WebCore/platform/sql/SQLiteFileSystem.cpp

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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 * in the documentation and/or other materials provided with the
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 * 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
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#include "config.h"
#include "SQLiteFileSystem.h"

#include "FileSystem.h"
#include "SQLiteDatabase.h"
#include "SQLiteStatement.h"
#include <sqlite3.h>

namespace WebCore {

SQLiteFileSystem::SQLiteFileSystem()
{
}

void SQLiteFileSystem::registerSQLiteVFS()
{
}

int SQLiteFileSystem::openDatabase(const String& fileName, sqlite3** database)
{
    // SQLite expects a null terminator on its UTF-16 strings.
    String path = fileName;
    return sqlite3_open16(path.charactersWithNullTermination(), database);
}

String SQLiteFileSystem::getFileNameForNewDatabase(const String& dbDir, const String&,
                                                   const String&, SQLiteDatabase* db)
{
    // try to get the next sequence number from the given database
    // if we can't get a number, return an empty string
    SQLiteStatement sequenceStatement(*db, "SELECT seq FROM sqlite_sequence WHERE name='Databases';");
    if (sequenceStatement.prepare() != SQLResultOk)
        return String();
    int result = sequenceStatement.step();
    int64_t seq = 0;
    if (result == SQLResultRow)
        seq = sequenceStatement.getColumnInt64(0);
    else if (result != SQLResultDone)
        return String();
    sequenceStatement.finalize();

    // increment the number until we can use it to form a file name that doesn't exist
    String fileName;
    do {
        ++seq;
        fileName = pathByAppendingComponent(dbDir, String::format("%016llx.db", seq));
    } while (fileExists(fileName));

    return String::format("%016llx.db", seq);
}

String SQLiteFileSystem::appendDatabaseFileNameToPath(const String& path, const String& fileName)
{
    return pathByAppendingComponent(path, fileName);
}

bool SQLiteFileSystem::ensureDatabaseDirectoryExists(const String& path)
{
    if (path.isEmpty())
        return false;
    return makeAllDirectories(path);
}

bool SQLiteFileSystem::ensureDatabaseFileExists(const String& fileName, bool checkPathOnly)
{
    if (fileName.isEmpty())
        return false;

    if (checkPathOnly) {
        String dir = directoryName(fileName);
        return ensureDatabaseDirectoryExists(dir);
    }

    return fileExists(fileName);
}

bool SQLiteFileSystem::deleteEmptyDatabaseDirectory(const String& path)
{
    return deleteEmptyDirectory(path);
}

bool SQLiteFileSystem::deleteDatabaseFile(const String& fileName)
{
    return deleteFile(fileName);
}

long long SQLiteFileSystem::getDatabaseFileSize(const String& fileName)
{        
    long long size;
    return getFileSize(fileName, size) ? size : 0;
}

} // namespace WebCore