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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.services.s3.model;

/**
 * Server-side Encryption Algorithm.
 */
public enum SSEAlgorithm {
    AES256("AES256"),
    KMS("aws:kms"),
    ;

    private final String algorithm;

    public String getAlgorithm() {
        return algorithm;
    }

    private SSEAlgorithm(String algorithm) {
        this.algorithm = algorithm;
    }

    @Override
    public String toString() {
        return algorithm;
    }

    /**
     * Returns the SSEAlgorithm enum corresponding to the given string;
     * or null if and only if the given algorithm is null.
     *
     * @throws IllegalArgumentException if the specified algorithm is not
     * supported.
     */
    public static SSEAlgorithm fromString(String algorithm) {
        if (algorithm == null)
            return null;
        for (SSEAlgorithm e: values()) {
            if (e.getAlgorithm().equals(algorithm))
                return e;
        }
        throw new IllegalArgumentException("Unsupported algorithm " + algorithm);
    }

    /**
     * Returns the default server side encryption algorithm, which is AES256.
     */
    public static SSEAlgorithm getDefault() {
        return AES256;
    }
}