Package com.qfs.column

Interface IColumn<K>

Type Parameters:

K - the type of elements stored in this column

All Superinterfaces:

IArray, IArrayReader, IArrayWriter, IMemoryMonitored, IWritableArray

All Known Subinterfaces:

IColumnInteger

All Known Implementing Classes:

AChunkedColumn, AColumnStore.ColumnView, AColumnStore.CompositeColumnView, AReplicatedColumn, ChunkedColumn, ColumnBoolean, ColumnInteger, ColumnLong, ColumnPositiveInteger, LazyChunkedColumn, LazyChunkedColumnWithAggregation, LazyChunkedCompositeColumn, ReplicatedColumn, ReplicatedColumnDecorateArray, TombstoneColumn

public interface IColumn<K>
extends IWritableArray

A column is a writable array of elements that all have the same type.

It can be expanded to any capacity.

Author:

ActiveViam

Method Summary

Modifier and Type	Method	Description
int	ensureCapacity(int capacity)	Ensures that this column is large enough to store at least the requested number of elements.
int	getCapacity()	Returns the current capacity of this column.
int	growCapacity(int capacity)	Ensures that this column is large enough to store at least the requested number of elements.
K	read(int position)	Reads a value at some index in an array.

Methods inherited from interface com.qfs.chunk.IArrayReader

isNull, readBoolean, readDouble, readFloat, readInt, readLong, readVector

Methods inherited from interface com.qfs.chunk.IArrayWriter

addDouble, addFloat, addInt, addLong, write, writeBoolean, writeDouble, writeFloat, writeInt, writeLong

Methods inherited from interface com.qfs.monitoring.memory.IMemoryMonitored

getMemoryStatistic

Methods inherited from interface com.qfs.chunk.IWritableArray

createArrayCursor

Method Details

read

K read(int position)

Description copied from interface: IArrayReader

Reads a value at some index in an array.

Specified by:

read in interface IArrayReader

Parameters:

position - 0-based index in an array

Returns:

the data stored at that position in the array

getCapacity

int getCapacity()

Returns the current capacity of this column.

The capacity is the number of elements that can be stored in this column.

Returns:

the current capacity of this column

ensureCapacity

int ensureCapacity(int capacity)

Ensures that this column is large enough to store at least the requested number of elements.

This method will conservatively expand this column and allocate the minimum amount of space necessary to store the required number of elements.

Parameters:

capacity - the target number of elements that should be stored in this column

Returns:

the actual capacity of this column after this method has been executed

growCapacity

int growCapacity(int capacity)

Ensures that this column is large enough to store at least the requested number of elements.

This method will aggressively expand this column and at least double the current capacity if it is not large enough.

Parameters:

capacity - the target number of elements that should be stored in this column

Returns:

the actual capacity of this column after this method has been executed