1 /*
 2  * Copyright (c) 2024, 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  * @modules jdk.incubator.code
27  * @run junit TestStream
28  */
29 
30 import jdk.incubator.code.CodeTransformer;
31 import jdk.incubator.code.Reflect;
32 import jdk.incubator.code.dialect.core.CoreOp;
33 import jdk.incubator.code.interpreter.Interpreter;
34 import org.junit.jupiter.api.Assertions;
35 import org.junit.jupiter.api.Test;
36 
37 import java.lang.invoke.MethodHandles;
38 import java.util.ArrayList;
39 import java.util.List;
40 import java.util.stream.Stream;
41 
42 public class TestStream {
43 
44     @Test
45     public void testMapFilterForEach() {
46         @Reflect
47         CoreOp.FuncOp f = StreamFuser.fromList(Integer.class)
48                 .map(Object::toString)
49                 .filter(s -> s.length() < 10)
50                 .map(s -> s.concat("_XXX"))
51                 .filter(s -> s.length() < 10)
52                 // Cannot use method reference since it captures the result of the expression "System.out"
53                 .forEach(s -> System.out.println(s));
54 
55         System.out.println(f.toText());
56 
57         CoreOp.FuncOp lf = f.transform(CodeTransformer.LOWERING_TRANSFORMER);
58 
59         System.out.println(lf.toText());
60 
61         Interpreter.invoke(MethodHandles.lookup(), lf,
62                 List.of(List.of(1, 2, 3, 4, 5, 100_000_000, 10_000, 100_000, 20)));
63     }
64 
65     @Test
66     public void testMapFlatMapFilterCollect() {
67         @Reflect
68         CoreOp.FuncOp f = StreamFuser.fromList(Integer.class)
69                 .map(Object::toString)
70                 .flatMap(s -> List.of(s, s))
71                 .filter(s -> s.length() < 10)
72                 .map(s -> s.concat("_XXX"))
73                 .filter(s -> s.length() < 10)
74                 .collect(ArrayList::new, ArrayList::add);
75 
76         System.out.println(f.toText());
77 
78         CoreOp.FuncOp lf = f.transform(CodeTransformer.LOWERING_TRANSFORMER);
79 
80         System.out.println(lf.toText());
81 
82         List<Integer> source = List.of(1, 2, 3, 4, 5, 100_000_000, 10_000, 20);
83 
84         List<String> expected = source.stream()
85                 .map(Object::toString)
86                 .flatMap(s -> Stream.of(s, s))
87                 .filter(s -> s.length() < 10)
88                 .map(s -> s.concat("_XXX"))
89                 .filter(s -> s.length() < 10)
90                 .toList();
91 
92         @SuppressWarnings("unchecked")
93         List<String> actual = (List<String>) Interpreter.invoke(MethodHandles.lookup(), lf,
94                 List.of(source));
95 
96         Assertions.assertEquals(actual, expected);
97     }
98 }