1 /*

     2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

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

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

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package build.tools.symbolgenerator;

    27 

    28 import java.io.IOException;

    29 import java.util.Arrays;

    30 import java.util.HashSet;

    31 import java.util.LinkedList;

    32 import java.util.List;

    33 import java.util.Set;

    34 import java.util.stream.Collectors;

    35 

    36 import javax.lang.model.element.ModuleElement.RequiresDirective;

    37 import javax.lang.model.util.Elements;

    38 import javax.tools.JavaCompiler;

    39 import javax.tools.ToolProvider;

    40 

    41 import com.sun.tools.javac.api.JavacTaskImpl;

    42 import com.sun.tools.javac.code.Symbol.ModuleSymbol;

    43 

    44 /**

    45  * Print reflexive transitive closure of the given modules along their requires transitive edges.

    46  */

    47 public class TransitiveDependencies {

    48 

    49     private static void help() {

    50         System.err.println("java TransitiveDependencies <module-source-path> <root-modules>");

    51     }

    52 

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

    54         if (args.length < 1) {

    55             help();

    56             return ;

    57         }

    58 

    59         JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

    60         List<String> options = Arrays.asList("-source", "9",

    61                                              "-target", "9",

    62                                              "--system", "none",

    63                                              "--module-source-path", args[0],

    64                                              "--add-modules", Arrays.stream(args)

    65                                                                     .skip(1)

    66                                                                     .collect(Collectors.joining(",")));

    67         List<String> jlObjectList = Arrays.asList("java.lang.Object");

    68         JavacTaskImpl task = (JavacTaskImpl) compiler.getTask(null, null, d -> {}, options, jlObjectList, null);

    69         task.enter();

    70         Elements elements = task.getElements();

    71         List<String> todo = new LinkedList<>();

    72         Arrays.stream(args).skip(1).forEach(todo::add);

    73         Set<String> allModules = new HashSet<>();

    74 

    75         while (!todo.isEmpty()) {

    76             String current = todo.remove(0);

    77 

    78             if (!allModules.add(current))

    79                 continue;

    80 

    81             ModuleSymbol mod = (ModuleSymbol) elements.getModuleElement(current);

    82 

    83             if (mod == null) {

    84                 throw new IllegalStateException("Missing: " + current);

    85             }

    86 

    87              //use the internal structure to avoid unnecesarily completing the symbol using the UsesProvidesVisitor:

    88             for (RequiresDirective rd : mod.requires) {

    89                 if (rd.isTransitive()) {

    90                     todo.add(rd.getDependency().getQualifiedName().toString());

    91                 }

    92             }

    93         }

    94 

    95         allModules.add("java.base");

    96         allModules.add("jdk.unsupported");

    97 

    98         allModules.stream()

    99                   .sorted()

   100                   .forEach(System.out::println);

   101     }

   102 

   103 }