tech.bitey.dataframe

Interface DateColumn

All Superinterfaces:

Collection<LocalDate>, Column<LocalDate>, Iterable<LocalDate>, List<LocalDate>

public interface DateColumn
extends Column<LocalDate>

A Column with element type LocalDate.

Each date is stored encoded as an int in a ByteBuffer.

Author:

biteytech@protonmail.com

Field Summary

Fields inherited from interface tech.bitey.dataframe.Column

BASE_CHARACTERISTICS

Method Summary

Modifier and Type	Method and Description
DateColumn	append(Column<LocalDate> tail) Appends two columns with the same element type.
static DateColumnBuilder	builder() Returns a new DateColumnBuilder
static DateColumnBuilder	builder(int characteristic) Returns a builder with the specified characteristic.
static Collector<LocalDate,?,DateColumn>	collector() Collects a stream of LocalDates into a new DateColumn.
static Collector<LocalDate,?,DateColumn>	collector(int characteristic) Collects a stream of LocalDates into a new DateColumn with the specified characteristic.
DateColumn	copy() Returns a column equal to this one, but with elements stored in a newly allocated buffer.
DateColumn	head(LocalDate toElement) Same behavior as Column.head(Object, boolean), with inclusive set to false.
DateColumn	head(LocalDate toElement, boolean inclusive) Returns a view of the portion of this column whose elements are less than (or equal to, if inclusive is true) toElement.
static DateColumn	of(LocalDate... elements) Returns a new DateColumn containing the specified elements.
DateColumn	subColumn(int fromIndex, int toIndex) Returns a view of the portion of this column between the specified fromIndex, inclusive, and toIndex, exclusive.
DateColumn	subColumnByValue(LocalDate fromElement, boolean fromInclusive, LocalDate toElement, boolean toInclusive) Returns a view of the portion of this column whose elements range from fromElement to toElement.
DateColumn	subColumnByValue(LocalDate fromElement, LocalDate toElement) Same behavior as Column#subColumn(Object, boolean, Object, Boolean), with fromInclusive set to true and toInclusive set to false.
DateColumn	tail(LocalDate fromElement) Same behavior as Column.tail(Object, boolean), with inclusive set to true.
DateColumn	tail(LocalDate fromElement, boolean inclusive) Returns a view of the portion of this column whose elements are greater than (or equal to, if inclusive is true) fromElement.
DateColumn	toDistinct() Converts a column to a unique index.
DateColumn	toHeap() Converts an index into a heap.
DateColumn	toSorted() Converts a heap to an index.
int	yyyymmdd(int index)

Methods inherited from interface tech.bitey.dataframe.Column

append, ceiling, characteristics, comparator, first, floor, getType, higher, isDistinct, isNonnull, isNull, isSorted, last, lower, spliterator

Methods inherited from interface java.util.List

add, add, addAll, addAll, clear, contains, containsAll, equals, get, hashCode, indexOf, isEmpty, iterator, lastIndexOf, listIterator, listIterator, remove, remove, removeAll, replaceAll, retainAll, set, size, sort, subList, toArray, toArray

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Method Detail

subColumn

DateColumn subColumn(int fromIndex,
                     int toIndex)

Description copied from interface: Column

Returns a view of the portion of this column between the specified fromIndex, inclusive, and toIndex, exclusive. (If fromIndex and toIndex are equal, the returned list is empty.) The returned column is backed by this column.

Specified by:

subColumn in interface Column<LocalDate>

Parameters:

fromIndex - low endpoint (inclusive) of the subList

toIndex - high endpoint (exclusive) of the subList

Returns:

a view of the specified range within this column

subColumnByValue

DateColumn subColumnByValue(LocalDate fromElement,
                            boolean fromInclusive,
                            LocalDate toElement,
                            boolean toInclusive)

Description copied from interface: Column

Returns a view of the portion of this column whose elements range from fromElement to toElement. If fromElement and toElement are equal, the returned column is empty unless fromInclusive and toInclusive are both true. The returned column is backed by this column.

This method is only available when Column.isDistinct() returns true.

Specified by:

subColumnByValue in interface Column<LocalDate>

Parameters:

fromElement - low endpoint of the returned column

fromInclusive - true if the low endpoint is to be included in the result

toElement - high endpoint of the returned column

toInclusive - true if the high endpoint is to be included in the result

Returns:

a view of the portion of this column whose elements range from fromElement to toElement

subColumnByValue

DateColumn subColumnByValue(LocalDate fromElement,
                            LocalDate toElement)

Description copied from interface: Column

Same behavior as Column#subColumn(Object, boolean, Object, Boolean), with fromInclusive set to true and toInclusive set to false.

This method is only available when Column.isDistinct() returns true.

Specified by:

subColumnByValue in interface Column<LocalDate>

Parameters:

fromElement - low endpoint of the returned column, inclusive

toElement - high endpoint of the returned column, exclusive

Returns:

view of the portion of this column whose elements range from fromElement, inclusive, to toElement, exclusive

head

DateColumn head(LocalDate toElement,
                boolean inclusive)

Description copied from interface: Column

Returns a view of the portion of this column whose elements are less than (or equal to, if inclusive is true) toElement. The returned column is backed by this column.

This method is only available when Column.isDistinct() returns true.

Specified by:

head in interface Column<LocalDate>

Parameters:

toElement - high endpoint of the returned column

inclusive - true if the high endpoint is to be included in the returned view

Returns:

a view of the portion of this column whose elements are less than (or equal to, if inclusive is true) toElement

head

DateColumn head(LocalDate toElement)

Description copied from interface: Column

Same behavior as Column.head(Object, boolean), with inclusive set to false.

This method is only available when Column.isDistinct() returns true.

Specified by:

head in interface Column<LocalDate>

Parameters:

toElement - high endpoint of the returned column

Returns:

a view of the portion of this column whose elements are less than toElement

tail

DateColumn tail(LocalDate fromElement,
                boolean inclusive)

Description copied from interface: Column

Returns a view of the portion of this column whose elements are greater than (or equal to, if inclusive is true) fromElement. The returned column is backed by this column.

This method is only available when Column.isDistinct() returns true.

Specified by:

tail in interface Column<LocalDate>

Parameters:

fromElement - low endpoint of the returned column

inclusive - true if the low endpoint is to be included in the returned view

Returns:

a view of the portion of this column whose elements are greater than or equal to fromElement

tail

DateColumn tail(LocalDate fromElement)

Description copied from interface: Column

Same behavior as Column.tail(Object, boolean), with inclusive set to true.

This method is only available when Column.isDistinct() returns true.

Specified by:

tail in interface Column<LocalDate>

Parameters:

fromElement - low endpoint of the returned column

Returns:

a view of the portion of this column whose elements are greater than or equal to fromElement

toHeap

DateColumn toHeap()

Description copied from interface: Column

Converts an index into a heap.

Specified by:

toHeap in interface Column<LocalDate>

Returns:

a column equal to this one, but which reports Column.isSorted() as false. The resulting column shares the same underlying buffer as this one.

toSorted

DateColumn toSorted()

Description copied from interface: Column

Converts a heap to an index. The resulting column will have the same elements, but sorted in ascending order. The behavior of this method depends on the Column.characteristics() of this column:

• heap - checks if the column is already sorted. If so, returns a new column which shares the same underlying buffer, but with SORTED flag set. If not already sorted then Column.copy() will be invoked, and the resulting column will be sorted.
• sorted - returns this column
• distinct - returns a new column which shares the same underlying buffer, but with DISTINCT flag unset.

Specified by:

toSorted in interface Column<LocalDate>

Returns:

a column with elements sorted in ascending order

toDistinct

DateColumn toDistinct()

Description copied from interface: Column

Converts a column to a unique index. The behavior of this method depends on the Column.characteristics() of this column:

• heap - checks if the column is already sorted and distinct. If so, returns a new column which shares the same underlying buffer, but with SORTED and DISTINCT flags set. If not already sorted and distinct then Column.copy() will be invoked, and the resulting column will be sorted and deduplicated.
• sorted - checks if the column contains duplicates. If not, returns a new column which shares the same underlying buffer, but with DISTINCT flag set. If duplicates are present then Column.copy() will be invoked, and the resulting column will be deduplicated.
• distinct - returns this column

Specified by:

toDistinct in interface Column<LocalDate>

Returns:

a column with distinct elements sorted in ascending order

append

DateColumn append(Column<LocalDate> tail)

Description copied from interface: Column

Appends two columns with the same element type.

Both columns must have the same characteristics. If they're both unique indices then the first value of the provided column must be greater than the last value of this column.

Specified by:

append in interface Column<LocalDate>

Parameters:

tail - - the column to be appended to the end of this column

Returns:

the provided column appended to the end of this column

copy

DateColumn copy()

Description copied from interface: Column

Returns a column equal to this one, but with elements stored in a newly allocated buffer.

Specified by:

copy in interface Column<LocalDate>

Returns:

a column equal to this one, but with elements stored in a newly allocated buffer.

yyyymmdd

int yyyymmdd(int index)

builder

static DateColumnBuilder builder(int characteristic)

Returns a builder with the specified characteristic.

Parameters:

characteristic - - one of:

• 0 (zero) - no constraints on the elements to be added to the column
• NONNULL
• SORTED
• DISTINCT

Returns:

a new DateColumnBuilder

Throws:

IllegalArgumentException - if characteristic is not valid

builder

static DateColumnBuilder builder()

Returns a new DateColumnBuilder

Equivalent to builder(0)

Returns:

a new DateColumnBuilder

of

static DateColumn of(LocalDate... elements)

Returns a new DateColumn containing the specified elements.

Parameters:

elements - the elements to be included in the new column

Returns:

a new DateColumn containing the specified elements.

collector

static Collector<LocalDate,?,DateColumn> collector(int characteristic)

Collects a stream of LocalDates into a new DateColumn with the specified characteristic.

Parameters:

characteristic - - one of:

• 0 (zero) - no constraints on the elements to be added to the column
• NONNULL
• SORTED
• DISTINCT

Returns:

a new DateColumn

Throws:

IllegalArgumentException - if characteristic is not valid

collector

static Collector<LocalDate,?,DateColumn> collector()

Collects a stream of LocalDates into a new DateColumn.

Equivalent to collector(0)

Returns:

a new DateColumn