TransitiveDependencies.java revision 4171:77a2d6c1f321 
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
26package build.tools.symbolgenerator;
27
28import java.io.IOException;
29import java.util.Arrays;
30import java.util.HashSet;
31import java.util.LinkedList;
32import java.util.List;
33import java.util.Set;
34import java.util.stream.Collectors;
35
36import javax.lang.model.element.ModuleElement.RequiresDirective;
37import javax.lang.model.util.Elements;
38import javax.tools.JavaCompiler;
39import javax.tools.ToolProvider;
40
41import com.sun.tools.javac.api.JavacTaskImpl;
42import com.sun.tools.javac.code.Symbol.ModuleSymbol;
43
44/**
45 * Print reflexive transitive closure of the given modules along their requires transitive edges.
46 */
47public 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}
104