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/*
 * Copyright 2010-2015 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.auth.policy;

/**
 * Represents a resource involved in an AWS access control policy statement.
 * Resources are the service specific AWS entities owned by your account. Amazon
 * SQS queues, Amazon S3 buckets and objects, and Amazon SNS topics are all
 * examples of AWS resources.
 * 
 * The standard way of specifying an AWS resource is with an Amazon Resource
 * Name (ARN).
 * 

 * The resource is C in the statement
 * "A has permission to do B to C where D applies."
 */
public class Resource {
    private final String resource;

    /**
     * Constructs a new AWS access control policy resource. Resources are
     * typically specified as Amazon Resource Names (ARNs).
     * 

     * You specify the resource using the following Amazon Resource Name (ARN)
     * format:
     * arn:aws:<vendor>:<region>:<namespace>:<relative-id>
     * 

     * 

     * vendor identifies the AWS product (e.g., sns)
     * region is the AWS Region the resource resides in (e.g., us-east-1),
     * if any
     * 
namespace is the AWS account ID with no hyphens (e.g., 123456789012)
     * 
relative-id is the service specific portion that identifies the
     * specific resource
     * 
     * 
     * For example, an Amazon SQS queue might be addressed with the following
     * ARN: arn:aws:sqs:us-east-1:987654321000:MyQueue
     * 
     * Some resources may not use every field in an ARN. For example, resources
     * in Amazon S3 are global, so they omit the region field:
     * arn:aws:s3:::bucket/*
     *
     * @param resource
     *            The Amazon Resource Name (ARN) uniquely identifying the
     *            desired AWS resource.
     */
    public Resource(String resource) {
        this.resource = resource;
    }

    /**
     * Returns the resource ID, typically an Amazon Resource Name (ARN),
     * identifying this resource.
     *
     * @return The resource ID, typically an Amazon Resource Name (ARN),
     *         identifying this resource.
     */
    public String getId() {
        return resource;
    }
}