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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 2014-2024 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.Calendar;
import java.util.List;
import java.util.Set;

import com.amazonaws.services.dynamodbv2.datamodeling.ArgumentMarshaller.StringSetAttributeMarshaller;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.util.DateUtils;

/**
 * A marshaller that marshals sets of Java {@code Calendar} objects into
 * DynamoDB StringSets (in ISO 8601 format, ie {"2014-01-01T00:00:00Z", ...}).
 */
public class CalendarSetToStringSetMarshaller
        implements StringSetAttributeMarshaller {

    private static final CalendarSetToStringSetMarshaller INSTANCE =
            new CalendarSetToStringSetMarshaller();

    public static CalendarSetToStringSetMarshaller instance() {
        return INSTANCE;
    }

    private CalendarSetToStringSetMarshaller() {
    }

    @Override
    public AttributeValue marshall(Object obj) {
        @SuppressWarnings("unchecked")
        Set dates = (Set) obj;

        List timestamps = new ArrayList(dates.size());
        for (Calendar date : dates) {
            timestamps.add(DateUtils.formatISO8601Date(date.getTime()));
        }

        return new AttributeValue().withSS(timestamps);
    }
}