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ListModules.java
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145 lines (133 loc) · 6.21 KB
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/*
* Copyright (c) 2016, 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.
*/
import java.lang.module.ModuleDescriptor;
import java.lang.module.ModuleReference;
import java.lang.module.ModuleFinder;
import java.io.PrintStream;
import java.lang.reflect.Method;
import java.util.stream.Collectors;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.HashSet;
import jdk.internal.module.ModuleBootstrap;
/**
* Utility for listing the info for all the modules in the Java runtime image.
* This uses the same underlying module finding mechanism as {@code java --list-modules}.
*/
public class ListModules {
/**
* @returns {@code true} if {@code substrings} is empty or if {@code name}
* contains any of the entries in {@code substrings}.
*/
private static boolean matches(String name, String[] substrings) {
if (substrings.length == 0) {
return true;
}
for (String s : substrings) {
if (name.contains(s)) {
return true;
}
}
return false;
}
private static Set<ModuleDescriptor> bootModules() throws Throwable {
Set<ModuleDescriptor> bootModules = new HashSet<>();
Object bootLayer;
// Use reflection to support backward incompatible module API change
// http://hg.openjdk.java.net/jdk9/dev/jdk/rev/fa3c4a60a616#l7.152
try {
bootLayer = Class.forName("java.lang.ModuleLayer").getMethod("boot").invoke(null);
} catch (ClassNotFoundException e) {
bootLayer = Class.forName("java.lang.reflect.Layer").getMethod("boot").invoke(null);
}
Set<Object> modules = (Set<Object>) bootLayer.getClass().getMethod("modules").invoke(bootLayer);
Method getDescriptor = modules.iterator().next().getClass().getMethod("getDescriptor");
for (Object module : modules) {
ModuleDescriptor md = (ModuleDescriptor) getDescriptor.invoke(module);
bootModules.add(md);
}
return bootModules;
}
private static ModuleFinder bootstrapFinder() {
try {
return (ModuleFinder) ModuleBootstrap.class.getMethod("finder").invoke(null);
} catch (Exception e) {
try {
// Use reflection to support backward incompatible module API change
// http://hg.openjdk.java.net/jdk9/dev/jdk/rev/73113c19a5df#l16.26
return (ModuleFinder) ModuleBootstrap.class.getMethod("unlimitedFinder").invoke(null);
} catch (Exception e2) {
throw new RuntimeException(e);
}
}
}
public static void main(String[] args) throws Throwable {
PrintStream out = System.out;
Set<ModuleDescriptor> bootModules = bootModules();
// Use reflection to support backward incompatible module API change
// http://hg.openjdk.java.net/jdk9/hs/jdk/rev/89ef4b822745#l20.679
Method providesMethod = ModuleDescriptor.class.getMethod("provides");
boolean providesIsSet = providesMethod.getReturnType() == Set.class;
// http://hg.openjdk.java.net/jdk9/hs/jdk/rev/89ef4b822745#l18.37
out.println(providesIsSet ? "transitive" : "public");
for (ModuleReference moduleRef : bootstrapFinder().findAll()) {
ModuleDescriptor md = moduleRef.descriptor();
if (!matches(md.name(), args)) {
continue;
}
out.println(md.name());
out.println(" boot " + bootModules.contains(md));
for (ModuleDescriptor.Requires dependency : md.requires()) {
String modifiers = dependency.modifiers().isEmpty() ? "" :
dependency.modifiers().stream().map(e -> e.toString().toLowerCase()).collect(Collectors.joining(" ")) + " ";
out.println(" requires " + modifiers + dependency.name());
}
for (String use : md.uses()) {
out.println(" uses " + use);
}
for (ModuleDescriptor.Exports export : md.exports()) {
String targets = export.targets().isEmpty() ? "" : " to " + export.targets().stream().map(Object::toString).collect(Collectors.joining(" "));
out.println(" exports " + export.source() + targets);
}
for (String pkg : md.packages()) {
out.println(" package " + pkg);
}
Object providesResult = providesMethod.invoke(md);
Iterable<ModuleDescriptor.Provides> providesIterable;
if (providesIsSet) {
providesIterable = (Set<ModuleDescriptor.Provides>) providesResult;
} else {
Map<String, ModuleDescriptor.Provides> providesMap = (Map<String, ModuleDescriptor.Provides>) providesResult;
providesIterable = providesMap.values();
}
for (ModuleDescriptor.Provides provides : providesIterable) {
for (String provider : provides.providers()) {
out.println(" provides " + provides.service() + " with " + provider);
}
}
}
}
}