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A Java NIO FileSystem Provider for Amazon AWS S3

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package org.carlspring.cloud.storage.s3fs;

import java.util.function.Supplier;

import software.amazon.awssdk.profiles.ProfileFile;
import software.amazon.awssdk.regions.providers.AwsProfileRegionProvider;
import software.amazon.awssdk.regions.providers.AwsRegionProviderChain;
import software.amazon.awssdk.regions.providers.SystemSettingsRegionProvider;

/**
 * AWS Region provider that looks for the region in this order:
 * 
 *   Check the 'aws.region' system property for the region.
 *   Check the 'AWS_REGION' environment variable for the region.
 *   Check the {user.home}/.aws/credentials and {user.home}/.aws/config files for the region.
 * 
 */
public class S3AwsRegionProviderChain
        extends AwsRegionProviderChain
{

    private S3AwsRegionProviderChain(final S3AwsRegionProviderChain.Builder builder)
    {
        super(new SystemSettingsRegionProvider(),
              new AwsProfileRegionProvider(builder.profileFile, builder.profileName));
    }

    public static S3AwsRegionProviderChain.Builder builder()
    {
        return new S3AwsRegionProviderChain.Builder();
    }

    public static final class Builder
    {

        private Supplier profileFile;
        private String profileName;

        private Builder()
        {
        }

        public Builder profileFile(final Supplier profileFile)
        {
            this.profileFile = profileFile;
            return this;
        }

        public Builder profileName(final String profileName)
        {
            this.profileName = profileName;
            return this;
        }

        public S3AwsRegionProviderChain build()
        {
            return new S3AwsRegionProviderChain(this);
        }
    }
}