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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 2015-2016 Amazon Technologies, Inc.
 *
 * 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.s3.transfer;

import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Encryption;
import com.amazonaws.services.s3.internal.ServiceUtils;
import com.amazonaws.services.s3.internal.SkipMd5CheckStrategy;
import com.amazonaws.services.s3.model.GetObjectRequest;
import com.amazonaws.services.s3.model.S3Object;
import com.amazonaws.services.s3.transfer.internal.DownloadImpl;

final class DownloadTaskImpl implements
        ServiceUtils.RetryableS3DownloadTask
{
    private final AmazonS3 s3;
    private final DownloadImpl download;
    private final GetObjectRequest getObjectRequest;
    private final SkipMd5CheckStrategy skipMd5CheckStrategy = SkipMd5CheckStrategy.INSTANCE;

    DownloadTaskImpl(AmazonS3 s3, DownloadImpl download,
            GetObjectRequest getObjectRequest) {
        this.s3 = s3;
        this.download = download;
        this.getObjectRequest = getObjectRequest;
    }

    @Override
    public S3Object getS3ObjectStream() {
        S3Object s3Object = s3.getObject(getObjectRequest);
        download.setS3Object(s3Object);
        return s3Object;
    }

    @Override
    public boolean needIntegrityCheck() {
        // Don't perform the integrity check if the checksum won't matchup.
        return !(s3 instanceof AmazonS3Encryption) && !skipMd5CheckStrategy.skipClientSideValidationPerRequest(getObjectRequest);
    }
}