author | alanb |
Fri, 16 Dec 2016 06:19:16 +0000 | |
changeset 42703 | 20c39ea4a507 |
parent 42338 | a60f280f803c |
child 44359 | c6761862ca0b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2016, 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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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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package jdk.internal.module; |
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import java.io.IOException; |
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import java.io.OutputStream; |
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import java.lang.module.ModuleDescriptor; |
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import java.nio.ByteBuffer; |
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import java.util.stream.Stream; |
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import jdk.internal.org.objectweb.asm.ClassWriter; |
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import jdk.internal.org.objectweb.asm.Opcodes; |
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import static jdk.internal.module.ClassFileAttributes.*; |
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import static jdk.internal.module.ClassFileConstants.ACC_MODULE; |
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/** |
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* Utility class to write a ModuleDescriptor as a module-info.class. |
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*/ |
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public final class ModuleInfoWriter { |
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private ModuleInfoWriter() { } |
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/** |
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* Writes the given module descriptor to a module-info.class file, |
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* returning it in a byte array. |
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*/ |
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private static byte[] toModuleInfo(ModuleDescriptor md) { |
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ClassWriter cw = new ClassWriter(0); |
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cw.visit(Opcodes.V1_9, ACC_MODULE, "module-info", null, null, null); |
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cw.visitAttribute(new ModuleAttribute(md)); |
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// for tests: write the ModulePackages attribute when there are packages |
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// that aren't exported or open |
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Stream<String> exported = md.exports().stream() |
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.map(ModuleDescriptor.Exports::source); |
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Stream<String> open = md.opens().stream() |
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.map(ModuleDescriptor.Opens::source); |
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long exportedOrOpen = Stream.concat(exported, open).distinct().count(); |
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if (md.packages().size() > exportedOrOpen) |
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cw.visitAttribute(new ModulePackagesAttribute(md.packages())); |
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// write ModuleMainClass if the module has a main class |
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md.mainClass().ifPresent(mc -> cw.visitAttribute(new ModuleMainClassAttribute(mc))); |
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// write ModuleTarget attribute if have any of OS name/arch/version |
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String osName = md.osName().orElse(null); |
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String osArch = md.osArch().orElse(null); |
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String osVersion = md.osVersion().orElse(null); |
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if (osName != null || osArch != null || osVersion != null) { |
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cw.visitAttribute(new ModuleTargetAttribute(osName, osArch, osVersion)); |
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} |
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cw.visitEnd(); |
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return cw.toByteArray(); |
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} |
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/** |
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* Writes a module descriptor to the given output stream as a |
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* module-info.class. |
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*/ |
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public static void write(ModuleDescriptor descriptor, OutputStream out) |
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throws IOException |
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{ |
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byte[] bytes = toModuleInfo(descriptor); |
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out.write(bytes); |
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} |
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/** |
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* Returns a {@code ByteBuffer} containing the given module descriptor |
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* in module-info.class format. |
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*/ |
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public static ByteBuffer toByteBuffer(ModuleDescriptor descriptor) { |
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byte[] bytes = toModuleInfo(descriptor); |
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return ByteBuffer.wrap(bytes); |
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} |
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} |