Package software.amazon.awssdk.enhanced.dynamodb.mapper

Enum UpdateBehavior

java.lang.Object

java.lang.Enum<UpdateBehavior>

software.amazon.awssdk.enhanced.dynamodb.mapper.UpdateBehavior

All Implemented Interfaces:

Serializable, Comparable<UpdateBehavior>

@ThreadSafe
public enum UpdateBehavior
extends Enum<UpdateBehavior>

Update behaviors that can be applied to individual attributes. This behavior will only apply to 'update' operations such as UpdateItem, and not 'put' operations such as PutItem.

If an update behavior is not specified for an attribute, the default behavior of WRITE_ALWAYS will be applied.

Enum Constant Summary

Enum Constants

Enum Constant	Description
WRITE_ALWAYS	Always overwrite with the new value if one is provided, or remove any existing value if a null value is provided and 'ignoreNulls' is set to false.
WRITE_IF_NOT_EXISTS	Write the new value if there is no existing value in the persisted record or a new record is being written, otherwise leave the existing value.

Method Summary

Modifier and Type	Method	Description
static UpdateBehavior	valueOf(String name)	Returns the enum constant of this type with the specified name.
static UpdateBehavior[]	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

WRITE_ALWAYS

public static final UpdateBehavior WRITE_ALWAYS

Always overwrite with the new value if one is provided, or remove any existing value if a null value is provided and 'ignoreNulls' is set to false.

This is the default behavior applied to all attributes unless otherwise specified.

WRITE_IF_NOT_EXISTS

public static final UpdateBehavior WRITE_IF_NOT_EXISTS

Write the new value if there is no existing value in the persisted record or a new record is being written, otherwise leave the existing value.

IMPORTANT: If a null value is provided and 'ignoreNulls' is set to false, the attribute will always be removed from the persisted record as DynamoDb does not support conditional removal with this method.

Method Detail

values

public static UpdateBehavior[] 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 (UpdateBehavior c : UpdateBehavior.values())
    System.out.println(c);

Returns:

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

valueOf

public static UpdateBehavior valueOf(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:

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

NullPointerException - if the argument is null