de.unknownreality.dataframe

Class DataFrameLoader

java.lang.Object

de.unknownreality.dataframe.DataFrameLoader

public class DataFrameLoader
extends Object

Created by Alex on 08.06.2016.

Method Summary

Modifier and Type	Method and Description
static Map<String,DataFrameColumn>	createColumns(DataFrameMeta dataFrameMeta) Creates the columns from a data frame meta information
static DataFrame	load(File file) Loads a data frame from a file.
static DataFrame	load(File file, File metaFile) Loads a data frame from a file and the corresponding meta file.
static DataFrame	load(File file, File metaFile, FilterPredicate filterPredicate) Loads a data frame from a file and the corresponding meta file.
static DataFrame	load(File file, FilterPredicate filterPredicate) Loads a data frame from a file.
static DataFrame	loadResource(String path, String metaPath, ClassLoader classLoader) Loads a data frame from a resource and the corresponding meta resource.
static DataFrame	loadResource(String path, String metaPath, ClassLoader classLoader, FilterPredicate filterPredicate) Loads a data frame from a resource and the corresponding meta resource.

Methods inherited from class java.lang.Object

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

Method Detail

load

public static DataFrame load(File file,
                             FilterPredicate filterPredicate)
                      throws DataFrameException

Loads a data frame from a file. The matching data frame meta file must be present. Only rows validated by the filter are appended to the resulting data frame file+'.dfm'

Parameters:

file - data frame file

filterPredicate - row filter

Returns:

loaded data frame

Throws:

DataFrameException - thrown if the data frame can not be loaded

load

public static DataFrame load(File file)
                      throws DataFrameException

Loads a data frame from a file. The matching data frame meta file must be present. file+'.dfm'

Parameters:

file - data frame file

Returns:

loaded data frame

Throws:

DataFrameException - thrown if the data frame can not be loaded

load

public static DataFrame load(File file,
                             File metaFile,
                             FilterPredicate filterPredicate)
                      throws DataFrameException

Loads a data frame from a file and the corresponding meta file. Only rows validated by the filter are appended to the resulting data frame

Parameters:

file - data frame file

metaFile - data frame meta file

filterPredicate - row filter

Returns:

loaded data frame

Throws:

DataFrameException - thrown if the data frame can not be loaded

load

public static DataFrame load(File file,
                             File metaFile)
                      throws DataFrameException

Loads a data frame from a file and the corresponding meta file.

Parameters:

file - data frame file

metaFile - data frame meta file

Returns:

loaded data frame

Throws:

DataFrameException - thrown if the data frame can not be loaded

loadResource

public static DataFrame loadResource(String path,
                                     String metaPath,
                                     ClassLoader classLoader,
                                     FilterPredicate filterPredicate)
                              throws DataFrameException

Loads a data frame from a resource and the corresponding meta resource. Only rows validated by the filter are appended to the resulting data frame

Parameters:

path - path to data frame resource

metaPath - path to meta file resoure

classLoader - class loader for the resource

filterPredicate - row filter

Returns:

loaded data frame

Throws:

DataFrameException - thrown if the data frame can not be loaded

loadResource

public static DataFrame loadResource(String path,
                                     String metaPath,
                                     ClassLoader classLoader)
                              throws DataFrameException

Loads a data frame from a resource and the corresponding meta resource.

Parameters:

path - path to data frame resource

metaPath - path to meta file resoure

classLoader - class loader for the resource

Returns:

loaded data frame

Throws:

DataFrameException - thrown if the data frame can not be loaded

createColumns

public static Map<String,DataFrameColumn> createColumns(DataFrameMeta dataFrameMeta)
                                                 throws DataFrameException

Creates the columns from a data frame meta information

Parameters:

dataFrameMeta - meta information

Returns:

data frame columns

Throws:

DataFrameException - thrown if the columns can not be created