1 /*
2 * Copyright (c) 2018, 2019, 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 * @bug 8206986
27 * @summary Ensure CaseTree methods return expected values
28 * @modules jdk.compiler
29 */
30
31 import java.io.IOException;
32 import java.io.StringWriter;
33 import java.net.URI;
34 import java.util.ArrayList;
35 import java.util.Arrays;
36 import java.util.List;
37 import java.util.stream.Collectors;
38
39 import javax.tools.*;
40
41 import com.sun.source.tree.CaseTree;
42 import com.sun.source.tree.CompilationUnitTree;
43 import com.sun.source.tree.Tree;
44 import com.sun.source.util.JavacTask;
45 import com.sun.source.util.TreePathScanner;
46
47 public class CaseTest {
48
49 public static void main(String[] args) throws Exception {
50 String sourceVersion = Integer.toString(Runtime.version().feature());
51 new CaseTest().testLabels(sourceVersion);
52 new CaseTest().testStatement(sourceVersion);
53 new CaseTest().testRule(sourceVersion);
54 }
55
56 void testLabels(String sourceVersion) throws Exception {
57 String code = "class Test {\n" +
58 " void t(int i) {\n" +
59 " switch(i) {\n" +
60 " case 0: break;\n" +
61 " case 1, 2: breal;\n" +
62 " default: breal;\n" +
63 " }\n" +
64 " }\n" +
65 "}\n";
66 List<String> labels = new ArrayList<>();
67 new TreePathScanner<Void, Void>() {
68 @Override
69 public Void visitCase(CaseTree node, Void p) {
70 labels.add(String.valueOf(node.getExpression()));
71 labels.add(node.getExpressions().stream()
72 .map(String::valueOf)
73 .collect(Collectors.joining(",", "[", "]")));
74 return super.visitCase(node, p);
75 }
76 }.scan(parse(code, sourceVersion), null);
77
78 List<String> expected = Arrays.asList("0", "[0]", "1", "[1,2]", "null", "[]");
79
80 if (!expected.equals(labels)) {
81 throw new AssertionError("Unexpected labels found: " + labels);
82 }
83 }
84
85 void testStatement(String sourceVersion) throws Exception {
86 String code = "class Test {\n" +
87 " void t(int i) {\n" +
88 " switch(i) {\n" +
89 " case 0:" +
90 " System.err.println();\n" +
91 " break;\n" +
92 " }\n" +
93 " }\n" +
94 "}\n";
95 new TreePathScanner<Void, Void>() {
96 @Override
97 public Void visitCase(CaseTree node, Void p) {
98 if (node.getStatements().size() != 2) {
99 throw new AssertionError("Unexpected statements: " + node.getStatements());
100 }
101 if (node.getBody() != null) {
102 throw new AssertionError("Unexpected body: " + node.getBody());
103 }
104 return super.visitCase(node, p);
105 }
106 }.scan(parse(code, sourceVersion), null);
107 }
108
109 void testRule(String sourceVersion) throws Exception {
110 String code = "class Test {\n" +
111 " void t(int i) {\n" +
112 " switch(i) {\n" +
113 " case 0 -> {" +
114 " System.err.println();\n" +
115 " };\n" +
116 " }\n" +
117 " }\n" +
118 "}\n";
119 new TreePathScanner<Void, Void>() {
120 @Override
121 public Void visitCase(CaseTree node, Void p) {
122 if (node.getStatements() != null) {
123 throw new AssertionError("Unexpected statements: " + node.getStatements());
124 }
125 if (node.getBody().getKind() != Tree.Kind.BLOCK) {
126 throw new AssertionError("Unexpected body: " + node.getBody());
127 }
128 return super.visitCase(node, p);
129 }
130 }.scan(parse(code, sourceVersion), null);
131 }
132
133 private CompilationUnitTree parse(String code, String sourceVersion) throws IOException {
134 final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
135 assert tool != null;
136 DiagnosticListener<JavaFileObject> noErrors = d -> {};
137
138 StringWriter out = new StringWriter();
139 JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors,
140 List.of("-XDdev", "--enable-preview", "-source", sourceVersion), null,
141 Arrays.asList(new MyFileObject(code)));
142 return ct.parse().iterator().next();
143 }
144
145 static class MyFileObject extends SimpleJavaFileObject {
146 private String text;
147
148 public MyFileObject(String text) {
149 super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
150 this.text = text;
151 }
152
153 @Override
154 public CharSequence getCharContent(boolean ignoreEncodingErrors) {
155 return text;
156 }
157 }
158 }