/*+
−
 * Copyright (c) 2017, 2018, 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.  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+
−
 * 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.+
−
 */+
−
+
−
package build.tools.symbolgenerator;+
−
+
−
import java.io.IOException;+
−
import java.io.PrintWriter;+
−
import java.io.Writer;+
−
import java.nio.charset.Charset;+
−
import java.nio.file.Files;+
−
import java.nio.file.Path;+
−
import java.nio.file.Paths;+
−
import java.util.ArrayDeque;+
−
import java.util.Arrays;+
−
import java.util.Deque;+
−
import java.util.HashSet;+
−
import java.util.LinkedList;+
−
import java.util.List;+
−
import java.util.Locale;+
−
import java.util.Set;+
−
import java.util.stream.Collectors;+
−
+
−
import javax.lang.model.element.ModuleElement.RequiresDirective;+
−
import javax.lang.model.util.Elements;+
−
import javax.tools.JavaCompiler;+
−
+
−
import com.sun.tools.javac.api.JavacTaskImpl;+
−
import com.sun.tools.javac.api.JavacTool;+
−
import com.sun.tools.javac.code.Source;+
−
import com.sun.tools.javac.code.Symbol.ModuleSymbol;+
−
import com.sun.tools.javac.jvm.Target;+
−
+
−
/**+
−
 * Write reflexive transitive closure of the given modules along their requires transitive edges into+
−
 * file <version>/system-modules in the specified directory.+
−
 */+
−
public class TransitiveDependencies {+
−
+
−
    private static void help() {+
−
        System.err.println("java TransitiveDependencies <target-directory> <module-source-path> <root-modules>");+
−
    }+
−
+
−
    public static void main(String... args) throws IOException {+
−
        if (args.length < 2) {+
−
            help();+
−
            return ;+
−
        }+
−
+
−
        JavaCompiler compiler = JavacTool.create();+
−
        List<String> options = List.of("-source", Source.DEFAULT.name,+
−
                                       "-target", Target.DEFAULT.name,+
−
                                       "-proc:only",+
−
                                       "--system", "none",+
−
                                       "--module-source-path", args[1],+
−
                                       "--add-modules", Arrays.stream(args)+
−
                                                              .skip(2)+
−
                                                              .collect(Collectors.joining(",")));+
−
        List<String> jlObjectList = List.of("java.lang.Object");+
−
        JavacTaskImpl task = (JavacTaskImpl) compiler.getTask(null, null, null, options, jlObjectList, null);+
−
        task.enter();+
−
        Elements elements = task.getElements();+
−
        Deque<String> todo = new ArrayDeque<>();+
−
        Arrays.stream(args).skip(2).forEach(todo::add);+
−
        Set<String> allModules = new HashSet<>();+
−
+
−
        while (!todo.isEmpty()) {+
−
            String current = todo.removeFirst();+
−
+
−
            if (!allModules.add(current))+
−
                continue;+
−
+
−
            ModuleSymbol mod = (ModuleSymbol) elements.getModuleElement(current);+
−
+
−
            if (mod == null) {+
−
                throw new IllegalStateException("Missing: " + current);+
−
            }+
−
+
−
             //use the internal structure to avoid unnecesarily completing the symbol using the UsesProvidesVisitor:+
−
            for (RequiresDirective rd : mod.requires) {+
−
                if (rd.isTransitive()) {+
−
                    todo.offerLast(rd.getDependency().getQualifiedName().toString());+
−
                }+
−
            }+
−
        }+
−
+
−
        allModules.add("java.base");+
−
        allModules.add("jdk.unsupported");+
−
+
−
        String version =+
−
                Integer.toString(Integer.parseInt(Source.DEFAULT.name), Character.MAX_RADIX);+
−
        version = version.toUpperCase(Locale.ROOT);+
−
+
−
        Path targetFile = Paths.get(args[0]).resolve(version).resolve("system-modules");+
−
+
−
        Files.createDirectories(targetFile.getParent());+
−
+
−
        try (Writer w = Files.newBufferedWriter(targetFile);+
−
             PrintWriter out = new PrintWriter(w)) {+
−
            allModules.stream()+
−
                      .sorted()+
−
                      .forEach(out::println);+
−
        }+
−
    }+
−
+
−
}+
−