de.aristaflow.adept2.model.common.changetracking

Enum ChangeType

java.lang.Object

java.lang.Enum<ChangeType>

de.aristaflow.adept2.model.common.changetracking.ChangeType

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<ChangeType>

public enum ChangeType
extends java.lang.Enum<ChangeType>

A type for specifying changes to elements of a collection-based property.

Author:

Ulrich Kreher

Enum Constant Summary

Enum Constants

Enum Constant and Description
ADDED A specific element has been added to a collection-based property.
CHANGED A specific element has been changed in a collection-based property.
NONE No change occurred.
REMOVED A specific element has been removed from a collection-based property.

Method Summary

Modifier and Type	Method and Description
static ChangeType	getChangeType(java.lang.Object oldValue, java.lang.Object newValue) Gets the change type for the designated values, that is if the old value is null but the new value not, the change type will be ADDED, if the new value is null but the old value not, the change type will be REMOVED, if both values are equal (with respect to Object.equals(Object)), NONE will be returned , otherwise it will be CHANGED .
static ChangeType	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static ChangeType[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

NONE

public static final ChangeType NONE

No change occurred. This is required for combining changes which may result in a null change.

ADDED

public static final ChangeType ADDED

A specific element has been added to a collection-based property.

CHANGED

public static final ChangeType CHANGED

A specific element has been changed in a collection-based property. This is only useful for mutable objects. Usually they in turn should track their own changes.

REMOVED

public static final ChangeType REMOVED

A specific element has been removed from a collection-based property.

Method Detail

values

public static ChangeType[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (ChangeType c : ChangeType.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static ChangeType valueOf(java.lang.String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

getChangeType

public static ChangeType getChangeType(java.lang.Object oldValue,
                                       java.lang.Object newValue)

Gets the change type for the designated values, that is

• if the old value is null but the new value not, the change type will be ADDED,
• if the new value is null but the old value not, the change type will be REMOVED,
• if both values are equal (with respect to Object.equals(Object)), NONE will be returned ,
• otherwise it will be CHANGED

.

Parameters:

oldValue - The old value for which to determine the change type.

newValue - The new value for which to determine the change type.

Returns:

The change type depending on which of the values is null and whether they are different.