF<T> extends AA<T[]> { }

    private class AG<T> extends AA<String> { }

    private void parameterTransfer() {

        Object o;

        o = (AB<String>) (AA<String>) null; // <<pass>>

        o = (AB<String>) (AA<Number>) null; // <<fail 1>>

        o = (AC<String>) (AA<Vector<String>>) null; // <<pass>>

        o = (AC<String>) (AA<Vector<Number>>) null; // <<fail 2>>

        o = (AC<String>) (AA<Stack<String>>) null; // <<fail 3>>

        o = (AD<Number>) (AA<Vector<? extends Number>>) null; // <<pass>>

        o = (AD<String>) (AA<Vector<? extends Number>>) null; // <<fail 4>>

        o = (AD<?>) (AA<Vector<? extends Object>>) null; // <<pass>>

        o = (AD<Object>) (AA<Vector<?>>) null; // <<pass>>

        o = (AE<String>) (AA<Vector<? super String>>) null; // <<pass>>

        o = (AE<Number>) (AA<Vector<? super String>>) null; // <<fail 5>>

        o = (AF<String>) (AA<String[]>) null; // <<pass>>

        o = (AF<String>) (AA<Number[]>) null; // <<fail 6>>

        o = (AG<?>) (AA<String>) null; // <<pass>>

        o = (AG<?>) (AA<Number>) null; // <<fail 7>>

    }

    // --- Inconsistent matches ---

    private class BA<T> { }

    private class BB<T, S> { }

    private class BC<T> extends BA<Integer> { }

    private class BD<T> extends BB<T, T> { }

    private void inconsistentMatches() {

        Object o;

        o = (BC<?>) (BA<Integer>) null; // <<pass>>

        o = (BC<?>) (BA<String>) null; // <<fail 8>>

        o = (BD<String>) (BB<String, String>) null; // <<pass>>

        o = (BD<String>) (BB<String, Number>) null; // <<fail 9>>

        o = (BD<String>) (BB<Number, String>) null; // <<fail 10>>

    }

    private void whyMustEverythingBeSo_______Complicated() {

        // This has to work...

        BD<Number> bd = new BD<Number>();

        BB<? extends Number, ? super Integer> bb = bd;

        // 4916620: wildcards: legal cast is rejected

        // bd = (BD<Number>) bb; // <<warn>> <<todo: cast-infer>>

    }

    // --- Transferring parameters via supertypes ---

    private interface CA<T> { }

    private interface CB<T> extends CA<T> { }

    private interface CC<T> extends CA<T> { }

    private class CD<T> implements CB<T> { }

    private interface CE<T> extends CC<T> { }

    private interface CF<S> { }

    private interface CG<T> { }

    private class CH<S, T> implements CF<S>, CG<T> { }

    private interface CI<S> extends CF<S> { }

    private interface CJ<T> extends CG<T> { }

    private interface CK<S, T> extends CI<S>, CJ<T> { }

    private void supertypeParameterTransfer() {

        Object o;

        CD<?> cd = (CE<?>) null; // <<fail 11>>

        CE<?> ce = (CD<?>) null; // <<fail 12>>

        o = (CE<String>) (CD<String>) null; // <<pass>>

        o = (CE<Number>) (CD<String>) null; // <<fail 13>>

        // 4916622: unnecessary warning with cast

        // o = (CH<String, Integer>) (CK<String, Integer>) null; // <<pass>> <<todo: cast-infer>>

    }

    // --- Disjoint ---

    private interface DA<T> { }

    private interface DB<T> extends DA<T> { }

    private interface DC<T> extends DA<Integer> { }

    private <N extends Number, I extends Integer, R extends Runnable, S extends String> void disjointness() {

        Object o;

        // Classes

        o = (DA<Number>) (DA<Integer>) null; // <<fail 14>>

        o = (DA<? extends Number>) (DA<Integer>) null; // <<pass>>

        o = (DA<? extends Integer>) (DA<Number>) null; // <<fail 15>>

        o = (DA<? super Integer>) (DA<Number>) null; // <<pass>>

        o = (DA<? super Number>) (DA<Integer>) null; // <<fail 16>>

        o = (DA<?>) (DA<Integer>) null; // <<pass>>

        o = (DA<? extends Runnable>) (DA<? extends Number>) null; // <<warn 2>>

        o = (DA<? extends Runnable>) (DA<? extends String>) null; // <<fail 17>>

        o = (DA<? super Integer>) (DA<? extends Number>) null; // <<warn 3>>

        o = (DA<? super Number>) (DA<? extends Integer>) null; // <<fail 18>>

        o = (DA<?>) (DA<? extends Integer>) null; // <<pass>>

        o = (DA<? super String>) (DA<? super Number>) null; // <<warn 4>>

        o = (DA<?>) (DA<? super String>) null; // <<pass>>

        o = (DA<?>) (DA<?>) null; // <<pass>>

        // Typevars

        o = (DA<? extends Number>) (DA<I>) null; // <<pass>>

        o = (DA<? extends Integer>) (DA<N>) null; // <<warn 5>>

        o = (DA<? extends String>) (DA<I>) null; // <<fail 19>>

        o = (DA<I>) (DA<? extends Number>) null; // <<warn 6>>

        o = (DA<N>) (DA<? extends Integer>) null; // <<warn 7>>

        o = (DA<N>) (DA<? extends Runnable>) null; // <<warn 8>>

        o = (DA<N>) (DA<I>) null; // <<warn 9>>

        o = (DA<N>) (DA<R>) null; // <<warn 10>>

        o = (DA<S>) (DA<R>) null; // <<fail 20>>

        // Raw (asymmetrical!)

        o = (DA) (DB<Number>) null; // <<pass>>

        o = (DA<Number>) (DB) null; // <<warn 11>>

        o = (DA<?>) (DB) null; // <<pass>>

        o = (DA<? extends Object>) (DB) null; // <<pass>>

        o = (DA<? extends Number>) (DB) null; // <<warn 12>>

        o = (DB) (DA<Number>) null; // <<pass>>

        o = (DB<Number>) (DA) null; // <<warn 13>>

        o = (DB<?>) (DA) null; // <<pass>>

        o = (DB<? extends Object>) (DA) null; // <<pass>>

        o = (DB<? extends Number>) (DA) null; // <<warn 14>>

        o = (DC<?>) (DA<?>) null; // <<pass>>

        o = (DC<?>) (DA<? super String>) null; // <<fail 21>>

    }

}