org.jsimpledb.change

Class SimpleFieldChange<T,V>

java.lang.Object

org.jsimpledb.change.Change<T>

org.jsimpledb.change.FieldChange<T>

org.jsimpledb.change.SimpleFieldChange<T,V>

Type Parameters:

T - the type of the object containing the changed field

V - the type of the changed field

public class SimpleFieldChange<T,V>
extends FieldChange<T>

Notification object that gets passed to @OnChange-annotated methods when a simple field changes.

Constructor Summary

Constructors

Constructor and Description
SimpleFieldChange(T jobj, int storageId, String fieldName, V oldValue, V newValue) Constructor.

Method Summary

Modifier and Type	Method and Description
void	apply(JTransaction jtx, JObject jobj) Apply this change to the given object in the given transaction.
boolean	equals(Object obj)
V	getNewValue() Get the value of the field after the change.
V	getOldValue() Get the value of the field before the change.
int	hashCode()
String	toString()
<R> R	visit(ChangeSwitch<R> target) Apply visitor pattern.

Methods inherited from class org.jsimpledb.change.FieldChange

getFieldName, getStorageId

Methods inherited from class org.jsimpledb.change.Change

apply, apply, apply, getJObject, getObject

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleFieldChange

public SimpleFieldChange(T jobj,
                         int storageId,
                         String fieldName,
                         V oldValue,
                         V newValue)

Constructor.

Parameters:

jobj - Java object containing the field that changed

storageId - the storage ID of the affected field

fieldName - the name of the field that changed

oldValue - the old field value

newValue - the new field value

Throws:

IllegalArgumentException - if jobj or fieldName is null

Method Detail

visit

public <R> R visit(ChangeSwitch<R> target)

Description copied from class: Change

Apply visitor pattern. Invokes the method of target corresponding to this instance's type.

Specified by:

visit in class Change<T>

Type Parameters:

R - visitor return type

Parameters:

target - visitor pattern target

Returns:

value returned by the selected method of target

apply

public void apply(JTransaction jtx,
                  JObject jobj)

Description copied from class: Change

Apply this change to the given object in the given transaction.

Specified by:

apply in class Change<T>

Parameters:

jtx - the transaction in which to apply this change

jobj - the target object to which to apply this change

getOldValue

public V getOldValue()

Get the value of the field before the change.

Returns:

the old field value

getNewValue

public V getNewValue()

Get the value of the field after the change.

Returns:

the new field value

equals

public boolean equals(Object obj)

Overrides:

equals in class FieldChange<T>

hashCode

public int hashCode()

Overrides:

hashCode in class FieldChange<T>

toString

public String toString()

Overrides:

toString in class Object