41 import java.nio.file.Path;
42 import java.nio.file.Paths;
43 import java.util.ArrayList;
44 import java.util.Collections;
45 import java.util.HashMap;
46 import java.util.HashSet;
47 import java.util.List;
48 import java.util.Map;
49 import java.util.Optional;
50 import java.util.Set;
51 import java.util.jar.JarEntry;
52 import java.util.jar.JarFile;
53
54 import jdk.internal.loader.Resource;
55 import jdk.internal.misc.JavaLangModuleAccess;
56 import jdk.internal.misc.SharedSecrets;
57 import sun.net.www.ParseUtil;
58
59
60 /**
61 * Provides support for patching modules in the boot layer with -Xpatch.
62 */
63
64 public final class ModulePatcher {
65
66 private static final JavaLangModuleAccess JLMA
67 = SharedSecrets.getJavaLangModuleAccess();
68
69 // the prefix of the system properties that encode the value of -Xpatch
70 private static final String PATCH_PROPERTY_PREFIX = "jdk.launcher.patch.";
71
72 // module name -> sequence of patches (directories or JAR files)
73 private static final Map<String, List<Path>> PATCH_MAP = decodeProperties();
74
75 private ModulePatcher() { }
76
77
78 /**
79 * Decodes the values of -Xpatch options, returning a Map of module name to
80 * list of file paths.
81 *
82 * @throws IllegalArgumentException if the the module name is missing or
83 * -Xpatch is used more than once to patch the same module
84 */
85 private static Map<String, List<Path>> decodeProperties() {
86
87 int index = 0;
88 String value = System.getProperty(PATCH_PROPERTY_PREFIX + index);
89 if (value == null)
90 return Collections.emptyMap(); // -Xpatch not specified
91
92 Map<String, List<Path>> map = new HashMap<>();
93 while (value != null) {
94
95 // <module>=<file>(:<file>)*
96
97 int pos = value.indexOf('=');
98 if (pos == -1)
99 throwIAE("Unable to parse: " + value);
100 if (pos == 0)
101 throwIAE("Missing module name: " + value);
102
103 String mn = value.substring(0, pos);
104 List<Path> list = map.get(mn);
105 if (list != null)
106 throwIAE("Module " + mn + " specified more than once");
107 list = new ArrayList<>();
108 map.put(mn, list);
109
110 String paths = value.substring(pos+1);
111 for (String path : paths.split(File.pathSeparator)) {
112 if (!path.isEmpty()) {
113 list.add(Paths.get(path));
114 }
115 }
116
117 index++;
118 value = System.getProperty(PATCH_PROPERTY_PREFIX + index);
119 }
120
121 return map;
122 }
123
124
125 /**
126 * Returns a module reference that interposes on the given module if
127 * needed. If there are no patches for the given module then the module
128 * reference is simply returned. Otherwise the patches for the module
129 * are scanned (to find any new concealed packages) and a new module
130 * reference is returned.
131 *
132 * @throws UncheckedIOException if an I/O error is detected
133 */
134 public static ModuleReference interposeIfNeeded(ModuleReference mref) {
135
136 ModuleDescriptor descriptor = mref.descriptor();
137 String mn = descriptor.name();
138
139 // if there are no patches for the module then nothing to do
140 List<Path> paths = PATCH_MAP.get(mn);
141 if (paths == null)
142 return mref;
143
144
145 // scan the JAR file or directory tree to get the set of packages
520 }
521 };
522 }
523 }
524
525
526 /**
527 * Derives a package name from a file path to a .class file.
528 */
529 private static String toPackageName(Path top, Path file) {
530 Path entry = top.relativize(file);
531 Path parent = entry.getParent();
532 if (parent == null) {
533 return warnUnnamedPackage(top, entry.toString());
534 } else {
535 return parent.toString().replace(File.separatorChar, '.');
536 }
537 }
538
539 /**
540 * Derives a package name from the name of an entry in a JAR file.
541 */
542 private static String toPackageName(Path file, JarEntry entry) {
543 String name = entry.getName();
544 int index = name.lastIndexOf("/");
545 if (index == -1) {
546 return warnUnnamedPackage(file, name);
547 } else {
548 return name.substring(0, index).replace('/', '.');
549 }
550 }
551
552 private static String warnUnnamedPackage(Path file, String e) {
553 System.err.println("WARNING: " + e + " not allowed in patch: " + file);
554 return "";
555 }
556
557 private static void throwIAE(String msg) {
558 throw new IllegalArgumentException(msg);
559 }
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41 import java.nio.file.Path;
42 import java.nio.file.Paths;
43 import java.util.ArrayList;
44 import java.util.Collections;
45 import java.util.HashMap;
46 import java.util.HashSet;
47 import java.util.List;
48 import java.util.Map;
49 import java.util.Optional;
50 import java.util.Set;
51 import java.util.jar.JarEntry;
52 import java.util.jar.JarFile;
53
54 import jdk.internal.loader.Resource;
55 import jdk.internal.misc.JavaLangModuleAccess;
56 import jdk.internal.misc.SharedSecrets;
57 import sun.net.www.ParseUtil;
58
59
60 /**
61 * Provides support for patching modules in the boot layer with --patch-module.
62 */
63
64 public final class ModulePatcher {
65
66 private static final JavaLangModuleAccess JLMA
67 = SharedSecrets.getJavaLangModuleAccess();
68
69 // the prefix of the system properties that encode the value of --patch-module
70 private static final String PATCH_PROPERTY_PREFIX = "jdk.module.patch.";
71
72 // module name -> sequence of patches (directories or JAR files)
73 private static final Map<String, List<Path>> PATCH_MAP = decodeProperties();
74
75 private ModulePatcher() { }
76
77 /**
78 * Decodes the values of --patch-module options, returning a Map of module
79 * name to list of file paths.
80 *
81 * @throws IllegalArgumentException if the the module name is missing or
82 * --patch-module is used more than once to patch the same module
83 */
84 private static Map<String, List<Path>> decodeProperties() {
85
86 int index = 0;
87 String value = getAndRemoveProperty(PATCH_PROPERTY_PREFIX + index);
88 if (value == null)
89 return Collections.emptyMap(); // --patch-module not specified
90
91 Map<String, List<Path>> map = new HashMap<>();
92 while (value != null) {
93
94 // <module>=<file>(:<file>)*
95
96 int pos = value.indexOf('=');
97 if (pos == -1)
98 throwIAE("Unable to parse: " + value);
99 if (pos == 0)
100 throwIAE("Missing module name: " + value);
101
102 String mn = value.substring(0, pos);
103 List<Path> list = map.get(mn);
104 if (list != null)
105 throwIAE("Module " + mn + " specified more than once");
106 list = new ArrayList<>();
107 map.put(mn, list);
108
109 String paths = value.substring(pos+1);
110 for (String path : paths.split(File.pathSeparator)) {
111 if (!path.isEmpty()) {
112 list.add(Paths.get(path));
113 }
114 }
115
116 index++;
117 value = getAndRemoveProperty(PATCH_PROPERTY_PREFIX + index);
118 }
119
120 return map;
121 }
122
123
124 /**
125 * Returns {@code true} is --patch-module is specified to patch modules
126 * in the boot layer.
127 */
128 static boolean isBootLayerPatched() {
129 return !PATCH_MAP.isEmpty();
130 }
131
132 /**
133 * Returns a module reference that interposes on the given module if
134 * needed. If there are no patches for the given module then the module
135 * reference is simply returned. Otherwise the patches for the module
136 * are scanned (to find any new concealed packages) and a new module
137 * reference is returned.
138 *
139 * @throws UncheckedIOException if an I/O error is detected
140 */
141 public static ModuleReference interposeIfNeeded(ModuleReference mref) {
142
143 ModuleDescriptor descriptor = mref.descriptor();
144 String mn = descriptor.name();
145
146 // if there are no patches for the module then nothing to do
147 List<Path> paths = PATCH_MAP.get(mn);
148 if (paths == null)
149 return mref;
150
151
152 // scan the JAR file or directory tree to get the set of packages
527 }
528 };
529 }
530 }
531
532
533 /**
534 * Derives a package name from a file path to a .class file.
535 */
536 private static String toPackageName(Path top, Path file) {
537 Path entry = top.relativize(file);
538 Path parent = entry.getParent();
539 if (parent == null) {
540 return warnUnnamedPackage(top, entry.toString());
541 } else {
542 return parent.toString().replace(File.separatorChar, '.');
543 }
544 }
545
546 /**
547 * Gets and remove the named system property
548 */
549 private static String getAndRemoveProperty(String key) {
550 return (String)System.getProperties().remove(key);
551 }
552
553 /**
554 * Derives a package name from the name of an entry in a JAR file.
555 */
556 private static String toPackageName(Path file, JarEntry entry) {
557 String name = entry.getName();
558 int index = name.lastIndexOf("/");
559 if (index == -1) {
560 return warnUnnamedPackage(file, name);
561 } else {
562 return name.substring(0, index).replace('/', '.');
563 }
564 }
565
566 private static String warnUnnamedPackage(Path file, String e) {
567 System.err.println("WARNING: " + e + " not allowed in patch: " + file);
568 return "";
569 }
570
571 private static void throwIAE(String msg) {
572 throw new IllegalArgumentException(msg);
573 }
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