<?php
/**
* Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the MIT License.  See License in the project root for license information.
* 
* OnenoteEntityHierarchyModel File
* PHP version 7
*
* @category  Library
* @package   Microsoft.Graph
* @copyright (c) Microsoft Corporation. All rights reserved.
* @license   https://opensource.org/licenses/MIT MIT License
* @link      https://graph.microsoft.com
*/
namespace Microsoft\Graph\Model;

/**
* OnenoteEntityHierarchyModel class
*
* @category  Model
* @package   Microsoft.Graph
* @copyright (c) Microsoft Corporation. All rights reserved.
* @license   https://opensource.org/licenses/MIT MIT License
* @link      https://graph.microsoft.com
*/
class OnenoteEntityHierarchyModel extends OnenoteEntitySchemaObjectModel
{
    /**
    * Gets the createdBy
    * Identity of the user, device, and application that created the item. Read-only.
    *
    * @return IdentitySet|null The createdBy
    */
    public function getCreatedBy()
    {
        if (array_key_exists("createdBy", $this->_propDict)) {
            if (is_a($this->_propDict["createdBy"], "\Microsoft\Graph\Model\IdentitySet") || is_null($this->_propDict["createdBy"])) {
                return $this->_propDict["createdBy"];
            } else {
                $this->_propDict["createdBy"] = new IdentitySet($this->_propDict["createdBy"]);
                return $this->_propDict["createdBy"];
            }
        }
        return null;
    }

    /**
    * Sets the createdBy
    * Identity of the user, device, and application that created the item. Read-only.
    *
    * @param IdentitySet $val The createdBy
    *
    * @return OnenoteEntityHierarchyModel
    */
    public function setCreatedBy($val)
    {
        $this->_propDict["createdBy"] = $val;
        return $this;
    }

    /**
    * Gets the displayName
    * The name of the notebook.
    *
    * @return string|null The displayName
    */
    public function getDisplayName()
    {
        if (array_key_exists("displayName", $this->_propDict)) {
            return $this->_propDict["displayName"];
        } else {
            return null;
        }
    }

    /**
    * Sets the displayName
    * The name of the notebook.
    *
    * @param string $val The displayName
    *
    * @return OnenoteEntityHierarchyModel
    */
    public function setDisplayName($val)
    {
        $this->_propDict["displayName"] = $val;
        return $this;
    }

    /**
    * Gets the lastModifiedBy
    * Identity of the user, device, and application that created the item. Read-only.
    *
    * @return IdentitySet|null The lastModifiedBy
    */
    public function getLastModifiedBy()
    {
        if (array_key_exists("lastModifiedBy", $this->_propDict)) {
            if (is_a($this->_propDict["lastModifiedBy"], "\Microsoft\Graph\Model\IdentitySet") || is_null($this->_propDict["lastModifiedBy"])) {
                return $this->_propDict["lastModifiedBy"];
            } else {
                $this->_propDict["lastModifiedBy"] = new IdentitySet($this->_propDict["lastModifiedBy"]);
                return $this->_propDict["lastModifiedBy"];
            }
        }
        return null;
    }

    /**
    * Sets the lastModifiedBy
    * Identity of the user, device, and application that created the item. Read-only.
    *
    * @param IdentitySet $val The lastModifiedBy
    *
    * @return OnenoteEntityHierarchyModel
    */
    public function setLastModifiedBy($val)
    {
        $this->_propDict["lastModifiedBy"] = $val;
        return $this;
    }

    /**
    * Gets the lastModifiedDateTime
    * The date and time when the notebook was last modified. The timestamp represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z. Read-only.
    *
    * @return \DateTime|null The lastModifiedDateTime
    */
    public function getLastModifiedDateTime()
    {
        if (array_key_exists("lastModifiedDateTime", $this->_propDict)) {
            if (is_a($this->_propDict["lastModifiedDateTime"], "\DateTime") || is_null($this->_propDict["lastModifiedDateTime"])) {
                return $this->_propDict["lastModifiedDateTime"];
            } else {
                $this->_propDict["lastModifiedDateTime"] = new \DateTime($this->_propDict["lastModifiedDateTime"]);
                return $this->_propDict["lastModifiedDateTime"];
            }
        }
        return null;
    }

    /**
    * Sets the lastModifiedDateTime
    * The date and time when the notebook was last modified. The timestamp represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z. Read-only.
    *
    * @param \DateTime $val The lastModifiedDateTime
    *
    * @return OnenoteEntityHierarchyModel
    */
    public function setLastModifiedDateTime($val)
    {
        $this->_propDict["lastModifiedDateTime"] = $val;
        return $this;
    }

}