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1
21 package com.db4o.util.io.win32;
22
23 import java.io.File  ;
24 import java.io.IOException ;
25
26 import com.db4o.io.IoAdapter;
27
28
31 public class Win32IoAdapter extends IoAdapter {
32
33 static {
34 System.loadLibrary("Win32IoAdapter");
35 }
36
37 private long _handle;
38
39 public Win32IoAdapter(String path, boolean lockFile, long initialLength) {
40 _handle = openFile(path, lockFile, initialLength);
41 }
42
43 public Win32IoAdapter() {
44 }
45
46 public void close() throws IOException {
47 closeFile(getHandle());
48 _handle = 0;
49 }
50
51 public void delete(String path) {
52 new File (path).delete();
53 }
54
55 public boolean exists(String path){
56 File existingFile = new File (path);
57 return existingFile.exists() && existingFile.length() > 0;
58 }
59
60 public long getLength() throws IOException {
61 return getLength(getHandle());
62 }
63
64 public IoAdapter open(String path, boolean lockFile, long initialLength)
65 throws IOException {
66 return new Win32IoAdapter(path, lockFile, initialLength);
67 }
68
69 public int read(byte[] bytes, int length) throws IOException {
70 return read(getHandle(), bytes, length);
71 }
72
73 public void seek(long pos) throws IOException {
74 seek(getHandle(), pos);
75 }
76
77 public void sync() throws IOException {
78 sync(getHandle());
79 }
80
81 public void write(byte[] bytes, int length) throws IOException {
82 write(getHandle(), bytes, length);
83 }
84
85 public void copy(long oldAddress, long newAddress, int length)
86 throws IOException {
87 copy(getHandle(), oldAddress, newAddress, length);
88 }
89
90 private long getHandle() {
91 if (0 == _handle) {
92 throw new IllegalStateException ("File is not open.");
93 }
94 return _handle;
95 }
96
97 private static native long openFile(String path, boolean lockFile, long initialLength);
98
99 private static native void closeFile(long handle);
100
101 private static native long getLength(long handle);
102
103 private static native int read(long handle, byte[] bytes, int length);
104
105 private static native void seek(long handle, long pos);
106
107 private static native void sync(long handle);
108
109 private static native void write(long handle, byte[] bytes, int lenght);
110
111 private static native void copy(long handle, long oldAddress, long newAddress, int length);
112 }
113 |
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