Solved

Simple question: hows to dynamically reference a class object

Posted on 2011-03-16
7
333 Views
Last Modified: 2012-08-14
Hi i  need a little help as my brain has gone dark on me :-)

i have the below object backupCartItem (simplified)

and i have a function which needs to reference different properties within the different contained objects.

public function createEndorcementItem( propertyClass:String, propertyName:String ):void
{
var val:* = backupCartItem[ propertyClass ][ propertyName ];
trace( val.toString();
}

public function doSomething():void
{
createEndorcementItem( 'sessionVO.primaryInsurie', 'AGE_NOW');
}


the above little script example should set val to being
backupCartItem.sessionVO.primaryInsurie.AGE_NOW

but it throws an error

Property sessionVO.primaryInsurie not found on com.travins.cairngorm.model.CartItemVO

how can i dynamically reference the object please






      backupCartItem      com.travins.cairngorm.model.CartItemVO (@70bd781)      
            admin_fee      0      
            id      1174 [0x496]      
            sessionVO      com.travins.cairngorm.model.CurrentSessionVO (@27a2881)      
                  ADULT_COUNT      1      
                  CHILD_COUNT      0      
                  primaryInsurie      com.travins.cairngorm.model.InsurieVO (@1fa5dc1)      
                        AGE_AT_START_TIME      40 [0x28]      
                        AGE_ERROR      ""      
                        AGE_IS_VALID      true      
                        AGE_NOW      40 [0x28]      
                        COUNTRY_ID      1      
                        DATE_OF_BIRTH      Date (@71dbcd1)      
0
Comment
Question by:cghrmauritius
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 2
7 Comments
 
LVL 29

Accepted Solution

by:
dgofman earned 500 total points
ID: 35149658
Hi,
You mixed in your code setter and getter that reason why you confused yourself.
Check if this what you want:

private var backupCartItem:Object;

			public function createEndorcementItem( propertyClass:String, propertyName:String, value:*):void
			{
				if(backupCartItem == null)
					backupCartItem = {};
				if(backupCartItem[propertyClass] == undefined)
					backupCartItem[propertyClass] = {};
				backupCartItem[propertyClass][propertyName] = value;
			}
			
			public function getEndorcementItem( propertyClass:String, propertyName:String ):void
			{
				var val:* = backupCartItem[propertyClass][propertyName];
				trace( val.toString());
			}
			
			public function doSomething():void
			{
				createEndorcementItem( 'sessionVO.primaryInsurie', 'AGE_NOW', 25);
				getEndorcementItem( 'sessionVO.primaryInsurie', 'AGE_NOW');
			}

Open in new window

0
 

Author Comment

by:cghrmauritius
ID: 35149839
humm no sorry i needed it the other way round im not trying to set the value im trying to get the value of

backupCartItem[ propertyClass ][ propertyName ]

i know there is a value cause if i query it manually as

backupCartItem.sessionVO.primaryInsurie.AGE_NOW  i do ge the cirrect value but i cant get it when using the square brackets

any ideas please
0
 

Author Comment

by:cghrmauritius
ID: 35150016
i see yuor example does work, i must have something wrong with my backupcartItem but i dont understand why because i can get the value if done manually

thanks i will assign you the points

thanks for your time
0
Guide to Performance: Optimization & Monitoring

Nowadays, monitoring is a mixture of tools, systems, and codes—making it a very complex process. And with this complexity, comes variables for failure. Get DZone’s new Guide to Performance to learn how to proactively find these variables and solve them before a disruption occurs.

 

Author Closing Comment

by:cghrmauritius
ID: 35150021
Thanks
0
 

Author Comment

by:cghrmauritius
ID: 35150077
Actually if checked in debuger your example isnt right im afraid

backupCartItem      Object (@8cb9421)      
      sessionVO.primaryInsurie      Object (@8cb93f9)      
            AGE_NOW      25 [0x19]      


as per my original which is what my object dump looks like

backupCartItem      com.travins.cairngorm.model.CartItemVO (@70bd781)      
             sessionVO      com.travins.cairngorm.model.CurrentSessionVO (@27a2881)      
                   primaryInsurie      com.travins.cairngorm.model.InsurieVO (@1fa5dc1)      
                        AGE_IS_VALID      true      
                        AGE_NOW      40 [0x28]      

please notice that in your example the primaryInsurie object isnt nested inside sessionVO

0
 

Author Comment

by:cghrmauritius
ID: 35150262
ok i have found a solution finally your comment gave me an idea which worked so thanks for the pointers


here is my solution but im sure its a dirty method and that there must be a cleaner way!!!

public function createEndorcementItem( propertyClass:String, propertyName:String ):void
{
	var arr:Array = propertyClass.split(".");
				
	var cur:Object;
	cur = backupCartItem;
				
	for each (var a:String in arr)
	{
		cur = cur[a];
	}
	var val:* = cur[propertyName];
}

Open in new window

0
 
LVL 29

Expert Comment

by:dgofman
ID: 35150302
I am very happy to know I helped you.
Regards,
David
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Developer portfolios can be a bit of an enigma—how do you present yourself to employers without burying them in lines of code?  A modern portfolio is more than just work samples, it’s also a statement of how you work.
When crafting your “Why Us” page, there are a plethora of pitfalls to avoid. Follow these five tips, and you’ll be well on your way to creating an effective page.
This video teaches users how to migrate an existing Wordpress website to a new domain.
The viewer will learn how to count occurrences of each item in an array.

738 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question