com.amazonaws.services.dynamodbv2.datamodeling.marshallers.BooleanSetToNumberSetMarshaller 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.
 * 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.marshallers;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import com.amazonaws.services.dynamodbv2.datamodeling.ArgumentMarshaller.NumberSetAttributeMarshaller;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;

/**
 * A legacy marshaller that marshals sets of Java {@code Booleans} into DynamoDB
 * NumberSets, representing {@code true} as '1' and {@code false} as '0'.
 * Retained for backwards compatibility with older versions of the mapper which
 * don't know about the DynamoDB BOOL type.
 */
public class BooleanSetToNumberSetMarshaller
        implements NumberSetAttributeMarshaller {

    private static final BooleanSetToNumberSetMarshaller INSTANCE =
            new BooleanSetToNumberSetMarshaller();

    public static BooleanSetToNumberSetMarshaller instance() {
        return INSTANCE;
    }

    private BooleanSetToNumberSetMarshaller() {
    }

    @Override
    public AttributeValue marshall(Object obj) {
        @SuppressWarnings("unchecked")
        Set booleans = (Set) obj;
        List booleanAttributes = new ArrayList(booleans.size());

        for (Boolean b : booleans) {
            if (b == null || b == false) {
                booleanAttributes.add("0");
            } else {
                booleanAttributes.add("1");
            }
        }

        return new AttributeValue().withNS(booleanAttributes);
    }
}