TransitiveDependencies.java revision 4254:d601b22360fa 
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                                             "-proc:only",
63                                             "--system", "none",
64                                             "--module-source-path", args[0],
65                                             "--add-modules", Arrays.stream(args)
66                                                                    .skip(1)
67                                                                    .collect(Collectors.joining(",")));
68        List<String> jlObjectList = Arrays.asList("java.lang.Object");
69        JavacTaskImpl task = (JavacTaskImpl) compiler.getTask(null, null, null, options, jlObjectList, null);
70        task.enter();
71        Elements elements = task.getElements();
72        List<String> todo = new LinkedList<>();
73        Arrays.stream(args).skip(1).forEach(todo::add);
74        Set<String> allModules = new HashSet<>();
75
76        while (!todo.isEmpty()) {
77            String current = todo.remove(0);
78
79            if (!allModules.add(current))
80                continue;
81
82            ModuleSymbol mod = (ModuleSymbol) elements.getModuleElement(current);
83
84            if (mod == null) {
85                throw new IllegalStateException("Missing: " + current);
86            }
87
88             //use the internal structure to avoid unnecesarily completing the symbol using the UsesProvidesVisitor:
89            for (RequiresDirective rd : mod.requires) {
90                if (rd.isTransitive()) {
91                    todo.add(rd.getDependency().getQualifiedName().toString());
92                }
93            }
94        }
95
96        allModules.add("java.base");
97        allModules.add("jdk.unsupported");
98
99        allModules.stream()
100                  .sorted()
101                  .forEach(System.out::println);
102    }
103
104}
105