1/*
2 * Copyright (c) 2011, 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/*
25 * @test
26 * @bug 8003280
27 * @summary Add lambda tests
28 *  basic test for capture of non-mutable locals
29 * @author  Brian Goetz
30 * @author  Maurizio Cimadamore
31 * @run main LambdaCapture02
32 */
33
34public class LambdaCapture02 {
35
36    static int assertionCount = 0;
37
38    static void assertTrue(boolean cond) {
39        assertionCount++;
40        if (!cond)
41            throw new AssertionError();
42    }
43
44    interface Tester {
45        void test();
46    }
47
48    interface TU<T, U> {
49        public T foo(U u);
50    }
51
52    public static <T, U> T exec(TU<T, U> lambda, U x) {
53        return lambda.foo(x);
54    }
55
56    public Integer n = 5;
57
58    //Simple local capture
59    void test1() {
60        final Integer N = 1;
61        int res = LambdaCapture02.<Integer,Integer>exec((Integer x) -> x + N, 3);
62        assertTrue(4 == res);
63    }
64
65    //Local capture with multiple scopes (anon class)
66    void test2() {
67        final Integer N = 1;
68        new Tester() {
69            public void test() {
70                final Integer M = 2;
71                int res = LambdaCapture02.<Integer,Integer>exec((Integer x) -> x + N + M, 3);
72                assertTrue(6 == res);
73            }
74        }.test();
75    }
76
77    //Local capture with multiple scopes (local class)
78    void test3() {
79        final Integer N = 1;
80        class MyTester implements Tester {
81            public void test() {
82                final Integer M = 2;
83                int res = LambdaCapture02.<Integer,Integer>exec((Integer x) -> x + N + M, 3);
84                assertTrue(6 == res);
85            }
86        }
87        new MyTester().test();
88    }
89
90    //access to field from enclosing scope
91    void test4() {
92        final Integer N = 4;
93        int res1 = LambdaCapture02.<Integer,Integer>exec((Integer x) -> x + n + N, 3);
94        assertTrue(12 == res1);
95        int res2 = LambdaCapture02.<Integer,Integer>exec((Integer x) -> x + LambdaCapture02.this.n + N, 3);
96        assertTrue(12 == res2);
97    }
98
99    public static void main(String[] args) {
100        LambdaCapture02 t = new LambdaCapture02();
101        t.test1();
102        t.test2();
103        t.test3();
104        t.test4();
105        assertTrue(assertionCount == 5);
106    }
107}
108