Package org.apache.druid.frame.field

Class RowMemoryFieldPointer

java.lang.Object

org.apache.druid.frame.field.RowMemoryFieldPointer

All Implemented Interfaces:

ReadableFieldPointer

public class RowMemoryFieldPointer
extends Object
implements ReadableFieldPointer

A ReadableFieldPointer that is derived from a row-based frame. Returns the position and the length of a field at a particular position for the row that the rowPointer is pointing to at the time. It caches the values of the position and the length based on position of the rowPointer. This method is not thread-safe

Constructor Summary

Constructors

Constructor	Description
RowMemoryFieldPointer(org.apache.datasketches.memory.Memory memory, ReadableFrameRowPointer rowPointer, int fieldNumber, int fieldCount)

Method Summary

Modifier and Type	Method	Description
long	length()	Length of the field.
long	position()	Starting position of the field.

Methods inherited from class java.lang.Object

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

Constructor Details

RowMemoryFieldPointer

public RowMemoryFieldPointer(org.apache.datasketches.memory.Memory memory,
 ReadableFrameRowPointer rowPointer,
 int fieldNumber,
 int fieldCount)

Method Details

position

public long position()

Description copied from interface: ReadableFieldPointer

Starting position of the field.

Specified by:

position in interface ReadableFieldPointer

length

public long length()

Description copied from interface: ReadableFieldPointer

Length of the field. Never necessary to read a field, since all fields can be read without knowing their entire length. Provided because it may be useful for reading in a more optimal manner.

Specified by:

length in interface ReadableFieldPointer