| /* |
| * Copyright (c) 2017, 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. |
| * |
| * 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.io.InputStream; |
| import java.io.IOException; |
| import java.lang.module.ModuleReader; |
| import java.lang.module.ModuleReference; |
| import java.net.URI; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import jdk.internal.module.ClassFileConstants; |
| import jdk.internal.module.ClassFileAttributes; |
| import jdk.internal.module.ClassFileAttributes.ModuleTargetAttribute; |
| import jdk.internal.org.objectweb.asm.Attribute; |
| import jdk.internal.org.objectweb.asm.ClassReader; |
| import jdk.internal.org.objectweb.asm.ClassVisitor; |
| import jdk.internal.org.objectweb.asm.Opcodes; |
| |
| public class ModuleTargetHelper { |
| private ModuleTargetHelper() {} |
| |
| public static final class ModuleTarget { |
| private String targetPlatform; |
| |
| public ModuleTarget(String targetPlatform) { |
| this.targetPlatform = targetPlatform; |
| } |
| |
| public String targetPlatform() { |
| return targetPlatform; |
| } |
| } |
| |
| public static ModuleTarget getJavaBaseTarget() throws IOException { |
| Path p = Paths.get(URI.create("jrt:/modules/java.base/module-info.class")); |
| try (InputStream in = Files.newInputStream(p)) { |
| return read(in); |
| } |
| } |
| |
| public static ModuleTarget read(InputStream in) throws IOException { |
| ModuleTargetAttribute[] modTargets = new ModuleTargetAttribute[1]; |
| ClassVisitor cv = new ClassVisitor(Opcodes.ASM5) { |
| @Override |
| public void visitAttribute(Attribute attr) { |
| if (attr instanceof ModuleTargetAttribute) { |
| modTargets[0] = (ModuleTargetAttribute)attr; |
| } |
| } |
| }; |
| |
| // prototype of attributes that should be parsed |
| Attribute[] attrs = new Attribute[] { |
| new ModuleTargetAttribute() |
| }; |
| |
| // parse module-info.class |
| ClassReader cr = new ClassReader(in); |
| cr.accept(cv, attrs, 0); |
| if (modTargets[0] != null) { |
| return new ModuleTarget(modTargets[0].targetPlatform()); |
| } |
| |
| return null; |
| } |
| |
| public static ModuleTarget read(ModuleReference modRef) throws IOException { |
| ModuleReader reader = modRef.open(); |
| try (InputStream in = reader.open("module-info.class").get()) { |
| return read(in); |
| } finally { |
| reader.close(); |
| } |
| } |
| } |