Package com.lumiomedical.etl.dataframe.descriptor

Class ColumnDescriptor<T,C extends tech.tablesaw.columns.Column<T>>

java.lang.Object

com.lumiomedical.etl.dataframe.descriptor.ColumnDescriptor<T,C>

public final class ColumnDescriptor<T,C extends tech.tablesaw.columns.Column<T>>
extends Object

This class is expected to simplify the signature of other classes interacting with tablesaw Columns and Rows by providing a centralized "repository" of references to Column-related methods. These methods have type-sensitive names and can be "hard" to abstract away ; eg. in order to abstract both the creation of a column and its subsequent modification within a row, you need to know which factory method and which setter to call. By having these singleton descriptors, one can create simpler class signatures that simply request a coherent set of references. Before these, we had to manually require Function and BiFunction of all sorts in TableProcessor implementations, which was rather confusing and got out of hand very quickly. At the time of this writing, the class has a private constructor, but this could be modified if it turns out we want to allow for custom column types or custom descriptors.

Author:

Pierre Lecerf ([email protected]) Created on 2020/08/14

Field Summary

Fields

Modifier and Type	Field	Description
static ColumnDescriptor<Boolean,tech.tablesaw.api.BooleanColumn>	BOOLEAN
static ColumnDescriptor<Double,tech.tablesaw.api.DoubleColumn>	DOUBLE
static ColumnDescriptor<Float,tech.tablesaw.api.FloatColumn>	FLOAT
static ColumnDescriptor<Instant,tech.tablesaw.api.InstantColumn>	INSTANT
static ColumnDescriptor<Integer,tech.tablesaw.api.IntColumn>	INTEGER
static ColumnDescriptor<Long,tech.tablesaw.api.LongColumn>	LONG
static ColumnDescriptor<Short,tech.tablesaw.api.ShortColumn>	SHORT
static ColumnDescriptor<String,tech.tablesaw.api.StringColumn>	STRING
static ColumnDescriptor<String,tech.tablesaw.api.TextColumn>	TEXT

Method Summary

Modifier and Type	Method	Description
tech.tablesaw.columns.Column<T>	createColumn(String columnName, int rowCount)
static ColumnDescriptor	forType(tech.tablesaw.api.ColumnType type)
tech.tablesaw.columns.Column<T>	getColumn(tech.tablesaw.api.Table table, String name)
Class<C>	getColumnType()
tech.tablesaw.api.ColumnType	getType()
T	getValue(tech.tablesaw.api.Row row, String columnName)
void	setValue(tech.tablesaw.api.Row row, String columnName, T value)

Methods inherited from class java.lang.Object

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

Field Details

STRING

public static final ColumnDescriptor<String,tech.tablesaw.api.StringColumn> STRING

TEXT

public static final ColumnDescriptor<String,tech.tablesaw.api.TextColumn> TEXT

SHORT

public static final ColumnDescriptor<Short,tech.tablesaw.api.ShortColumn> SHORT

INTEGER

public static final ColumnDescriptor<Integer,tech.tablesaw.api.IntColumn> INTEGER

LONG

public static final ColumnDescriptor<Long,tech.tablesaw.api.LongColumn> LONG

FLOAT

public static final ColumnDescriptor<Float,tech.tablesaw.api.FloatColumn> FLOAT

DOUBLE

public static final ColumnDescriptor<Double,tech.tablesaw.api.DoubleColumn> DOUBLE

BOOLEAN

public static final ColumnDescriptor<Boolean,tech.tablesaw.api.BooleanColumn> BOOLEAN

INSTANT

public static final ColumnDescriptor<Instant,tech.tablesaw.api.InstantColumn> INSTANT

Method Details

forType

public static ColumnDescriptor forType(tech.tablesaw.api.ColumnType type)

Parameters:

type -

Returns:

getType

public tech.tablesaw.api.ColumnType getType()

Returns:

getColumnType

public Class<C> getColumnType()

Returns:

getColumn

public tech.tablesaw.columns.Column<T> getColumn(tech.tablesaw.api.Table table, String name)

Parameters:

table -

name -

Returns:

createColumn

public tech.tablesaw.columns.Column<T> createColumn(String columnName, int rowCount)

Parameters:

columnName -

rowCount -

Returns:

getValue

public T getValue(tech.tablesaw.api.Row row, String columnName)

Parameters:

row -

columnName -

Returns:

setValue

public void setValue(tech.tablesaw.api.Row row, String columnName, T value)

Parameters:

row -

columnName -

value -