/*

 * Copyright (c) 2014, 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.

 *

 * 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.

 */

/* @test

 * @summary unit tests for java.lang.invoke.LambdaForm

 * @modules java.base/java.lang.invoke:open

 * @run junit/othervm test.java.lang.invoke.LambdaFormTest

 */

package test.java.lang.invoke;

import org.junit.Test;

import java.lang.reflect.Method;

import static org.junit.Assert.*;

public class LambdaFormTest {

    static final Method M_shortenSignature;

    static {

        try {

            Class<?> impl = Class.forName("java.lang.invoke.LambdaForm", false, null);

            Method m = impl.getDeclaredMethod("shortenSignature", String.class);

            m.setAccessible(true);

            M_shortenSignature = m;

        } catch(Exception e) {

            throw new AssertionError(e);

        }

    }

    public static String shortenSignature(String signature) throws ReflectiveOperationException {

        return (String)M_shortenSignature.invoke(null, signature);

    }

    @Test

    public void testShortenSignature() throws ReflectiveOperationException {

        for (String s : new String[] {

                // invariant strings:

                "L", "LL", "ILL", "LIL", "LLI", "IILL", "ILIL", "ILLI",

                // a few mappings:

                "LLL=L3", "LLLL=L4", "LLLLLLLLLL=L10",

                "IIIDDD=I3D3", "IDDD=ID3", "IIDDD=IID3", "IIID=I3D", "IIIDD=I3DD"

            }) {

            String s2 = s.substring(s.indexOf('=')+1);

            String s1 = s.equals(s2) ? s : s.substring(0, s.length() - s2.length() - 1);

            // mix the above cases with before and after reps of Z*

            for (int k = -3; k <= 3; k++) {

                String beg = (k < 0 ? "ZZZZ".substring(-k) : "");

                String end = (k > 0 ? "ZZZZ".substring(+k) : "");

                String ks1 = beg+s1+end;

                String ks2 = shortenSignature(beg)+s2+shortenSignature(end);

                String ks3 = shortenSignature(ks1);

                assertEquals(ks2, ks3);

            }

        }

    }

    public static void main(String[] args) throws ReflectiveOperationException {

        LambdaFormTest test = new LambdaFormTest();

        test.testShortenSignature();

    }

}