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The AWS Java SDK for Amazon DynamoDB module holds the client classes that are used for communicating with Amazon DynamoDB Service
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/*
 * Copyright 2011-2018 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.
 * You may obtain a copy of the License at:
 *
 *    http://aws.amazon.com/apache2.0
 *
 * 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.datamodeling;

import java.util.HashMap;
import java.util.Map;

import com.amazonaws.services.dynamodbv2.model.ConditionalOperator;
import com.amazonaws.services.dynamodbv2.model.ExpectedAttributeValue;

/**
 * Enables adding options to a save operation.
 * For example, you may want to save only if an attribute has a particular value.
 * @see DynamoDBMapper#save(Object, DynamoDBSaveExpression)
 */
public class DynamoDBSaveExpression {

    /** Optional expected attributes */
    private Map expectedAttributes;

    /**
     * The logical operator on the expected value conditions of this save
     * operation.
     */
    private String conditionalOperator;

    /**
     * Gets the map of attribute names to expected attribute values to check on save.
     * 
     * @return The map of attribute names to expected attribute value conditions to check on save
     */
    public Map getExpected() {
        return expectedAttributes;
    }

    /**
     * Sets the expected condition to the map of attribute names to expected attribute values given.
     * 
     * @param expectedAttributes
     *            The map of attribute names to expected attribute value conditions to check on save
     */
    public void setExpected(Map expectedAttributes) {
        this.expectedAttributes = expectedAttributes;
    }

    /**
     * Sets the expected condition to the map of attribute names to expected
     * attribute values given and returns a pointer to this object for
     * method-chaining.
     * 
     * @param expectedAttributes
     *            The map of attribute names to expected attribute value
     *            conditions to check on save
     */
    public DynamoDBSaveExpression withExpected(Map expectedAttributes) {
        setExpected(expectedAttributes);
        return this;
    }

    /**
     * Adds one entry to the expected conditions and returns a pointer to this
     * object for method-chaining.
     * 
     * @param attributeName
     *            The name of the attribute.
     * @param expected
     *            The expected attribute value.
     */
    public DynamoDBSaveExpression withExpectedEntry(String attributeName, ExpectedAttributeValue expected) {
        if (expectedAttributes == null) {
            expectedAttributes = new HashMap();
        }
        expectedAttributes.put(attributeName, expected);
        return this;
    }

    /**
     * Returns the logical operator on the expected value conditions of this save
     * operation.
     */
    public String getConditionalOperator() {
        return conditionalOperator;
    }

    /**
     * Sets the logical operator on the expected value conditions of this save
     * operation.
     */
    public void setConditionalOperator(String conditionalOperator) {
        this.conditionalOperator = conditionalOperator;
    }

    /**
     * Sets the logical operator on the expected value conditions of this save
     * operation and returns a pointer to this object for method-chaining.
     */
    public DynamoDBSaveExpression withConditionalOperator(String conditionalOperator) {
        setConditionalOperator(conditionalOperator);
        return this;
    }
    
    /**
     * Sets the logical operator on the expected value conditions of this save
     * operation. 
     */
    public void setConditionalOperator(ConditionalOperator conditionalOperator) {
        setConditionalOperator(conditionalOperator.toString());
    }

    /**
     * Sets the logical operator on the expected value conditions of this save
     * operation and returns a pointer to this object for method-chaining.
     */
    public DynamoDBSaveExpression withConditionalOperator(ConditionalOperator conditionalOperator) {
        return withConditionalOperator(conditionalOperator.toString());
    }
}