1 /* 2 * Copyright (C) 2010 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef AsyncFileSystem_h 32 #define AsyncFileSystem_h 33 34 #if ENABLE(FILE_SYSTEM) 35 36 #include "PlatformString.h" 37 #include "Timer.h" 38 #include <wtf/PassOwnPtr.h> 39 40 namespace WebCore { 41 42 class AsyncFileSystem; 43 class AsyncFileSystemCallbacks; 44 class AsyncFileWriterClient; 45 46 // This class provides async interface for platform-specific file system implementation. Note that all the methods take platform paths. 47 class AsyncFileSystem { 48 WTF_MAKE_NONCOPYABLE(AsyncFileSystem); 49 public: 50 virtual ~AsyncFileSystem() { } 51 52 // FileSystem type 53 enum Type { 54 Temporary, 55 Persistent, 56 External, 57 }; 58 59 virtual void stop() { } 60 virtual bool hasPendingActivity() { return false; } 61 62 static bool isAvailable(); 63 64 // Subclass must implement this if it supports synchronous operations. 65 // This should return false if there are no pending operations. 66 virtual bool waitForOperationToComplete() { return false; } 67 68 // Creates and returns a new platform-specific AsyncFileSystem instance if the platform has its own implementation. 69 static PassOwnPtr<AsyncFileSystem> create(Type, const String& rootPath); 70 71 // Opens a new file system. The create parameter specifies whether or not to create the path if it does not already exists. 72 static void openFileSystem(const String& basePath, const String& storageIdentifier, Type, bool create, PassOwnPtr<AsyncFileSystemCallbacks>); 73 74 // Moves a file or directory from srcPath to destPath. 75 // AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully. 76 // AsyncFileSystemCallbacks::didFail() is called otherwise. 77 virtual void move(const String& srcPath, const String& destPath, PassOwnPtr<AsyncFileSystemCallbacks>) = 0; 78 79 // Copies a file or directory from srcPath to destPath. 80 // AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully. 81 // AsyncFileSystemCallbacks::didFail() is called otherwise. 82 virtual void copy(const String& srcPath, const String& destPath, PassOwnPtr<AsyncFileSystemCallbacks>) = 0; 83 84 // Deletes a file or directory at a given path. 85 // It is an error to try to remove a directory that is not empty. 86 // AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully. 87 // AsyncFileSystemCallbacks::didFail() is called otherwise. 88 virtual void remove(const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0; 89 90 // Recursively deletes a directory at a given path. 91 // AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully. 92 // AsyncFileSystemCallbacks::didFail() is called otherwise. 93 virtual void removeRecursively(const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0; 94 95 // Retrieves the metadata information of the file or directory at a given path. 96 // AsyncFileSystemCallbacks::didReadMetadata() is called when the operation is completed successfully. 97 // AsyncFileSystemCallbacks::didFail() is called otherwise. 98 virtual void readMetadata(const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0; 99 100 // Creates a file at a given path. If exclusive flag is true, it fails if the path already exists. 101 // AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully. 102 // AsyncFileSystemCallbacks::didFail() is called otherwise. 103 virtual void createFile(const String& path, bool exclusive, PassOwnPtr<AsyncFileSystemCallbacks>) = 0; 104 105 // Creates a directory at a given path. If exclusive flag is true, it fails if the path already exists. 106 // AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully. 107 // AsyncFileSystemCallbacks::didFail() is called otherwise. 108 virtual void createDirectory(const String& path, bool exclusive, PassOwnPtr<AsyncFileSystemCallbacks>) = 0; 109 110 // Checks if a file exists at a given path. 111 // AsyncFileSystemCallbacks::didSucceed() is called if the file exists. 112 // AsyncFileSystemCallbacks::didFail() is called otherwise. 113 virtual void fileExists(const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0; 114 115 // Checks if a directory exists at a given path. 116 // AsyncFileSystemCallbacks::didSucceed() is called if the directory exists. 117 // AsyncFileSystemCallbacks::didFail() is called otherwise. 118 virtual void directoryExists(const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0; 119 120 // Reads directory entries of a given directory at path. 121 // AsyncFileSystemCallbacks::didReadDirectoryEntry() is called when each directory entry is called. AsyncFileSystemCallbacks::didReadDirectoryEntries() is called after a chunk of directory entries have been read. 122 // AsyncFileSystemCallbacks::didFail() is when there is an error. 123 virtual void readDirectory(const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0; 124 125 // Creates an AsyncFileWriter for a given file path. 126 // AsyncFileSystemCallbacks::didCreateFileWriter() is called when an AsyncFileWriter is created successfully. 127 // AsyncFileSystemCallbacks::didFail() is called otherwise. 128 virtual void createWriter(AsyncFileWriterClient* client, const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0; 129 130 // Converts a given absolute virtual path to a platform path that starts with the platform root path of this file system. 131 virtual String virtualToPlatformPath(const String& path) const; 132 133 // Getter for this file system's root path. 134 String root() const { return m_platformRootPath; } 135 136 Type type() const { return m_type; } 137 138 protected: 139 AsyncFileSystem(Type type, const String& platformRootPath) 140 : m_type(type) 141 , m_platformRootPath(platformRootPath) 142 { 143 } 144 145 Type m_type; 146 String m_platformRootPath; 147 }; 148 149 } // namespace WebCore 150 151 #endif // ENABLE(FILE_SYSTEM) 152 153 #endif // AsyncFileSystem_h 154
