| /* |
| * Copyright (c) 2014, 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. |
| */ |
| |
| package jdk.internal.module; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.lang.module.ModuleDescriptor.Version; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| 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.ClassWriter; |
| import jdk.internal.org.objectweb.asm.Opcodes; |
| |
| import static jdk.internal.module.ClassFileAttributes.*; |
| |
| /** |
| * Utility class to extend a module-info.class with additional attributes. |
| */ |
| |
| public final class ModuleInfoExtender { |
| |
| // the input stream to read the original module-info.class |
| private final InputStream in; |
| |
| // the packages in the ModulePackages attribute |
| private Set<String> packages; |
| |
| // the value of the module_version in Module attribute |
| private Version version; |
| |
| // the value of the ModuleMainClass attribute |
| private String mainClass; |
| |
| // the values for the ModuleTarget attribute |
| private String osName; |
| private String osArch; |
| private String osVersion; |
| |
| // the hashes for the ModuleHashes attribute |
| private ModuleHashes hashes; |
| |
| // the value of the ModuleResolution attribute |
| private ModuleResolution moduleResolution; |
| |
| private ModuleInfoExtender(InputStream in) { |
| this.in = in; |
| } |
| |
| /** |
| * Sets the set of packages for the ModulePackages attribute |
| */ |
| public ModuleInfoExtender packages(Set<String> packages) { |
| this.packages = Collections.unmodifiableSet(packages); |
| return this; |
| } |
| |
| /** |
| * Sets the value of the module_version in Module attribute. |
| */ |
| public ModuleInfoExtender version(Version version) { |
| this.version = version; |
| return this; |
| } |
| |
| /** |
| * Sets the value of the ModuleMainClass attribute. |
| */ |
| public ModuleInfoExtender mainClass(String mainClass) { |
| this.mainClass = mainClass; |
| return this; |
| } |
| |
| /** |
| * Sets the values for the ModuleTarget attribute. |
| */ |
| public ModuleInfoExtender targetPlatform(String osName, |
| String osArch, |
| String osVersion) { |
| this.osName = osName; |
| this.osArch = osArch; |
| this.osVersion = osVersion; |
| return this; |
| } |
| |
| /** |
| * The ModuleHashes attribute will be emitted to the module-info with |
| * the hashes encapsulated in the given {@code ModuleHashes} |
| * object. |
| */ |
| public ModuleInfoExtender hashes(ModuleHashes hashes) { |
| this.hashes = hashes; |
| return this; |
| } |
| |
| /** |
| * Sets the value for the ModuleResolution attribute. |
| */ |
| public ModuleInfoExtender moduleResolution(ModuleResolution mres) { |
| this.moduleResolution = mres; |
| return this; |
| } |
| |
| /** |
| * A ClassVisitor that supports adding class file attributes. If an |
| * attribute already exists then the first occurence of the attribute |
| * is replaced. |
| */ |
| private static class AttributeAddingClassVisitor extends ClassVisitor { |
| private Map<String, Attribute> attrs = new HashMap<>(); |
| |
| AttributeAddingClassVisitor(int api, ClassVisitor cv) { |
| super(api, cv); |
| } |
| |
| void addAttribute(Attribute attr) { |
| attrs.put(attr.type, attr); |
| } |
| |
| @Override |
| public void visitAttribute(Attribute attr) { |
| String name = attr.type; |
| Attribute replacement = attrs.get(name); |
| if (replacement != null) { |
| attr = replacement; |
| attrs.remove(name); |
| } |
| super.visitAttribute(attr); |
| } |
| |
| /** |
| * Adds any remaining attributes that weren't replaced to the |
| * class file. |
| */ |
| void finish() { |
| attrs.values().forEach(a -> super.visitAttribute(a)); |
| attrs.clear(); |
| } |
| } |
| |
| /** |
| * Outputs the modified module-info.class to the given output stream. |
| * Once this method has been called then the Extender object should |
| * be discarded. |
| */ |
| public void write(OutputStream out) throws IOException { |
| // emit to the output stream |
| out.write(toByteArray()); |
| } |
| |
| /** |
| * Returns the bytes of the modified module-info.class. |
| * Once this method has been called then the Extender object should |
| * be discarded. |
| */ |
| public byte[] toByteArray() throws IOException { |
| ClassWriter cw |
| = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES); |
| |
| AttributeAddingClassVisitor cv |
| = new AttributeAddingClassVisitor(Opcodes.ASM5, cw); |
| |
| ClassReader cr = new ClassReader(in); |
| |
| if (packages != null) |
| cv.addAttribute(new ModulePackagesAttribute(packages)); |
| if (mainClass != null) |
| cv.addAttribute(new ModuleMainClassAttribute(mainClass)); |
| if (osName != null || osArch != null || osVersion != null) |
| cv.addAttribute(new ModuleTargetAttribute(osName, osArch, osVersion)); |
| if (hashes != null) |
| cv.addAttribute(new ModuleHashesAttribute(hashes)); |
| if (moduleResolution != null) |
| cv.addAttribute(new ModuleResolutionAttribute(moduleResolution.value())); |
| |
| List<Attribute> attrs = new ArrayList<>(); |
| |
| // prototypes of attributes that should be parsed |
| attrs.add(new ModuleAttribute(version)); |
| attrs.add(new ModulePackagesAttribute()); |
| attrs.add(new ModuleMainClassAttribute()); |
| attrs.add(new ModuleTargetAttribute()); |
| attrs.add(new ModuleHashesAttribute()); |
| |
| cr.accept(cv, attrs.toArray(new Attribute[0]), 0); |
| |
| // add any attributes that didn't replace previous attributes |
| cv.finish(); |
| |
| return cw.toByteArray(); |
| } |
| |
| /** |
| * Returns an {@code Extender} that may be used to add additional |
| * attributes to the module-info.class read from the given input |
| * stream. |
| */ |
| public static ModuleInfoExtender newExtender(InputStream in) { |
| return new ModuleInfoExtender(in); |
| } |
| |
| } |