tech.tablesaw.store

Class StorageManager

java.lang.Object

tech.tablesaw.store.StorageManager

public class StorageManager
extends Object

A controller for reading and writing data in Tablesaw's own compressed, column-oriented file format

Constructor Summary

Constructors

Constructor and Description
StorageManager()

Method Summary

Modifier and Type	Method and Description
static Table	readTable(String path) Reads a tablesaw table into memory
static String	saveTable(String folderName, Relation table) Saves the data from the given table in the location specified by folderName.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StorageManager

public StorageManager()

Method Detail

readTable

public static Table readTable(String path)
                       throws IOException

Reads a tablesaw table into memory

Parameters:

path - The location of the table. It is interpreted as relative to the working directory if not fully specified. The path will typically end in ".saw", as in "mytables/nasdaq-2015.saw"

Throws:

IOException - if the file cannot be read

saveTable

public static String saveTable(String folderName,
                               Relation table)
                        throws IOException

Saves the data from the given table in the location specified by folderName. Within that folder each table has its own sub-folder, whose name is based on the name of the table.

NOTE: If you store a table with the same name in the same folder. The data in that folder will be over-written.

The storage format is the tablesaw compressed column-oriented format, which consists of a set of file in a folder. The name of the folder is based on the name of the table.

Parameters:

folderName - The location of the table (for example: "mytables")

table - The table to be saved

Returns:

The path and name of the table

Throws:

IOException - IOException if the file can not be read