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  * @run testng TestStream
27  */
28 
29 import org.testng.Assert;
30 import org.testng.annotations.Test;
31 
32 import java.lang.reflect.code.OpTransformer;
33 import java.lang.reflect.code.op.CoreOp;
34 import java.lang.reflect.code.Op;
35 import java.lang.reflect.code.interpreter.Interpreter;
36 import java.util.ArrayList;
37 import java.util.List;
38 import java.util.stream.Stream;
39 
40 import static java.lang.reflect.code.type.JavaType.type;
41 
42 public class TestStream {
43 
44     @Test
45     public void testMapFilterForEach() {
46         CoreOp.FuncOp f = StreamFuser.fromList(type(Integer.class))
47                 .map((Integer i) -> i.toString())
48                 .filter((String s) -> s.length() < 10)
49                 .map((String s) -> s.concat("_XXX"))
50                 .filter((String s) -> s.length() < 10)
51                 .forEach((String s) -> System.out.println(s));
52 
53         f.writeTo(System.out);
54 
55         CoreOp.FuncOp lf = f.transform(OpTransformer.LOWERING_TRANSFORMER);
56 
57         lf.writeTo(System.out);
58 
59         Interpreter.invoke(lf, List.of(List.of(1, 2, 3, 4, 5, 100_000_000, 10_000, 100_000, 20)));
60     }
61 
62     @Test
63     public void testMapFlatMapFilterCollect() {
64         CoreOp.FuncOp f = StreamFuser.fromList(type(Integer.class))
65                 .map((Integer i) -> i.toString())
66                 .flatMap((String s) -> List.of(s, s))
67                 .filter((String s) -> s.length() < 10)
68                 .map((String s) -> s.concat("_XXX"))
69                 .filter((String s) -> s.length() < 10)
70                 .collect(() -> new ArrayList<String>(), (List<String> l, String e) -> l.add(e));
71 
72         f.writeTo(System.out);
73 
74         CoreOp.FuncOp lf = f.transform(OpTransformer.LOWERING_TRANSFORMER);
75 
76         lf.writeTo(System.out);
77 
78         List<Integer> source = List.of(1, 2, 3, 4, 5, 100_000_000, 10_000, 20);
79 
80         List<String> expected = source.stream()
81                 .map(Object::toString)
82                 .flatMap(s -> Stream.of(s, s))
83                 .filter(s -> s.length() < 10)
84                 .map(s -> s.concat("_XXX"))
85                 .filter(s -> s.length() < 10)
86                 .toList();
87 
88         @SuppressWarnings("unchecked")
89         List<String> actual = (List<String>) Interpreter.invoke(lf, List.of(source));
90 
91         Assert.assertEquals(expected, actual);
92     }
93 }