java.lang.Object
- tech.tablesaw.columns.AbstractColumn<C,T>

All Implemented Interfaces:

Iterable<T>, Comparator<T>, Column<T>

Direct Known Subclasses:

BooleanColumn, DateColumn, DateTimeColumn, InstantColumn, NumberColumn, StringColumn, TimeColumn
```
public abstract class AbstractColumn<C extends Column<T>,T>
extends Object
implements Column<T>
```
Partial implementation of the Column interface

Field Summary

Fields
Modifier and Type Field Description

static int DEFAULT_ARRAY_SIZE

Constructor Summary

Constructors
Constructor	Description
`AbstractColumn(ColumnType type, String name, AbstractColumnParser<T> parser)`	Constructs a column with the given `ColumnType`, name, and `AbstractColumnParser`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`StringColumn`	`asStringColumn()`	Returns a StringColumn consisting of the (unformatted) String representation of this column values
`abstract Column<T>`	`emptyCopy()`	Returns a copy of the receiver with no data.
`C`	`filter(Predicate<? super T> test)`	Returns a new Column of the same type with only those rows satisfying the predicate
`C`	`first(int numRows)`	Returns a column of the same type containing the first `numRows` of this column.
`int`	`indexOf(Object o)`	Returns the index of the first occurrence of `o` in the column or -1 if the element is not in the column.
`C`	`inRange(int start, int end)`	Returns a column containing the rows in this column beginning with start inclusive, and ending with end exclusive
`C`	`last(int numRows)`	Returns a column of the same type containing the last `numRows` of this column.
`int`	`lastIndexOf(Object o)`	Returns the index of the last occurrence of `o` in the column or -1 if the element is not in the column.
`C`	`map(Function<? super T,? extends T> fun)`	Maps the function across all rows, appending the results to a new Column of the same type
`C`	`max(Column<T> other)`	Returns a column containing the element-wise min between this column and other column
`C`	`min(Column<T> other)`	Returns a column containing the element-wise min between this column and other column
`String`	`name()`	Returns the column's name.
`AbstractColumnParser<T>`	`parser()`	Returns the parser used by `Column.appendCell(String)` ()}.
`C`	`sampleN(int n)`	Returns a column containing a random sample of the values in this column
`C`	`sampleX(double proportion)`	Returns a table consisting of randomly selected values from this column.
`C`	`set(Selection rowSelection, T newValue)`	Conditionally update this column, replacing current values with newValue for all rows where the current value matches the selection criteria
`C`	`set(Selection condition, Column<T> other)`	Updates this column where values matching the selection are replaced with the corresponding value from the given column
`C`	`setName(String name)`	Sets the columns name to the given string
`C`	`setParser(AbstractColumnParser<T> parser)`	Sets the parser used by `Column.appendCell(String)`
`C`	`sorted(Comparator<? super T> comp)`	Returns a new Column of the same type sorted according to the provided Comparator
`C`	`subset(int[] rows)`	Return a column of the same type containing just those elements whose indexes are included in the given array
`String`	`toString()`
`ColumnType`	`type()`	Returns this column's ColumnType

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface tech.tablesaw.columns.Column
allMatch, anyMatch, append, append, append, appendCell, appendCell, appendMissing, appendObj, asBytes, asList, asObjectArray, asSet, byteSize, clear, columnWidth, contains, copy, count, count, countMissing, countUnique, emptyCopy, equals, get, getString, getUnformattedString, interpolate, isEmpty, isMissing, isMissing, isNotMissing, lag, lead, map, mapInto, max, min, noneMatch, print, reduce, reduce, removeMissing, rolling, rowComparator, set, set, set, set, setMissing, setMissingTo, size, sortAscending, sortDescending, summary, title, unique, valueHash, where

Methods inherited from interface java.util.Comparator
compare, equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Methods inherited from interface java.lang.Iterable
forEach, iterator, spliterator

- Field Detail
  - DEFAULT_ARRAY_SIZE
```
public static final int DEFAULT_ARRAY_SIZE
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - AbstractColumn
```
public AbstractColumn(ColumnType type,
                      String name,
                      AbstractColumnParser<T> parser)
```
    Constructs a column with the given ColumnType, name, and AbstractColumnParser
- Method Detail
  - name
```
public String name()
```
    Returns the column's name.
    
    Specified by:
    
    name in interface Column<C extends Column<T>>
    
    Returns:
    
    name as String
  - setName
```
public C setName(String name)
```
    Sets the columns name to the given string
    
    Specified by:
    
    setName in interface Column<C extends Column<T>>
    
    Parameters:
    
    name - The new name MUST be unique for any table containing this column
    
    Returns:
    
    this Column to allow method chaining
  - parser
```
public AbstractColumnParser<T> parser()
```
    Returns the parser used by Column.appendCell(String) ()}.
    
    Specified by:
    
    parser in interface Column<C extends Column<T>>
    
    Returns:
    
    AbstractColumnParser
  - setParser
```
public C setParser(AbstractColumnParser<T> parser)
```
    Sets the parser used by Column.appendCell(String)
    
    Specified by:
    
    setParser in interface Column<C extends Column<T>>
    
    Parameters:
    
    parser - a column parser that converts text input to the column data type
    
    Returns:
    
    this Column to allow method chaining
  - type
```
public ColumnType type()
```
    Returns this column's ColumnType
    
    Specified by:
    
    type in interface Column<C extends Column<T>>
    
    Returns:
    
    ColumnType
  - emptyCopy
```
public abstract Column<T> emptyCopy()
```
    Returns a copy of the receiver with no data. The column name and type are the same.
    
    Specified by:
    
    emptyCopy in interface Column<C extends Column<T>>
    
    Returns:
    
    a empty copy of Column
  - filter
```
public C filter(Predicate<? super T> test)
```
    Returns a new Column of the same type with only those rows satisfying the predicate
    
    Specified by:
    
    filter in interface Column<C extends Column<T>>
    
    Parameters:
    
    test - the predicate
    
    Returns:
    
    a new Column of the same type with only those rows satisfying the predicate
  - sorted
```
public C sorted(Comparator<? super T> comp)
```
    Returns a new Column of the same type sorted according to the provided Comparator
    
    Specified by:
    
    sorted in interface Column<C extends Column<T>>
    
    Parameters:
    
    comp - the Comparator
    
    Returns:
    
    a sorted Column
  - map
```
public C map(Function<? super T,? extends T> fun)
```
    Maps the function across all rows, appending the results to a new Column of the same type
    
    Specified by:
    
    map in interface Column<C extends Column<T>>
    
    Parameters:
    
    fun - function to map
    
    Returns:
    
    the Column with the results
  - min
```
public C min(Column<T> other)
```
    Returns a column containing the element-wise min between this column and other column
    TODO(lwhite) Override in column subtypes for better performance
    
    Specified by:
    
    min in interface Column<C extends Column<T>>
  - max
```
public C max(Column<T> other)
```
    Returns a column containing the element-wise min between this column and other column
    TODO(lwhite) Override in column subtypes for better performance
    
    Specified by:
    
    max in interface Column<C extends Column<T>>
  - set
```
public C set(Selection condition,
             Column<T> other)
```
    Updates this column where values matching the selection are replaced with the corresponding value from the given column
    
    Specified by:
    
    set in interface Column<C extends Column<T>>
  - set
```
public C set(Selection rowSelection,
             T newValue)
```
    Conditionally update this column, replacing current values with newValue for all rows where the current value matches the selection criteria
    
    Specified by:
    
    set in interface Column<C extends Column<T>>
  - first
```
public C first(int numRows)
```
    Returns a column of the same type containing the first numRows of this column.
    
    Specified by:
    
    first in interface Column<C extends Column<T>>
  - last
```
public C last(int numRows)
```
    Returns a column of the same type containing the last numRows of this column.
    
    Specified by:
    
    last in interface Column<C extends Column<T>>
  - sampleN
```
public C sampleN(int n)
```
    Returns a column containing a random sample of the values in this column
    
    Specified by:
    
    sampleN in interface Column<C extends Column<T>>
    
    Parameters:
    
    n - the number of values to select
    
    Returns:
    
    A column of the same type as the receiver
  - sampleX
```
public C sampleX(double proportion)
```
    Returns a table consisting of randomly selected values from this column. The sample size is based on the given proportion of the total number of cells in this column
    
    Specified by:
    
    sampleX in interface Column<C extends Column<T>>
    
    Parameters:
    
    proportion - The proportion to go in the sample
  - subset
```
public C subset(int[] rows)
```
    Return a column of the same type containing just those elements whose indexes are included in the given array
    
    Specified by:
    
    subset in interface Column<C extends Column<T>>
  - inRange
```
public C inRange(int start,
                 int end)
```
    Returns a column containing the rows in this column beginning with start inclusive, and ending with end exclusive
    
    Specified by:
    
    inRange in interface Column<C extends Column<T>>
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - asStringColumn
```
public StringColumn asStringColumn()
```
    Returns a StringColumn consisting of the (unformatted) String representation of this column values
    
    Specified by:
    
    asStringColumn in interface Column<C extends Column<T>>
    
    Returns:
    
    a StringColumn built using the column Column.getUnformattedString(int) method
  - indexOf
```
public int indexOf(Object o)
```
    Returns the index of the first occurrence of o in the column or -1 if the element is not in the column.
    
    Specified by:
    
    indexOf in interface Column<C extends Column<T>>
  - lastIndexOf
```
public int lastIndexOf(Object o)
```
    Returns the index of the last occurrence of o in the column or -1 if the element is not in the column.
    
    Specified by:
    
    lastIndexOf in interface Column<C extends Column<T>>

Class AbstractColumn<C extends Column<T>,​T>

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface tech.tablesaw.columns.Column

Methods inherited from interface java.util.Comparator

Methods inherited from interface java.lang.Iterable

Field Detail

DEFAULT_ARRAY_SIZE

Constructor Detail

AbstractColumn

Method Detail

name

setName

parser

setParser

type

emptyCopy

filter

sorted

map

min

max

set

set

first

last

sampleN

sampleX

subset

inRange

toString

asStringColumn

indexOf

lastIndexOf

Class AbstractColumn<C extends Column<T>,T>