Mercurial > hg > graal-jvmci-8

annotate jvmci/jdk.vm.ci.options/src/jdk/vm/ci/options/JVMCIJarsOptionDescriptorsProvider.java @ 22672:1bbd4a7c274b

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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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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package jdk.vm.ci.options;
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24
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25 import java.io.BufferedReader;
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26 import java.io.File;
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27 import java.io.IOException;
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28 import java.io.InputStreamReader;
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29 import java.util.ArrayList;
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30 import java.util.Collections;
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31 import java.util.Iterator;
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32 import java.util.List;
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33 import java.util.jar.JarFile;
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34 import java.util.zip.ZipEntry;
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35
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36 import jdk.vm.ci.options.OptionsParser.OptionDescriptorsProvider;
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37
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38 /**
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39 * Access to the {@link OptionDescriptors} declared by
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40 * {@code META-INF/services/jdk.vm.ci.options.OptionDescriptors} files in
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41 * {@code <jre>/lib/jvmci/*.jar}.
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42 */
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43 final class JVMCIJarsOptionDescriptorsProvider implements OptionDescriptorsProvider {
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44
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45 static final String OptionDescriptorsServiceFile = "META-INF/services/" + OptionDescriptors.class.getName();
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46
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47 private final Iterator<File> jars;
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48 private final List<OptionDescriptors> optionsDescriptorsList;
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49
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50 /**
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51 * Creates a {@link JVMCIJarsOptionDescriptorsProvider} if at least one JVMCI jar is available
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52 * otherwise returns null.
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53 */
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54 static JVMCIJarsOptionDescriptorsProvider create() {
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55 List<File> jarsList = findJVMCIJars();
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56 if (jarsList.isEmpty()) {
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57 return null;
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58 }
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59 return new JVMCIJarsOptionDescriptorsProvider(jarsList);
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60 }
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61
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62 private JVMCIJarsOptionDescriptorsProvider(List<File> jarsList) {
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63 this.jars = jarsList.iterator();
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64 this.optionsDescriptorsList = new ArrayList<>(jarsList.size() * 3);
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65 }
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66
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67 /**
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68 * Finds the list of JVMCI jars.
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69 */
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70 private static List<File> findJVMCIJars() {
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71 File javaHome = new File(System.getProperty("java.home"));
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72 File lib = new File(javaHome, "lib");
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73 File jvmci = new File(lib, "jvmci");
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74 if (!jvmci.exists()) {
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75 return Collections.emptyList();
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76 }
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77
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78 List<File> jarFiles = new ArrayList<>();
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79 for (String fileName : jvmci.list()) {
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80 if (fileName.endsWith(".jar")) {
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81 File file = new File(jvmci, fileName);
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82 if (file.isDirectory()) {
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83 continue;
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84 }
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85 jarFiles.add(file);
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86 }
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87 }
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88 return jarFiles;
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89 }
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90
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91 public OptionDescriptor get(String name) {
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92 // Look up loaded option descriptors first
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93 for (OptionDescriptors optionDescriptors : optionsDescriptorsList) {
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94 OptionDescriptor desc = optionDescriptors.get(name);
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95 if (desc != null) {
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96 return desc;
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97 }
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98 }
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99 while (jars.hasNext()) {
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100 File path = jars.next();
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101 try (JarFile jar = new JarFile(path)) {
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102 ZipEntry entry = jar.getEntry(OptionDescriptorsServiceFile);
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103 if (entry != null) {
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104 BufferedReader br = new BufferedReader(new InputStreamReader(jar.getInputStream(entry)));
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105 String line = null;
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106 OptionDescriptor desc = null;
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107 while ((line = br.readLine()) != null) {
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108 OptionDescriptors options;
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109 try {
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110 options = (OptionDescriptors) Class.forName(line).newInstance();
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111 optionsDescriptorsList.add(options);
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112 if (desc == null) {
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113 desc = options.get(name);
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114 }
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115 } catch (Exception e) {
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116 throw new InternalError("Error instantiating class " + line + " read from " + path, e);
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117 }
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118 }
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119 if (desc != null) {
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120 return desc;
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121 }
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122 }
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123 } catch (IOException e) {
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124 throw new InternalError("Error reading " + path, e);
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125 }
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126 }
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127 return null;
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128 }
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129 }