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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.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.util;

import com.amazonaws.AmazonWebServiceRequest;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.internal.StaticCredentialsProvider;

public class CredentialUtils {

    /**
     *  Returns the credentials provider that will be used to fetch the
     *  credentials when signing the request. Request specific credentials
     *  takes precedence over the credentials/credentials provider set in the
     *  client.
     */
    public static AWSCredentialsProvider getCredentialsProvider(
            AmazonWebServiceRequest req,
            AWSCredentialsProvider base) {

        if (req != null && req.getRequestCredentials() != null) {
            return new StaticCredentialsProvider(req.getRequestCredentials());
        }
        return base;
    }
}