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/*
* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8206986
* @summary Ensure BreakTree.getLabel returns reasonable values
* @modules jdk.compiler
*/
import java.io.StringWriter;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.lang.model.element.Name;
import javax.tools.*;
import com.sun.source.tree.BreakTree;
import com.sun.source.util.JavacTask;
import com.sun.source.util.TreePathScanner;
public class BreakTest {
private static final String CODE =
"public class C {" +
" void t1(Integer i) {" +
" LABEL: switch (i) {" +
" case null: i++; break LABEL;" +
" default: i++; break;" +
" }" +
" }" +
" int t2(Integer i) {" +
" return switch (i) {" +
" case null: break LABEL;" +
" default: yield 2;" +
" }" +
" }" +
"}";
public static void main(String[] args) throws Exception {
final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
String sourceVersion = Integer.toString(Runtime.version().feature());
assert tool != null;
DiagnosticListener<JavaFileObject> noErrors = d -> {};
StringWriter out = new StringWriter();
JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors,
List.of("-XDdev"), null,
Arrays.asList(new MyFileObject(CODE)));
List<String> labels = new ArrayList<>();
new TreePathScanner<Void, Void>() {
@Override
public Void visitBreak(BreakTree node, Void p) {
Name label = node.getLabel();
labels.add(label != null ? label.toString() : null);
return super.visitBreak(node, p);
}
}.scan(ct.parse(), null);
List<String> expected = Arrays.asList("LABEL", null, "LABEL");
if (!expected.equals(labels)) {
throw new AssertionError("Unexpected labels found: " + labels);
}
}
static class MyFileObject extends SimpleJavaFileObject {
private String text;
public MyFileObject(String text) {
super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
this.text = text;
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return text;
}
}
}
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