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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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 */

/*

 * @test

 * @bug     8234025

 * @summary Elements.getPackageElement(ModuleElement,CharSequence) returns null for unnamed package

 * @library /tools/lib /tools/javac/lib

 * @build toolbox.ModuleBuilder toolbox.ToolBox

 * @run main TestModuleUnnamedPackage

 */

import java.io.IOException;

import java.nio.file.Path;

import java.util.List;

import java.util.Set;

import javax.annotation.processing.RoundEnvironment;

import javax.lang.model.element.ModuleElement;

import javax.lang.model.element.PackageElement;

import javax.lang.model.element.TypeElement;

import javax.lang.model.util.Elements;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.StandardJavaFileManager;

import javax.tools.StandardLocation;

import javax.tools.ToolProvider;

import com.sun.source.util.JavacTask;

import toolbox.Assert;

import toolbox.ToolBox;

public class TestModuleUnnamedPackage extends JavacTestingAbstractProcessor {

    public static void main(String... args) throws IOException {

        TestModuleUnnamedPackage t = new TestModuleUnnamedPackage();

            t.run();

    }

    void run() throws IOException {

        ToolBox tb = new ToolBox();

        Path src = Path.of("src");

        tb.writeJavaFiles(src, "module m { exports p; }",

                "package p; public class C { }");

        JavaCompiler c = ToolProvider.getSystemJavaCompiler();

        StandardJavaFileManager fm = c.getStandardFileManager(null, null, null);

        fm.setLocationFromPaths(StandardLocation.SOURCE_PATH, List.of(src));

        List<String> options = List.of("-proc:only");

        Iterable<? extends JavaFileObject> files = fm.getJavaFileObjects(tb.findJavaFiles(src));

        JavacTask t = (JavacTask) c.getTask(null, fm, null, null, null, files);

        t.setProcessors(List.of(this));

        t.call();

    }

    public boolean process(Set<? extends TypeElement> elems, RoundEnvironment rEnv) {

        if (rEnv.processingOver()) {

            Elements elements = processingEnv.getElementUtils();

            ModuleElement m = elements.getModuleElement("m");

            PackageElement unnamed = elements.getPackageElement(m, "");

            System.out.println("module m: " + m);

            System.out.println("module m, unnamed package: " + unnamed);

            Assert.checkNonNull(unnamed, "unnamed package in module m");

        }

        return true;

    }

}