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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2015-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package com.amazonaws.services.dynamodbv2.xspec;

import com.amazonaws.annotation.Beta;


/**
 * Represents an ADD action in the ADD section of an update expression.
 * 
 * 
Important
 * The ADD action only supports Number and set data types. In general, DynamoDB
 * recommends using SET rather than ADD.
 * 
 * Use the ADD action in an update expression to do either of the following:
 * 
 * If the attribute does not already exist, add the new attribute and its
 * value(s) to the item.
 * 
 * If the attribute already exists, then the behavior of ADD depends on the
 * attribute's data type:
 * 
 * If the attribute is a number, and the value you are adding is also a number,
 * then the value is mathematically added to the existing attribute. (If the
 * value is a negative number, then it is subtracted from the existing
 * attribute.)
 * 
 * If the attribute is a set, and the value you are adding is also a set, then
 * the value is appended to the existing set.
 * 
 * 
 * 
 * This object is as immutable (or unmodifiable) as the underlying value (of
 * type UnitOfExpression) given during construction.
 */
@Beta
public final class AddAction extends UpdateAction {
    AddAction(PathOperand attr, UnitOfExpression value) {
        super("ADD", attr, value);
    }
}