Package com.graphaware.common.util

Class Change<T>

java.lang.Object

com.graphaware.common.util.Change<T>

public class Change<T>
extends Object

Change in the state of an object, encapsulating the old (previous) and the new (current).

Constructor Summary

Constructors

Constructor	Description
Change(T previous, T current)	Construct a change representation.

Method Summary

Modifier and Type	Method	Description
static <T extends Entity> Map<Long,Change<T>>	changesToMap(Collection<Change<T>> changes)	Convert a collection of Changes of Entity to a map of Changes keyed by the Entity ID.
boolean	equals(Object o)
T	getCurrent()	Get the current (new) state of the object.
T	getPrevious()	Get the previous (old) state of the object.
int	hashCode()

Methods inherited from class java.lang.Object

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

Constructor Detail

Change

public Change(T previous,
              T current)

Construct a change representation.

Parameters:

previous - state of the object.

current - state of the object.

Method Detail

getPrevious

public T getPrevious()

Get the previous (old) state of the object.

Returns:

previous state

getCurrent

public T getCurrent()

Get the current (new) state of the object.

Returns:

current state

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

changesToMap

public static <T extends Entity> Map<Long,Change<T>> changesToMap(Collection<Change<T>> changes)

Convert a collection of Changes of Entity to a map of Changes keyed by the Entity ID.

Type Parameters:

T - type of the Entity.

Parameters:

changes - to convert.

Returns:

map keyed by Entity ID with the actual Changes as values.

Throws:

IllegalArgumentException - in case the two Entitys contained in a Change do not have the same IDs.