/*

 * Copyright (c) 2017, 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 8175235

 * @summary type inference regression after JDK-8046685

 * @library /tools/javac/lib

 * @modules jdk.compiler/com.sun.source.util

 *          jdk.compiler/com.sun.tools.javac.api

 *          jdk.compiler/com.sun.tools.javac.code

 *          jdk.compiler/com.sun.tools.javac.file

 *          jdk.compiler/com.sun.tools.javac.tree

 *          jdk.compiler/com.sun.tools.javac.util

 * @build DPrinter

 * @run main InferenceRegressionTest02

 */

import java.io.*;

import java.net.URI;

import java.util.Arrays;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.SimpleJavaFileObject;

import javax.tools.ToolProvider;

import com.sun.source.tree.CompilationUnitTree;

import com.sun.source.util.JavacTask;

import com.sun.source.util.Trees;

import com.sun.tools.javac.api.JavacTrees;

import com.sun.tools.javac.file.JavacFileManager;

import com.sun.tools.javac.tree.JCTree;

import com.sun.tools.javac.util.Assert;

import com.sun.tools.javac.util.Context;

public class InferenceRegressionTest02 {

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

        new InferenceRegressionTest02().run();

    }

    void run() throws Exception {

        Context context = new Context();

        JavacFileManager.preRegister(context);

        Trees trees = JavacTrees.instance(context);

        StringWriter strOut = new StringWriter();

        PrintWriter pw = new PrintWriter(strOut);

        DPrinter dprinter = new DPrinter(pw, trees);

        final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

        JavacTask ct = (JavacTask)tool.getTask(null, null, null, null, null, Arrays.asList(new JavaSource()));

        Iterable<? extends CompilationUnitTree> elements = ct.parse();

        ct.analyze();

        Assert.check(elements.iterator().hasNext());

        dprinter.treeTypes(true).printTree("", (JCTree)elements.iterator().next());

        String output = strOut.toString();

        Assert.check(!output.contains("java.lang.Object"), "there shouldn't be any type instantiated to Object");

    }

    static class JavaSource extends SimpleJavaFileObject {

        String source =

                "import java.util.function.*;\n" +

                "import java.util.*;\n" +

                "import java.util.stream.*;\n" +

                "class Foo {\n" +

                "    void test(List<Map.Entry<Foo, Foo>> ls) {\n" +

                "        Map<Foo, Set<Foo>> res = ls.stream()\n" +

                "                .collect(Collectors.groupingBy(Map.Entry::getKey,\n" +

                "                        HashMap::new,\n" +

                "                        Collectors.mapping(Map.Entry::getValue, Collectors.toSet())));\n" +

                "    }\n" +

                "}";

        public JavaSource() {

            super(URI.create("myfo:/Foo.java"), JavaFileObject.Kind.SOURCE);

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return source;

        }

    }

}