41 import java.nio.file.FileSystem;
42 import java.nio.file.FileSystemException;
43 import java.nio.file.InvalidPathException;
44 import java.nio.file.LinkOption;
45 import java.nio.file.NoSuchFileException;
46 import java.nio.file.NotDirectoryException;
47 import java.nio.file.OpenOption;
48 import java.nio.file.Path;
49 import java.nio.file.PathMatcher;
50 import java.nio.file.ReadOnlyFileSystemException;
51 import java.nio.file.StandardOpenOption;
52 import java.nio.file.WatchService;
53 import java.nio.file.attribute.FileAttribute;
54 import java.nio.file.attribute.FileTime;
55 import java.nio.file.attribute.UserPrincipalLookupService;
56 import java.nio.file.spi.FileSystemProvider;
57 import java.util.Arrays;
58 import java.util.Collections;
59 import java.util.HashSet;
60 import java.util.Iterator;
61 import java.util.Map;
62 import java.util.Objects;
63 import java.util.Set;
64 import java.util.regex.Pattern;
65 import jdk.internal.jimage.ImageReader.Node;
66
67 /**
68 * jrt file system implementation built on System jimage files.
69 *
70 * @implNote This class needs to maintain JDK 8 source compatibility.
71 *
72 * It is used internally in the JDK to implement jimage/jrtfs access,
73 * but also compiled and delivered as part of the jrtfs.jar to support access
74 * to the jimage file provided by the shipped JDK by tools running on JDK 8.
75 */
76 class JrtFileSystem extends FileSystem {
77
78 private final JrtFileSystemProvider provider;
79 private final JrtPath rootPath = new JrtPath(this, "/");
80 private volatile boolean isOpen;
81 private volatile boolean isClosable;
82 private SystemImage image;
83
84 JrtFileSystem(JrtFileSystemProvider provider, Map<String, ?> env)
85 throws IOException
86 {
87 this.provider = provider;
88 this.image = SystemImage.open(); // open image file
89 this.isOpen = true;
90 this.isClosable = env != null;
91 }
92
93 // FileSystem method implementations
94 @Override
95 public boolean isOpen() {
96 return isOpen;
97 }
98
99 @Override
100 public void close() throws IOException {
101 if (!isClosable)
102 throw new UnsupportedOperationException();
103 cleanup();
104 }
105
106 @Override
107 public FileSystemProvider provider() {
108 return provider;
109 }
110
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41 import java.nio.file.FileSystem;
42 import java.nio.file.FileSystemException;
43 import java.nio.file.InvalidPathException;
44 import java.nio.file.LinkOption;
45 import java.nio.file.NoSuchFileException;
46 import java.nio.file.NotDirectoryException;
47 import java.nio.file.OpenOption;
48 import java.nio.file.Path;
49 import java.nio.file.PathMatcher;
50 import java.nio.file.ReadOnlyFileSystemException;
51 import java.nio.file.StandardOpenOption;
52 import java.nio.file.WatchService;
53 import java.nio.file.attribute.FileAttribute;
54 import java.nio.file.attribute.FileTime;
55 import java.nio.file.attribute.UserPrincipalLookupService;
56 import java.nio.file.spi.FileSystemProvider;
57 import java.util.Arrays;
58 import java.util.Collections;
59 import java.util.HashSet;
60 import java.util.Iterator;
61 import java.util.Objects;
62 import java.util.Set;
63 import java.util.regex.Pattern;
64 import jdk.internal.jimage.ImageReader.Node;
65 import jdk.internal.jimage.PreviewMode;
66
67 /**
68 * jrt file system implementation built on System jimage files.
69 *
70 * @implNote This class needs to maintain JDK 8 source compatibility.
71 *
72 * It is used internally in the JDK to implement jimage/jrtfs access,
73 * but also compiled and delivered as part of the jrtfs.jar to support access
74 * to the jimage file provided by the shipped JDK by tools running on JDK 8.
75 */
76 class JrtFileSystem extends FileSystem {
77
78 private final JrtFileSystemProvider provider;
79 private final JrtPath rootPath = new JrtPath(this, "/");
80 private volatile boolean isOpen;
81 private volatile boolean isClosable;
82 private SystemImage image;
83
84 /**
85 * Special constructor for the singleton system jrt file system. This creates
86 * a non-closable instance, and should only be called once by {@link
87 * JrtFileSystemProvider}.
88 *
89 * @param provider the provider opening the file system.
90 */
91 JrtFileSystem(JrtFileSystemProvider provider)
92 throws IOException {
93 this.provider = provider;
94 this.image = SystemImage.open(PreviewMode.FOR_RUNTIME); // open image file
95 this.isOpen = true;
96 // Only the system singleton jrt file system is "unclosable".
97 this.isClosable = false;
98 }
99
100 /**
101 * Creates a new, non-system, instance of the jrt file system.
102 *
103 * @param provider the provider opening the file system.
104 * @param mode controls whether preview resources are visible.
105 */
106 JrtFileSystem(JrtFileSystemProvider provider, PreviewMode mode)
107 throws IOException {
108 this.provider = provider;
109 this.image = SystemImage.open(mode); // open image file
110 this.isOpen = true;
111 this.isClosable = true;
112 }
113
114 // FileSystem method implementations
115 @Override
116 public boolean isOpen() {
117 return isOpen;
118 }
119
120 @Override
121 public void close() throws IOException {
122 if (!isClosable)
123 throw new UnsupportedOperationException();
124 cleanup();
125 }
126
127 @Override
128 public FileSystemProvider provider() {
129 return provider;
130 }
131
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