import org.hsqldb.lib.Storage; //导入依赖的package包/类
RAShadowFile(Database database, Storage source, String pathName,
             long maxSize, int pageSize) {

    this.database = database;
    this.pathName = pathName;
    this.source   = source;
    this.pageSize = pageSize;
    this.maxSize  = maxSize;

    int bitSize = (int) (maxSize / pageSize);

    if (maxSize % pageSize != 0) {
        bitSize++;
    }

    bitMap = new BitMap(bitSize);
}
 

import org.hsqldb.lib.Storage; //导入依赖的package包/类
RAStorageWrapper(Storage virtualFile)
                       throws IOException {
    this.file = virtualFile;
}
 

import org.hsqldb.lib.Storage; //导入依赖的package包/类
RAStorageWrapper(Storage virtualFile)
                       throws FileNotFoundException, IOException {
    this.file = virtualFile;
}