de.unknownreality.dataframe.meta

Class DataFrameMeta

java.lang.Object

de.unknownreality.dataframe.meta.DataFrameMeta

public class DataFrameMeta
extends Object

Created by Alex on 07.06.2016.

Field Summary

Fields

Modifier and Type	Field and Description
static String	META_FILE_EXTENSION

Constructor Summary

Constructors

Constructor and Description
DataFrameMeta()
DataFrameMeta(int size, Map<String,Class<? extends DataFrameColumn>> columns, Class<? extends ReadFormat> readFormatClass, Map<String,String> attributes)
DataFrameMeta(Map<String,Class<? extends DataFrameColumn>> columns, Class<? extends ReadFormat> readFormatClass, Map<String,String> attributes)

Method Summary

Modifier and Type	Method and Description
static DataFrameMeta	create(Class<? extends ReadFormat> readFormatClass, List<DataFrameColumn> columns, Map<String,String> writerAttributes) Creates data frame meta information
static DataFrameMeta	create(DataFrame dataFrame, Class<? extends ReadFormat> readFormatClass, DataWriter dataWriterBuilder) Creates data frame meta information
static DataFrameMeta	create(int size, Class<? extends ReadFormat> readFormatClass, List<DataFrameColumn> columns, Map<String,String> writerAttributes) Creates data frame meta information
Map<String,String>	getAttributes() Returns the attributes from the data writer used to write the data frame
List<ColumnInformation>	getColumnInformation()
Map<String,Class<? extends DataFrameColumn>>	getColumns() Returns a map of the columns in the data frame.
Class<? extends ReadFormat>	getReadFormatClass() Returns the ReaderBuilder class that can be used to read the data frame
int	getSize() Returns the size of the data frame

Methods inherited from class java.lang.Object

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

Field Detail

META_FILE_EXTENSION

public static final String META_FILE_EXTENSION

See Also:

Constant Field Values

Constructor Detail

DataFrameMeta

public DataFrameMeta()

DataFrameMeta

public DataFrameMeta(Map<String,Class<? extends DataFrameColumn>> columns,
                     Class<? extends ReadFormat> readFormatClass,
                     Map<String,String> attributes)

DataFrameMeta

public DataFrameMeta(int size,
                     Map<String,Class<? extends DataFrameColumn>> columns,
                     Class<? extends ReadFormat> readFormatClass,
                     Map<String,String> attributes)

Method Detail

create

public static DataFrameMeta create(DataFrame dataFrame,
                                   Class<? extends ReadFormat> readFormatClass,
                                   DataWriter dataWriterBuilder)

Creates data frame meta information

Parameters:

dataFrame - source data frame

readFormatClass - class of used read format

dataWriterBuilder - data writer used

Returns:

data frame meta information

create

public static DataFrameMeta create(Class<? extends ReadFormat> readFormatClass,
                                   List<DataFrameColumn> columns,
                                   Map<String,String> writerAttributes)

Creates data frame meta information

Parameters:

readFormatClass - class of used read format

columns - columns contained in meta file

writerAttributes - attributes of the used data writer

Returns:

data frame meta information

create

public static DataFrameMeta create(int size,
                                   Class<? extends ReadFormat> readFormatClass,
                                   List<DataFrameColumn> columns,
                                   Map<String,String> writerAttributes)

Creates data frame meta information

Parameters:

size - size of the data frame

readFormatClass - class of used read format

columns - columns contained in meta file

writerAttributes - attributes of the used data writer

Returns:

data frame meta information

getReadFormatClass

public Class<? extends ReadFormat> getReadFormatClass()

Returns the ReaderBuilder class that can be used to read the data frame

Returns:

reader builder class

getColumns

public Map<String,Class<? extends DataFrameColumn>> getColumns()

Returns a map of the columns in the data frame. The keys are the names of the columns. Values are the types of the columns

Returns:

column name/type map

getAttributes

public Map<String,String> getAttributes()

Returns the attributes from the data writer used to write the data frame

Returns:

attribute map for reader builder

getSize

public int getSize()

Returns the size of the data frame

Returns:

size

getColumnInformation

public List<ColumnInformation> getColumnInformation()