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 * 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.

 *

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 * questions.

 */

/*

 * @test

 * @bug 8206986

 * @summary Ensure SimpleTreeVisitor.visitSwitchExpression behaves as it should

 * @modules jdk.compiler

 */

import java.io.IOException;

import java.io.StringWriter;

import java.net.URI;

import java.util.Arrays;

import java.util.List;

import javax.tools.*;

import com.sun.source.tree.CompilationUnitTree;

import com.sun.source.tree.SwitchExpressionTree;

import com.sun.source.tree.YieldTree;

import com.sun.source.tree.Tree;

import com.sun.source.util.JavacTask;

import com.sun.source.util.SimpleTreeVisitor;

import com.sun.source.util.TreePathScanner;

public class SwitchExpressionSimpleVisitorTest {

    public static void main(String[] args) throws Exception {

        new SwitchExpressionSimpleVisitorTest().run();

    }

    void run() throws Exception {

        String code = "class Test {\n" +

                      "    int t(int i) {\n" +

                      "         return switch(i) {\n" +

                      "              default: yield -1;\n" +

                      "         }\n" +

                      "    }\n" +

                      "}\n";

        int[] callCount = new int[1];

        int[] switchExprNodeCount = new int[1];

        int[] yieldNodeCount = new int[1];

        new TreePathScanner<Void, Void>() {

            @Override

            public Void visitSwitchExpression(SwitchExpressionTree node, Void p) {

                node.accept(new SimpleTreeVisitor<Void, Void>() {

                    @Override

                    protected Void defaultAction(Tree defaultActionNode, Void p) {

                        callCount[0]++;

                        if (node == defaultActionNode) {

                            switchExprNodeCount[0]++;

                        }

                        return null;

                    }

                }, null);

                return super.visitSwitchExpression(node, p);

            }

            @Override

            public Void visitYield(YieldTree node, Void p) {

                node.accept(new SimpleTreeVisitor<Void, Void>() {

                    @Override

                    protected Void defaultAction(Tree defaultActionNode, Void p) {

                        callCount[0]++;

                        if (node == defaultActionNode) {

                            yieldNodeCount[0]++;

                        }

                        return null;

                    }

                }, null);

                return super.visitYield(node, p);

            }

        }.scan(parse(code), null);

        if (callCount[0] != 2 || switchExprNodeCount[0] != 1 ||

            yieldNodeCount[0] != 1) {

            throw new AssertionError("Unexpected counts; callCount=" + callCount[0] +

                                     ", switchExprNodeCount=" + switchExprNodeCount[0] +

                                     ", yieldNodeCount=" + yieldNodeCount[0]);

        }

    }

    private CompilationUnitTree parse(String code) throws IOException {

        final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

        assert tool != null;

        DiagnosticListener<JavaFileObject> noErrors = d -> {};

        StringWriter out = new StringWriter();

        JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors,

            Arrays.asList(new MyFileObject(code)));

        return ct.parse().iterator().next();

    }

    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;

        }

    }

}