Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.options/src/jdk/vm/ci/options/JVMCIJarsOptionDescriptorsProvider.java @ 22672:1bbd4a7c274b
Rename jdk.internal.jvmci to jdk.vm.ci
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
---|---|
date | Thu, 08 Oct 2015 17:28:41 -0700 |
parents | jvmci/jdk.internal.jvmci.options/src/jdk/internal/jvmci/options/JVMCIJarsOptionDescriptorsProvider.java@5cd42bb63fad |
children |
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/* * Copyright (c) 2014, 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. * * 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.vm.ci.options; import java.io.BufferedReader; import java.io.File; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.Collections; import java.util.Iterator; import java.util.List; import java.util.jar.JarFile; import java.util.zip.ZipEntry; import jdk.vm.ci.options.OptionsParser.OptionDescriptorsProvider; /** * Access to the {@link OptionDescriptors} declared by * {@code META-INF/services/jdk.vm.ci.options.OptionDescriptors} files in * {@code <jre>/lib/jvmci/*.jar}. */ final class JVMCIJarsOptionDescriptorsProvider implements OptionDescriptorsProvider { static final String OptionDescriptorsServiceFile = "META-INF/services/" + OptionDescriptors.class.getName(); private final Iterator<File> jars; private final List<OptionDescriptors> optionsDescriptorsList; /** * Creates a {@link JVMCIJarsOptionDescriptorsProvider} if at least one JVMCI jar is available * otherwise returns null. */ static JVMCIJarsOptionDescriptorsProvider create() { List<File> jarsList = findJVMCIJars(); if (jarsList.isEmpty()) { return null; } return new JVMCIJarsOptionDescriptorsProvider(jarsList); } private JVMCIJarsOptionDescriptorsProvider(List<File> jarsList) { this.jars = jarsList.iterator(); this.optionsDescriptorsList = new ArrayList<>(jarsList.size() * 3); } /** * Finds the list of JVMCI jars. */ private static List<File> findJVMCIJars() { File javaHome = new File(System.getProperty("java.home")); File lib = new File(javaHome, "lib"); File jvmci = new File(lib, "jvmci"); if (!jvmci.exists()) { return Collections.emptyList(); } List<File> jarFiles = new ArrayList<>(); for (String fileName : jvmci.list()) { if (fileName.endsWith(".jar")) { File file = new File(jvmci, fileName); if (file.isDirectory()) { continue; } jarFiles.add(file); } } return jarFiles; } public OptionDescriptor get(String name) { // Look up loaded option descriptors first for (OptionDescriptors optionDescriptors : optionsDescriptorsList) { OptionDescriptor desc = optionDescriptors.get(name); if (desc != null) { return desc; } } while (jars.hasNext()) { File path = jars.next(); try (JarFile jar = new JarFile(path)) { ZipEntry entry = jar.getEntry(OptionDescriptorsServiceFile); if (entry != null) { BufferedReader br = new BufferedReader(new InputStreamReader(jar.getInputStream(entry))); String line = null; OptionDescriptor desc = null; while ((line = br.readLine()) != null) { OptionDescriptors options; try { options = (OptionDescriptors) Class.forName(line).newInstance(); optionsDescriptorsList.add(options); if (desc == null) { desc = options.get(name); } } catch (Exception e) { throw new InternalError("Error instantiating class " + line + " read from " + path, e); } } if (desc != null) { return desc; } } } catch (IOException e) { throw new InternalError("Error reading " + path, e); } } return null; } }