org.apache.drill.exec.vector.accessor.writer

Class AbstractArrayWriter.ArrayElementWriterIndex

java.lang.Object

org.apache.drill.exec.vector.accessor.writer.AbstractArrayWriter.ArrayElementWriterIndex

All Implemented Interfaces:

ColumnWriterIndex

Direct Known Subclasses:

ScalarArrayWriter.ScalarElementWriterIndex

Enclosing class:

AbstractArrayWriter

public class AbstractArrayWriter.ArrayElementWriterIndex
extends Object
implements ColumnWriterIndex

Index into the vector of elements for a repeated vector. Keeps track of the current offset in terms of value positions. Forwards overflow events to the base index.

Constructor Summary

Constructors

Constructor and Description
ArrayElementWriterIndex()

Method Summary

Modifier and Type	Method and Description
int	arraySize()
protected void	next()
void	nextElement() Increment the index for an array.
ColumnWriterIndex	outerIndex() If this index represents a repeat level, return the index of the next higher repeat level.
protected void	prev()
void	prevElement() Decrement the index for an array.
void	reset()
void	rollover() When handling overflow, the index must be reset so that the current row starts at the start of the vector.
int	rowStartIndex() Index of the first entry for the current row
String	toString()
int	valueStartOffset()
int	vectorIndex() Current row or array index.

Methods inherited from class java.lang.Object

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

Constructor Detail

ArrayElementWriterIndex

public ArrayElementWriterIndex()

Method Detail

reset

public void reset()

vectorIndex

public int vectorIndex()

Description copied from interface: ColumnWriterIndex

Current row or array index.

Specified by:

vectorIndex in interface ColumnWriterIndex

Returns:

row or array index

rowStartIndex

public int rowStartIndex()

Description copied from interface: ColumnWriterIndex

Index of the first entry for the current row

Specified by:

rowStartIndex in interface ColumnWriterIndex

Returns:

index of the first entry for the current row

arraySize

public int arraySize()

nextElement

public void nextElement()

Description copied from interface: ColumnWriterIndex

Increment the index for an array. For arrays, writing (or saving) one value automatically moves to the next value. Ignored for non-element indexes.

Specified by:

nextElement in interface ColumnWriterIndex

prevElement

public void prevElement()

Description copied from interface: ColumnWriterIndex

Decrement the index for an array. Used exclusively for appending bytes to a VarChar, Var16Char or VarBytes column. Assumed to be followed by another call to nextElement().

Specified by:

prevElement in interface ColumnWriterIndex

next

protected void next()

prev

protected void prev()

valueStartOffset

public int valueStartOffset()

rollover

public void rollover()

Description copied from interface: ColumnWriterIndex

When handling overflow, the index must be reset so that the current row starts at the start of the vector. Relative offsets must be preserved. (That is, if the current write position for an array is four greater than the start, then that offset must now be reset to four from the start of the vector.)

Specified by:

rollover in interface ColumnWriterIndex

outerIndex

public ColumnWriterIndex outerIndex()

Description copied from interface: ColumnWriterIndex

If this index represents a repeat level, return the index of the next higher repeat level.

Specified by:

outerIndex in interface ColumnWriterIndex

Returns:

the outer repeat level index, if any

toString

public String toString()

Overrides:

toString in class Object