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 testng TestStream
28  */
29 
30 import org.testng.Assert;
31 import org.testng.annotations.Test;
32 
33 import java.lang.invoke.MethodHandles;
34 import jdk.incubator.code.OpTransformer;
35 import jdk.incubator.code.dialect.core.CoreOp;
36 import jdk.incubator.code.interpreter.Interpreter;
37 import java.util.ArrayList;
38 import java.util.List;
39 import java.util.stream.Stream;
40 
41 import static jdk.incubator.code.dialect.java.JavaType.type;
42 
43 public class TestStream {
44 
45     @Test
46     public void testMapFilterForEach() {
47         CoreOp.FuncOp f = StreamFuser.fromList(type(Integer.class))
48                 .map((Integer i) -> i.toString())
49                 .filter((String s) -> s.length() < 10)
50                 .map((String s) -> s.concat("_XXX"))
51                 .filter((String s) -> s.length() < 10)
52                 .forEach((String s) -> System.out.println(s));
53 
54         f.writeTo(System.out);
55 
56         CoreOp.FuncOp lf = f.transform(OpTransformer.LOWERING_TRANSFORMER);
57 
58         lf.writeTo(System.out);
59 
60         Interpreter.invoke(MethodHandles.lookup(), lf,
61                 List.of(List.of(1, 2, 3, 4, 5, 100_000_000, 10_000, 100_000, 20)));
62     }
63 
64     @Test
65     public void testMapFlatMapFilterCollect() {
66         CoreOp.FuncOp f = StreamFuser.fromList(type(Integer.class))
67                 .map((Integer i) -> i.toString())
68                 .flatMap((String s) -> List.of(s, s))
69                 .filter((String s) -> s.length() < 10)
70                 .map((String s) -> s.concat("_XXX"))
71                 .filter((String s) -> s.length() < 10)
72                 .collect(() -> new ArrayList<String>(), (List<String> l, String e) -> l.add(e));
73 
74         f.writeTo(System.out);
75 
76         CoreOp.FuncOp lf = f.transform(OpTransformer.LOWERING_TRANSFORMER);
77 
78         lf.writeTo(System.out);
79 
80         List<Integer> source = List.of(1, 2, 3, 4, 5, 100_000_000, 10_000, 20);
81 
82         List<String> expected = source.stream()
83                 .map(Object::toString)
84                 .flatMap(s -> Stream.of(s, s))
85                 .filter(s -> s.length() < 10)
86                 .map(s -> s.concat("_XXX"))
87                 .filter(s -> s.length() < 10)
88                 .toList();
89 
90         @SuppressWarnings("unchecked")
91         List<String> actual = (List<String>) Interpreter.invoke(MethodHandles.lookup(), lf,
92                 List.of(source));
93 
94         Assert.assertEquals(expected, actual);
95     }
96 }