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The AWS Java Mobile SDK for Amazon S3 module holds the client classes that are used for communicating with Amazon Simple Storage Service

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/*
 * Copyright 2010-2018 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.
 * 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.s3.model.transform;

import com.amazonaws.AmazonClientException;
import com.amazonaws.services.s3.internal.XmlWriter;
import com.amazonaws.services.s3.model.PartETag;
import com.amazonaws.services.s3.model.RestoreObjectRequest;

import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class RequestXmlFactory {

    /**
     * Converts the specified list of PartETags to an XML fragment that can be
     * sent to the CompleteMultipartUpload operation of Amazon S3.
     *
     * @param partETags The list of part ETags containing the data to include in
     *            the new XML fragment.
     * @return A byte array containing the data
     */
    public static byte[] convertToXmlByteArray(List partETags) {
        XmlWriter xml = new XmlWriter();
        xml.start("CompleteMultipartUpload");
        if (partETags != null) {
            Collections.sort(partETags, new Comparator() {
                @Override
                public int compare(PartETag tag1, PartETag tag2) {
                    if (tag1.getPartNumber() < tag2.getPartNumber())
                        return -1;
                    if (tag1.getPartNumber() > tag2.getPartNumber())
                        return 1;
                    return 0;
                }
            });

            for (PartETag partEtag : partETags) {
                xml.start("Part");
                xml.start("PartNumber").value(Integer.toString(partEtag.getPartNumber())).end();
                xml.start("ETag").value(partEtag.getETag()).end();
                xml.end();
            }
        }
        xml.end();

        return xml.getBytes();
    }

    /**
     * Converts the RestoreObjectRequest to an XML fragment that can be sent to
     * the RestoreObject operation of Amazon S3.
     *
     * @param restoreObjectRequest The container which provides options for
     *            restoring an object, which was transitioned to the Glacier
     *            from S3 when it was expired, into S3 again.
     * @return A byte array containing the data
     * @throws AmazonClientException
     */
    public static byte[] convertToXmlByteArray(RestoreObjectRequest restoreObjectRequest)
            throws AmazonClientException {
        XmlWriter xml = new XmlWriter();

        xml.start("RestoreRequest");
        xml.start("Days").value(Integer.toString(restoreObjectRequest.getExpirationInDays())).end();
        xml.end();

        return xml.getBytes();
    }
}