java source code of CustomCredentialsProviderChain

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 * Copyright 2014 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.
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package com.amazonaws.services.kinesis.log4j.helpers;

import com.amazonaws.auth.AWSCredentialsProviderChain;
import com.amazonaws.auth.ClasspathPropertiesFileCredentialsProvider;
import com.amazonaws.auth.EnvironmentVariableCredentialsProvider;
import com.amazonaws.auth.InstanceProfileCredentialsProvider;
import com.amazonaws.auth.SystemPropertiesCredentialsProvider;

/**
 * 
 * Custom credentials provider chain to look for AWS credentials. Implementation
 * will look for credentials in the following priority:
 * <ul>
 * <li>AwsCredentials.properties file in classpath (must contain accessKey and
 * secretKey keys)</li>
 * <li>Instance profile credentials delivered through the Amazon EC2 metadata
 * <li>Environment Variables - AWS_ACCESS_KEY_ID and AWS_SECRET_KEY</li>
 * <li>Java System Properties - aws.accessKeyId and aws.secretKey</li>
 * service</li>
 * <ul>
 * 
 */
public final class CustomCredentialsProviderChain extends AWSCredentialsProviderChain {
  public CustomCredentialsProviderChain() {
    super(new ClasspathPropertiesFileCredentialsProvider(), new InstanceProfileCredentialsProvider(),
        new SystemPropertiesCredentialsProvider(), new EnvironmentVariableCredentialsProvider());
  }
}