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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 2013-2016 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.transfer;

/**
 * The status of a pause operation initiated on a {@link Upload}/
 * {@link Download}.
 */
public enum PauseStatus {

    /**
     * transfer successfully paused (and therefore the return information can be
     * used to resume the transfer later on)
     */
    SUCCESS,

    /**
     * pause is not yet applicable since transfer has not started; so no action
     * taken
     */
    NOT_STARTED,

    /**
     * pause is not yet applicable since transfer has not started AND cancel was
     * requested; so we cancel it
     */
    CANCELLED_BEFORE_START,

    /**
     * pause is not possible while transfer is already in progress; so no action
     * taken
     */
    NO_EFFECT,

    /**
     * pause is not possible while transfer is already in progress AND cancel
     * was requested; so we cancel it
     */
    CANCELLED, ;

    /**
     * Returns true if the transfer is paused else false.
     */
    public boolean isPaused() {
        return this == SUCCESS;
    }

    /**
     * Returns true if the transfer is cancelled else false.
     */
    public boolean isCancelled() {
        return this == CANCELLED || this == CANCELLED_BEFORE_START;
    }

    /**
     * Returns true if the transfer is not started or the pause operation has no
     * effect on the transfer.
     */
    public boolean unchanged() {
        return this == NOT_STARTED || this == NO_EFFECT;
    }
}