22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package jdk.internal.jrtfs;
26
27 import java.io.IOException;
28 import java.net.URISyntaxException;
29 import java.net.URL;
30 import java.nio.file.Files;
31 import java.nio.file.FileSystem;
32 import java.nio.file.FileSystems;
33 import java.nio.file.FileSystemNotFoundException;
34 import java.nio.file.Path;
35 import java.nio.file.Paths;
36 import java.security.AccessController;
37 import java.security.CodeSource;
38 import java.security.PrivilegedAction;
39
40 import jdk.internal.jimage.ImageReader;
41 import jdk.internal.jimage.ImageReader.Node;
42
43 /**
44 * @implNote This class needs to maintain JDK 8 source compatibility.
45 *
46 * It is used internally in the JDK to implement jimage/jrtfs access,
47 * but also compiled and delivered as part of the jrtfs.jar to support access
48 * to the jimage file provided by the shipped JDK by tools running on JDK 8.
49 */
50 @SuppressWarnings({ "removal", "suppression"} )
51 abstract class SystemImage {
52
53 abstract Node findNode(String path) throws IOException;
54 abstract byte[] getResource(Node node) throws IOException;
55 abstract void close() throws IOException;
56
57 static SystemImage open() throws IOException {
58 if (modulesImageExists) {
59 // open a .jimage and build directory structure
60 final ImageReader image = ImageReader.open(moduleImageFile);
61 return new SystemImage() {
62 @Override
63 Node findNode(String path) throws IOException {
64 return image.findNode(path);
65 }
66 @Override
67 byte[] getResource(Node node) throws IOException {
68 return image.getResource(node);
69 }
70 @Override
71 void close() throws IOException {
72 image.close();
73 }
74 };
75 }
76 if (Files.notExists(explodedModulesDir))
77 throw new FileSystemNotFoundException(explodedModulesDir.toString());
78 return new ExplodedImage(explodedModulesDir);
79 }
80
81 private static final String RUNTIME_HOME;
82 // "modules" jimage file Path
83 private static final Path moduleImageFile;
84 // "modules" jimage exists or not?
85 private static final boolean modulesImageExists;
86 // <JAVA_HOME>/modules directory Path
87 private static final Path explodedModulesDir;
88
89 static {
90 PrivilegedAction<String> pa = SystemImage::findHome;
91 RUNTIME_HOME = AccessController.doPrivileged(pa);
92
93 FileSystem fs = FileSystems.getDefault();
94 moduleImageFile = fs.getPath(RUNTIME_HOME, "lib", "modules");
95 explodedModulesDir = fs.getPath(RUNTIME_HOME, "modules");
96
97 modulesImageExists = AccessController.doPrivileged(
98 new PrivilegedAction<Boolean>() {
|
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package jdk.internal.jrtfs;
26
27 import java.io.IOException;
28 import java.net.URISyntaxException;
29 import java.net.URL;
30 import java.nio.file.Files;
31 import java.nio.file.FileSystem;
32 import java.nio.file.FileSystems;
33 import java.nio.file.FileSystemNotFoundException;
34 import java.nio.file.Path;
35 import java.nio.file.Paths;
36 import java.security.AccessController;
37 import java.security.CodeSource;
38 import java.security.PrivilegedAction;
39
40 import jdk.internal.jimage.ImageReader;
41 import jdk.internal.jimage.ImageReader.Node;
42 import jdk.internal.jimage.PreviewMode;
43
44 /**
45 * @implNote This class needs to maintain JDK 8 source compatibility.
46 *
47 * It is used internally in the JDK to implement jimage/jrtfs access,
48 * but also compiled and delivered as part of the jrtfs.jar to support access
49 * to the jimage file provided by the shipped JDK by tools running on JDK 8.
50 */
51 @SuppressWarnings({"removal", "suppression"})
52 public abstract class SystemImage implements AutoCloseable {
53
54 public abstract Node findNode(String path) throws IOException;
55 public abstract byte[] getResource(Node node) throws IOException;
56 public abstract void close() throws IOException;
57
58 /**
59 * Opens the system image for the current runtime.
60 *
61 * @param mode determines whether preview mode should be enabled.
62 * @return a new system image based on either the jimage file or an "exploded"
63 * modules directory, according to the build state.
64 */
65 public static SystemImage open(PreviewMode mode) throws IOException {
66 return modulesImageExists ? fromJimage(moduleImageFile, mode) : fromDirectory(explodedModulesDir, mode);
67 }
68
69 /** Internal factory method for testing only, use {@link SystemImage#open(PreviewMode)}. */
70 public static SystemImage fromJimage(Path path, PreviewMode mode) throws IOException {
71 final ImageReader image = ImageReader.open(path, mode);
72 return new SystemImage() {
73 @Override
74 public Node findNode(String path) throws IOException {
75 return image.findNode(path);
76 }
77 @Override
78 public byte[] getResource(Node node) throws IOException {
79 return image.getResource(node);
80 }
81 @Override
82 public void close() throws IOException {
83 image.close();
84 }
85 };
86 }
87
88 /** Internal factory method for testing only, use {@link SystemImage#open(PreviewMode)}. */
89 public static SystemImage fromDirectory(Path modulesDir, PreviewMode mode) throws IOException {
90 if (!Files.isDirectory(modulesDir)) {
91 throw new FileSystemNotFoundException(modulesDir.toString());
92 }
93 return new ExplodedImage(modulesDir, mode.isPreviewModeEnabled());
94 }
95
96 private static final String RUNTIME_HOME;
97 // "modules" jimage file Path
98 private static final Path moduleImageFile;
99 // "modules" jimage exists or not?
100 private static final boolean modulesImageExists;
101 // <JAVA_HOME>/modules directory Path
102 private static final Path explodedModulesDir;
103
104 static {
105 PrivilegedAction<String> pa = SystemImage::findHome;
106 RUNTIME_HOME = AccessController.doPrivileged(pa);
107
108 FileSystem fs = FileSystems.getDefault();
109 moduleImageFile = fs.getPath(RUNTIME_HOME, "lib", "modules");
110 explodedModulesDir = fs.getPath(RUNTIME_HOME, "modules");
111
112 modulesImageExists = AccessController.doPrivileged(
113 new PrivilegedAction<Boolean>() {
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