JDKPlatformProvider.java revision 4171:77a2d6c1f321
1/* 2 * Copyright (c) 2014, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.tools.javac.platform; 27 28import java.io.IOException; 29import java.net.URI; 30import java.nio.charset.Charset; 31import java.nio.file.DirectoryStream; 32import java.nio.file.FileSystem; 33import java.nio.file.FileSystems; 34import java.nio.file.Files; 35import java.nio.file.Path; 36import java.nio.file.Paths; 37import java.nio.file.ProviderNotFoundException; 38import java.util.ArrayList; 39import java.util.Collection; 40import java.util.Collections; 41import java.util.HashMap; 42import java.util.List; 43import java.util.Map; 44import java.util.Set; 45import java.util.TreeSet; 46import java.util.stream.Stream; 47 48import javax.annotation.processing.Processor; 49 50import com.sun.source.util.Plugin; 51import com.sun.tools.javac.jvm.Target; 52 53/** PlatformProvider for JDK N. 54 * 55 * <p><b>This is NOT part of any supported API. 56 * If you write code that depends on this, you do so at your own risk. 57 * This code and its internal interfaces are subject to change or 58 * deletion without notice.</b> 59 */ 60public class JDKPlatformProvider implements PlatformProvider { 61 62 @Override 63 public Iterable<String> getSupportedPlatformNames() { 64 return SUPPORTED_JAVA_PLATFORM_VERSIONS; 65 } 66 67 @Override 68 public PlatformDescription getPlatform(String platformName, String options) { 69 return new PlatformDescriptionImpl(platformName); 70 } 71 72 private static final String[] symbolFileLocation = { "lib", "ct.sym" }; 73 74 private static final Set<String> SUPPORTED_JAVA_PLATFORM_VERSIONS; 75 76 static { 77 SUPPORTED_JAVA_PLATFORM_VERSIONS = new TreeSet<>(); 78 Path ctSymFile = findCtSym(); 79 if (Files.exists(ctSymFile)) { 80 try (FileSystem fs = FileSystems.newFileSystem(ctSymFile, null); 81 DirectoryStream<Path> dir = 82 Files.newDirectoryStream(fs.getRootDirectories().iterator().next())) { 83 for (Path section : dir) { 84 for (char ver : section.getFileName().toString().toCharArray()) { 85 String verString = Character.toString(ver); 86 Target t = Target.lookup(verString); 87 88 if (t != null) { 89 SUPPORTED_JAVA_PLATFORM_VERSIONS.add(targetNumericVersion(t)); 90 } 91 } 92 } 93 } catch (IOException | ProviderNotFoundException ex) { 94 } 95 } 96 } 97 98 private static String targetNumericVersion(Target target) { 99 return Integer.toString(target.ordinal() - Target.JDK1_1.ordinal() + 1); 100 } 101 102 static class PlatformDescriptionImpl implements PlatformDescription { 103 104 private final Map<Path, FileSystem> ctSym2FileSystem = new HashMap<>(); 105 private final String version; 106 107 PlatformDescriptionImpl(String version) { 108 this.version = version; 109 } 110 111 @Override 112 public Collection<Path> getPlatformPath() { 113 List<Path> paths = new ArrayList<>(); 114 Path file = findCtSym(); 115 // file == ${jdk.home}/lib/ct.sym 116 if (Files.exists(file)) { 117 FileSystem fs = ctSym2FileSystem.get(file); 118 if (fs == null) { 119 try { 120 ctSym2FileSystem.put(file, fs = FileSystems.newFileSystem(file, null)); 121 } catch (IOException ex) { 122 throw new IllegalStateException(ex); 123 } 124 } 125 Path root = fs.getRootDirectories().iterator().next(); 126 try (DirectoryStream<Path> dir = Files.newDirectoryStream(root)) { 127 for (Path section : dir) { 128 if (section.getFileName().toString().contains(version)) { 129 Path systemModules = section.resolve("system-modules"); 130 131 if (Files.isRegularFile(systemModules)) { 132 Path modules = 133 FileSystems.getFileSystem(URI.create("jrt:/")) 134 .getPath("modules"); 135 try (Stream<String> lines = 136 Files.lines(systemModules, Charset.forName("UTF-8"))) { 137 lines.map(line -> modules.resolve(line)) 138 .filter(mod -> Files.exists(mod)) 139 .forEach(mod -> paths.add(mod)); 140 } 141 } else { 142 paths.add(section); 143 } 144 } 145 } 146 } catch (IOException ex) { 147 throw new IllegalStateException(ex); 148 } 149 } else { 150 throw new IllegalStateException("Cannot find ct.sym!"); 151 } 152 return paths; 153 } 154 155 @Override 156 public String getSourceVersion() { 157 return version; 158 } 159 160 @Override 161 public String getTargetVersion() { 162 return version; 163 } 164 165 @Override 166 public List<PluginInfo<Processor>> getAnnotationProcessors() { 167 return Collections.emptyList(); 168 } 169 170 @Override 171 public List<PluginInfo<Plugin>> getPlugins() { 172 return Collections.emptyList(); 173 } 174 175 @Override 176 public List<String> getAdditionalOptions() { 177 return Collections.emptyList(); 178 } 179 180 @Override 181 public void close() throws IOException { 182 for (FileSystem fs : ctSym2FileSystem.values()) { 183 fs.close(); 184 } 185 ctSym2FileSystem.clear(); 186 } 187 188 } 189 190 static Path findCtSym() { 191 String javaHome = System.getProperty("java.home"); 192 Path file = Paths.get(javaHome); 193 // file == ${jdk.home} 194 for (String name : symbolFileLocation) 195 file = file.resolve(name); 196 return file; 197 } 198 199} 200