com.amazonaws.services.dynamodbv2.datamodeling.marshallers.CollectionToListMarshaller 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.Collection;
import java.util.List;

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

public class CollectionToListMarshaller implements ListAttributeMarshaller {

    private static final CollectionToListMarshaller INSTANCE =
            new CollectionToListMarshaller();

    public static CollectionToListMarshaller instance() {
        return INSTANCE;
    }


    private final ArgumentMarshaller memberMarshaller;

    private CollectionToListMarshaller() {
        this(null);
    }

    public CollectionToListMarshaller(ArgumentMarshaller memberMarshaller) {
        this.memberMarshaller = memberMarshaller;
    }

    @Override
    public AttributeValue marshall(Object obj) {
        if (memberMarshaller == null) {
            throw new IllegalStateException(
                    "No member marshaller configured!");
        }

        Collection objects = (Collection) obj;
        List values =
                new ArrayList(objects.size());

        for (Object o : objects) {
            AttributeValue value;
            if (o == null) {
                value = new AttributeValue().withNULL(true);
            } else {
                value = memberMarshaller.marshall(o);
            }

            values.add(value);
        }

        AttributeValue result = new AttributeValue();
        result.setL(values);
        return result;
    }

    public ArgumentMarshaller getMemberMarshaller() {
        return memberMarshaller;
    }
}