/*

 * 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

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 * 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,

            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;

        }

    }

}