97 lines
3.4 KiB
Java
97 lines
3.4 KiB
Java
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.InputStream;
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import java.io.IOException;
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import java.lang.module.ModuleReader;
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import java.lang.module.ModuleReference;
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import java.net.URI;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import jdk.internal.module.ClassFileConstants;
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import jdk.internal.module.ClassFileAttributes;
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import jdk.internal.module.ClassFileAttributes.ModuleTargetAttribute;
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import jdk.internal.org.objectweb.asm.Attribute;
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import jdk.internal.org.objectweb.asm.ClassReader;
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import jdk.internal.org.objectweb.asm.ClassVisitor;
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import jdk.internal.org.objectweb.asm.Opcodes;
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public class ModuleTargetHelper {
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private ModuleTargetHelper() {}
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public static final class ModuleTarget {
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private String targetPlatform;
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public ModuleTarget(String targetPlatform) {
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this.targetPlatform = targetPlatform;
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}
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public String targetPlatform() {
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return targetPlatform;
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}
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}
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public static ModuleTarget getJavaBaseTarget() throws IOException {
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Path p = Paths.get(URI.create("jrt:/modules/java.base/module-info.class"));
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try (InputStream in = Files.newInputStream(p)) {
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return read(in);
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}
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}
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public static ModuleTarget read(InputStream in) throws IOException {
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ModuleTargetAttribute[] modTargets = new ModuleTargetAttribute[1];
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ClassVisitor cv = new ClassVisitor(Opcodes.ASM5) {
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@Override
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public void visitAttribute(Attribute attr) {
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if (attr instanceof ModuleTargetAttribute) {
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modTargets[0] = (ModuleTargetAttribute)attr;
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}
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}
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};
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// prototype of attributes that should be parsed
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Attribute[] attrs = new Attribute[] {
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new ModuleTargetAttribute()
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};
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// parse module-info.class
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ClassReader cr = new ClassReader(in);
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cr.accept(cv, attrs, 0);
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if (modTargets[0] != null) {
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return new ModuleTarget(modTargets[0].targetPlatform());
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}
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return null;
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}
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public static ModuleTarget read(ModuleReference modRef) throws IOException {
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ModuleReader reader = modRef.open();
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try (InputStream in = reader.open("module-info.class").get()) {
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return read(in);
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} finally {
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reader.close();
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}
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}
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}
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