io.permazen.change

Class FieldChange<T>

java.lang.Object

io.permazen.change.Change<T>

io.permazen.change.FieldChange<T>

Type Parameters:

T - the type of the object containing the changed field

Direct Known Subclasses:

ListFieldChange, MapFieldChange, SetFieldChange, SimpleFieldChange

public abstract class FieldChange<T>
extends Change<T>

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

Note that it's possible, using the core API, to change a field without first updating the containing object's schema version. As older schema versions may have different fields than the schema version associated with a particular Permazen instance, it's therefore possible to receive change notifications about changes to fields not present in the current schema. This will not happen unless the lower level core API is used directly, FieldChange events are being generated manually, etc.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	FieldChange(T jobj, int storageId, String fieldName) Constructor.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
String	getFieldName() Get the name of the field that changed.
int	getStorageId() Get the storage ID of the field that changed.
int	hashCode()

Methods inherited from class io.permazen.change.Change

apply, apply, apply, apply, getJObject, getObject, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldChange

protected FieldChange(T jobj,
                      int storageId,
                      String fieldName)

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

Throws:

IllegalArgumentException - if storageId is non-positive

IllegalArgumentException - if jobj or fieldName is null

Method Detail

getStorageId

public int getStorageId()

Get the storage ID of the field that changed.

Returns:

changed field's storage ID

getFieldName

public String getFieldName()

Get the name of the field that changed.

Returns:

the name of the field that changed

equals

public boolean equals(Object obj)

Overrides:

equals in class Change<T>

hashCode

public int hashCode()

Overrides:

hashCode in class Change<T>