1 /*
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 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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
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20  * or visit www.oracle.com if you need additional information or have any
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22  */
23 
24 /*
25  * @test
26  * @summary Smoke test for captured values in quoted lambdas.
27  * @run testng TestCaptureQuoted
28  */
29 
30 import java.lang.reflect.code.op.CoreOp.Var;
31 import java.lang.reflect.code.Op;
32 import java.lang.reflect.code.Quoted;
33 import java.lang.reflect.code.interpreter.Interpreter;
34 import java.lang.invoke.MethodHandles;
35 import java.util.stream.IntStream;
36 
37 import org.testng.annotations.*;
38 import static org.testng.Assert.*;
39 
40 public class TestCaptureQuoted {
41 
42     @Test(dataProvider = "ints")
43     public void testCaptureIntParam(int x) {
44         Quoted quoted = (int y) -> x + y;
45         assertEquals(quoted.capturedValues().size(), 1);
46         assertEquals(((Var)quoted.capturedValues().values().iterator().next()).value(), x);
47         int res = (int)Interpreter.invoke(MethodHandles.lookup(), (Op & Op.Invokable) quoted.op(),
48                 quoted.capturedValues(), 1);
49         assertEquals(res, x + 1);
50     }
51 
52     @Test(dataProvider = "ints")
53     public void testCaptureIntField(int x) {
54         class Context {
55             final int x;
56 
57             Context(int x) {
58                 this.x = x;
59             }
60 
61             Quoted quoted() {
62                 return (int y) -> x + y;
63             }
64         }
65         Context context = new Context(x);
66         Quoted quoted = context.quoted();
67         assertEquals(quoted.capturedValues().size(), 1);
68         assertEquals(quoted.capturedValues().values().iterator().next(), context);
69         int res = (int)Interpreter.invoke(MethodHandles.lookup(), (Op & Op.Invokable) quoted.op(),
70                 quoted.capturedValues(), 1);
71         assertEquals(res, x + 1);
72     }
73 
74     @DataProvider(name = "ints")
75     public Object[][] ints() {
76         return IntStream.range(0, 50)
77                 .mapToObj(i -> new Object[] { i })
78                 .toArray(Object[][]::new);
79     }
80 }