Package cz.cvut.kbss.jopa.sessions.change

Class ChangeCalculator

java.lang.Object

cz.cvut.kbss.jopa.sessions.change.ChangeCalculator

public class ChangeCalculator
extends Object

Calculates changes made on objects by comparing a clone with its registered original.

Constructor Summary

Constructors

Constructor	Description
ChangeCalculator(MetamodelProvider metamodelProvider)

Method Summary

Modifier and Type	Method	Description
boolean	calculateChanges(ObjectChangeSet changeSet)	Calculates the changes that happened to the clone object.
boolean	hasChanges(Object original, Object clone)	Checks whether there are any changes to the clone.

Methods inherited from class java.lang.Object

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

Constructor Details

ChangeCalculator

public ChangeCalculator(MetamodelProvider metamodelProvider)

Method Details

hasChanges

public boolean hasChanges(Object original,
 Object clone)

Checks whether there are any changes to the clone.

It does an object value comparison, i.e. it compares each value of the clone against the original value and returns true if a change is found.

Parameters:

original - The original object.

clone - The clone, whose changes we are looking for.

Returns:

True if there is a change (at least one) or false, if the values are identical.

calculateChanges

public boolean calculateChanges(ObjectChangeSet changeSet)

Calculates the changes that happened to the clone object.

The changes are written into the Change passed in as argument.

Parameters:

changeSet - Contains references to the original and clone objects. Into this change set the changes should be propagated

Returns:

true if there were any changes, false otherwise

Throws:

NullPointerException - If changeSet is null