1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.io.InputStream; 25 import java.io.IOException; 26 import java.lang.module.ModuleReader; 27 import java.lang.module.ModuleReference; 28 import java.net.URI; 29 import java.nio.file.Files; 30 import java.nio.file.Path; 31 import java.nio.file.Paths; 32 33 import jdk.internal.module.ModuleInfo; 34 import jdk.internal.module.ModuleInfo.Attributes; 35 36 public class ModuleTargetHelper { 37 private ModuleTargetHelper() {} 38 39 public static final class ModuleTarget { 40 private String targetPlatform; 41 42 public ModuleTarget(String targetPlatform) { 43 this.targetPlatform = targetPlatform; 44 } 45 46 public String targetPlatform() { 47 return targetPlatform; 48 } 49 } 50 51 public static ModuleTarget getJavaBaseTarget() throws IOException { 52 Path p = Paths.get(URI.create("jrt:/modules/java.base/module-info.class")); 53 try (InputStream in = Files.newInputStream(p)) { 54 return read(in); 55 } 56 } 57 58 public static ModuleTarget read(InputStream in) throws IOException { 59 ModuleInfo.Attributes attrs = ModuleInfo.read(in, null); 60 if (attrs.target() != null) { 61 return new ModuleTarget(attrs.target().targetPlatform()); 62 } else { 63 return null; 64 } 65 } 66 67 public static ModuleTarget read(ModuleReference modRef) throws IOException { 68 ModuleReader reader = modRef.open(); 69 try (InputStream in = reader.open("module-info.class").get()) { 70 return read(in); 71 } finally { 72 reader.close(); 73 } 74 } 75 }