LambdaFormTest.java revision 10004:7d144f6951bc 
1/*
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/* @test
25 * @summary unit tests for java.lang.invoke.LambdaForm
26 * @run junit/othervm test.java.lang.invoke.LambdaFormTest
27 */
28package test.java.lang.invoke;
29
30import org.junit.Test;
31import java.lang.reflect.Method;
32import static org.junit.Assert.*;
33
34public class LambdaFormTest {
35    static final Method M_shortenSignature;
36    static {
37        try {
38            Class<?> impl = Class.forName("java.lang.invoke.LambdaForm", false, null);
39            Method m = impl.getDeclaredMethod("shortenSignature", String.class);
40            m.setAccessible(true);
41            M_shortenSignature = m;
42        } catch(Exception e) {
43            throw new AssertionError(e);
44        }
45    }
46
47    public static String shortenSignature(String signature) throws ReflectiveOperationException {
48        return (String)M_shortenSignature.invoke(null, signature);
49    }
50
51    @Test
52    public void testShortenSignature() throws ReflectiveOperationException {
53        for (String s : new String[] {
54                // invariant strings:
55                "L", "LL", "ILL", "LIL", "LLI", "IILL", "ILIL", "ILLI",
56                // a few mappings:
57                "LLL=L3", "LLLL=L4", "LLLLLLLLLL=L10",
58                "IIIDDD=I3D3", "IDDD=ID3", "IIDDD=IID3", "IIID=I3D", "IIIDD=I3DD"
59            }) {
60            String s2 = s.substring(s.indexOf('=')+1);
61            String s1 = s.equals(s2) ? s : s.substring(0, s.length() - s2.length() - 1);
62            // mix the above cases with before and after reps of Z*
63            for (int k = -3; k <= 3; k++) {
64                String beg = (k < 0 ? "ZZZZ".substring(-k) : "");
65                String end = (k > 0 ? "ZZZZ".substring(+k) : "");
66                String ks1 = beg+s1+end;
67                String ks2 = shortenSignature(beg)+s2+shortenSignature(end);
68                String ks3 = shortenSignature(ks1);
69                assertEquals(ks2, ks3);
70            }
71        }
72    }
73
74    public static void main(String[] args) throws ReflectiveOperationException {
75        LambdaFormTest test = new LambdaFormTest();
76        test.testShortenSignature();
77    }
78}
79