1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef AsyncFileSystem_h
#define AsyncFileSystem_h
#if ENABLE(FILE_SYSTEM)
#include "FileSystemType.h"
#include "KURL.h"
#include "Timer.h"
#include <wtf/PassOwnPtr.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class AsyncFileSystem;
class AsyncFileSystemCallbacks;
class AsyncFileWriterClient;
// This class provides async interface for platform-specific file system implementation. Note that all the methods take platform paths.
class AsyncFileSystem {
WTF_MAKE_NONCOPYABLE(AsyncFileSystem);
public:
virtual ~AsyncFileSystem() { }
virtual void stop() { }
virtual bool hasPendingActivity() { return false; }
static bool isAvailable();
// Subclass must implement this if it supports synchronous operations.
// This should return false if there are no pending operations.
virtual bool waitForOperationToComplete() { return false; }
// Creates and returns a new platform-specific AsyncFileSystem instance if the platform has its own implementation.
static PassOwnPtr<AsyncFileSystem> create();
// Opens a new file system. The create parameter specifies whether or not to create the path if it does not already exists.
// FIXME: Add FileSystemType parameter.
static void openFileSystem(const String& basePath, const String& storageIdentifier, bool create, PassOwnPtr<AsyncFileSystemCallbacks>);
// Deletes the file system.
static void deleteFileSystem(const String& basePath, const String& storageIdentifier, FileSystemType, PassOwnPtr<AsyncFileSystemCallbacks>);
// Moves a file or directory from srcPath to destPath.
// AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully.
// AsyncFileSystemCallbacks::didFail() is called otherwise.
virtual void move(const KURL& srcPath, const KURL& destPath, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
// Copies a file or directory from srcPath to destPath.
// AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully.
// AsyncFileSystemCallbacks::didFail() is called otherwise.
virtual void copy(const KURL& srcPath, const KURL& destPath, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
// Deletes a file or directory at a given path.
// It is an error to try to remove a directory that is not empty.
// AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully.
// AsyncFileSystemCallbacks::didFail() is called otherwise.
virtual void remove(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
// Recursively deletes a directory at a given path.
// AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully.
// AsyncFileSystemCallbacks::didFail() is called otherwise.
virtual void removeRecursively(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
// Retrieves the metadata information of the file or directory at a given path.
// AsyncFileSystemCallbacks::didReadMetadata() is called when the operation is completed successfully.
// AsyncFileSystemCallbacks::didFail() is called otherwise.
virtual void readMetadata(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
// Creates a file at a given path. If exclusive flag is true, it fails if the path already exists.
// AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully.
// AsyncFileSystemCallbacks::didFail() is called otherwise.
virtual void createFile(const KURL& path, bool exclusive, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
// Creates a directory at a given path. If exclusive flag is true, it fails if the path already exists.
// AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully.
// AsyncFileSystemCallbacks::didFail() is called otherwise.
virtual void createDirectory(const KURL& path, bool exclusive, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
// Checks if a file exists at a given path.
// AsyncFileSystemCallbacks::didSucceed() is called if the file exists.
// AsyncFileSystemCallbacks::didFail() is called otherwise.
virtual void fileExists(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
// Checks if a directory exists at a given path.
// AsyncFileSystemCallbacks::didSucceed() is called if the directory exists.
// AsyncFileSystemCallbacks::didFail() is called otherwise.
virtual void directoryExists(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
// Reads directory entries of a given directory at path.
// AsyncFileSystemCallbacks::didReadDirectoryEntry() is called when each directory entry is called. AsyncFileSystemCallbacks::didReadDirectoryEntries() is called after a chunk of directory entries have been read.
// AsyncFileSystemCallbacks::didFail() is when there is an error.
virtual void readDirectory(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
// Creates an AsyncFileWriter for a given file path.
// AsyncFileSystemCallbacks::didCreateFileWriter() is called when an AsyncFileWriter is created successfully.
// AsyncFileSystemCallbacks::didFail() is called otherwise.
virtual void createWriter(AsyncFileWriterClient*, const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
// Creates a snapshot file and read its metadata for a new File object.
// In local filesystem cases the backend may simply return the metadata of the file itself (as well as readMetadata does),
// while in remote filesystem case the backend may download the file into a temporary snapshot file and return the metadata of the temporary file.
// AsyncFileSystemCallbacks::didReadMetadata() is called when the metadata for the snapshot file is successfully returned.
// AsyncFileSystemCallbacks::didFail() is called otherwise.
//
// Note: the returned metadata info is cached in the File object for non-regular filesystem types (neither Temporary nor Persistent). The port could return valid metadata if it wants File object to cache metadata (e.g. if the file body is on a remote server), but otherwise should NOT return valid metadata.
virtual void createSnapshotFileAndReadMetadata(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
protected:
AsyncFileSystem() { }
};
} // namespace WebCore
#endif // ENABLE(FILE_SYSTEM)
#endif // AsyncFileSystem_h
|
