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    • com.amazonaws.services.dynamodbv2.document.AttributeUpdate Maven / Gradle / Ivy

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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 2014-2016 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.document;

import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;

import com.amazonaws.services.dynamodbv2.model.AttributeAction;

/**
 * Used to update an attribute. Each instance of AttributeUpdate includes the
 * name, action and new value to be used for modifying the attribute.
 * 
    
 * Typical usages:
 * 
    
 * new AttributeUpdate("strAttr").put("attrValue");
 * 
    
 * new AttributeUpdate("intAttr").addNumeric(42);
 * 
    
 * ...
 * 
    
 * 
    
 * See http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/
 * API_UpdateItem.html#DDB-UpdateItem-request-AttributeUpdates
 */
public class AttributeUpdate {

    private final String attributeName;

    private AttributeAction action;

    private Set attributeValues;

    private Object value;

    /**
     * Used to update an attribute. Each instance of AttributeUpdate includes the
     * name, action and new value to be used for modifying the attribute.
     * 
    
     * Typical usages:
     * 
    
     * new AttributeUpdate("strAttr").put("attrValue");
     * 
    
     * new AttributeUpdate("intAttr").addNumeric(42);
     * 
    
     * ...
     * 
    
     * 
    
     * See http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/
     * API_UpdateItem.html#DDB-UpdateItem-request-AttributeUpdates
     */
    public AttributeUpdate(String attributeName) {
        this.attributeName = attributeName;
    }

    /**
     * Used to update an attribute. Each instance of AttributeUpdate includes the
     * name, action and new value to be used for modifying the attribute.
     * 
    
     * Typical usages:
     * 
    
     * new AttributeUpdate("strAttr").put("attrValue");
     * 
    
     * new AttributeUpdate("intAttr").addNumeric(42);
     * 
    
     * ...
     * 
    
     * 
    
     * See http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/
     * API_UpdateItem.html#DDB-UpdateItem-request-AttributeUpdates
     */
    public AttributeUpdate put(Object attributeValue) {
        action = AttributeAction.PUT;
        this.value = attributeValue;
        return this;
    }

    public AttributeUpdate delete() {
        action = AttributeAction.DELETE;
        return this;
    }

    public AttributeUpdate removeElements(Object... elementsToBeRemoved) {
        action = AttributeAction.DELETE;
        this.attributeValues = Collections.unmodifiableSet(new LinkedHashSet(
                Arrays.asList(elementsToBeRemoved)));
        return this;
    }

    public AttributeUpdate addNumeric(Number value) {
        action = AttributeAction.ADD;
        this.value = value;
        return this;
    }

    public AttributeUpdate addElements(Object... newElements) {
        action = AttributeAction.ADD;
        this.attributeValues = Collections.unmodifiableSet(new LinkedHashSet(
                Arrays.asList(newElements)));
        return this;
    }

    public String getAttributeName() {
        return attributeName;
    }

    public AttributeAction getAction() {
        return action;
    }

    public Set getAttributeValues() {
        return attributeValues;
    }

    public Object getValue() {
        return value;
    }
}
    
    
    
    

    




    
    
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