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