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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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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

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 *

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/*

 * @test

 * @bug 8054717

 * @summary Make sure changes of public API on classpath triggers recompilation

 * @library /tools/lib

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

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

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

 *          jdk.compiler/com.sun.tools.sjavac

 * @build Wrapper ToolBox

 * @run main Wrapper ClasspathDependencies

 */

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

import java.io.IOException;

import java.nio.file.FileVisitResult;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.nio.file.SimpleFileVisitor;

import java.nio.file.attribute.BasicFileAttributes;

import java.nio.file.attribute.FileTime;

public class ClasspathDependencies extends SjavacBase {

    static final String server = "--server:portfile=testserver,background=false";

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

        Path root = Paths.get(ClasspathDependencies.class.getSimpleName() + "Test");

        delete(root);

        Path src = root.resolve("src");

        Path classes = root.resolve("classes");

        Path srcDep = root.resolve("srcDep");

        Path classesDep = root.resolve("classesDep");

        ////////////////////////////////////////////////////////////////////////

        headline("Create a test dependency, Dep.class, and put it in the classpath dir");

        String depCode = "package dep; public class Dep { public void m1() {} }";

        toolbox.writeFile(srcDep.resolve("dep/Dep.java"), depCode);

        int rc = compile(server, "-d", classesDep, srcDep);

        check(rc == 0, "Compilation failed unexpectedly");

        ////////////////////////////////////////////////////////////////////////

        headline("Compile and link against the Dep.class");

        toolbox.writeFile(src.resolve("pkg/C.java"),

                          "package pkg;" +

                          "import dep.Dep;" +

                          "public class C { Dep dep; public void m() { new Dep().m1(); } }");

        rc = compile(server, "-d", classes, src, "-cp", classesDep);

        check(rc == 0, "Compilation failed unexpectedly");

        FileTime modTime1 = Files.getLastModifiedTime(classes.resolve("pkg/C.class"));

        ////////////////////////////////////////////////////////////////////////

        headline("Update dependency (without changing the public api)");

        Thread.sleep(2000);

        depCode = depCode.replaceAll("}$", "private void m2() {} }");

        toolbox.writeFile(srcDep.resolve("dep/Dep.java"), depCode);

        rc = compile(server, "-d", classesDep, srcDep);

        check(rc == 0, "Compilation failed unexpectedly");

        ////////////////////////////////////////////////////////////////////////

        headline("Make sure that this does not trigger recompilation of C.java");

        rc = compile(server, "-d", classes, src, "-cp", classesDep);

        check(rc == 0, "Compilation failed unexpectedly");

        FileTime modTime2 = Files.getLastModifiedTime(classes.resolve("pkg/C.class"));

        check(modTime1.equals(modTime2), "Recompilation erroneously triggered");

        ////////////////////////////////////////////////////////////////////////

        headline("Update public API of dependency");

        Thread.sleep(2000);

        depCode = depCode.replace("m1()", "m1(String... arg)");

        toolbox.writeFile(srcDep.resolve("dep/Dep.java"), depCode);

        rc = compile(server, "-d", classesDep, srcDep);

        check(rc == 0, "Compilation failed unexpectedly");

        ////////////////////////////////////////////////////////////////////////

        headline("Make sure that recompilation of C.java is triggered");

        rc = compile(server, "-d", classes, src, "-cp", classesDep);

        check(rc == 0, "Compilation failed unexpectedly");

        FileTime modTime3 = Files.getLastModifiedTime(classes.resolve("pkg/C.class"));

        check(modTime2.compareTo(modTime3) < 0, "Recompilation not triggered");

    }

    static void headline(String str) {

        System.out.println();

        System.out.println(str);

        System.out.println(str.replaceAll(".", "-"));

    }

    static void delete(Path root) throws IOException {

        if (!Files.exists(root))

            return;

        Files.walkFileTree(root, new SimpleFileVisitor<Path>() {

                 @Override

                 public FileVisitResult visitFile(Path f, BasicFileAttributes a)

                         throws IOException {

                     Files.delete(f);

                     return FileVisitResult.CONTINUE;

                 }

                 @Override

                 public FileVisitResult postVisitDirectory(Path dir, IOException e)

                         throws IOException {

                     if (e != null)

                         throw e;

                     if (!dir.equals(root))

                         Files.delete(dir);

                     return FileVisitResult.CONTINUE;

                 }

            });

    }

}