Interface Datom

public interface Datom

An immmutable, point-in-time fact: [entity, attribute, value, transaction, added]

Method Summary

Modifier and Type	Method	Description
Object	a()	This datom's attribute id.
boolean	added()	Is this datom added or retracted?
Object	e()	This datom's entity id.
Object	get(int index)	Positional getter, as if datom is tuple of [e a v tx added]
Object	tx()	This datom's transaction id.
Object	v()	This datom's value.

Method Details

e

Object e()

This datom's entity id.

Returns:

entity id

a

Object a()

This datom's attribute id.

Returns:

attribute id

v

Object v()

This datom's value.

Returns:

value

tx

Object tx()

This datom's transaction id.

Returns:

transaction id

added

boolean added()

Is this datom added or retracted?

When datoms come from Database.history(), this method can be used to distinguish additions from retractions

Returns:

a boolean indicating whether this datom was added or retracted

get

Object get(int index)

Positional getter, as if datom is tuple of [e a v tx added]

Parameters:

index - numeric index in the range [0,4]

Returns:

the value at this position in the datom