[groovy-user] Convert String "[1, 2, 3, 4, 5]" to ArrayList

[Dean Del Ponte]

What's the grooviest way to convert the String "[1, 2, 3, 4, 5]" to an ArrayList?

Thanks!

Dean

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[Mick Knutson]

Do you mean:

ArrayList list = [1, 2, 3, 4, 5]

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On Wed, May 5, 2010 at 3:55 PM, Dean Del Ponte <dean.d...@gmail.com> wrote:

[1, 2, 3, 4, 5]

[Nagelberg, Kallin]

How about

 

def var = Eval.me("[1,2,3]")

assert var.class == ArrayList

 

 

 

---

[Dean Del Ponte]

Sadly, no.  I'm being passed a String.  The String is "[1, 2, 3, 4, 5]".

I would like to convert it into the equivalent ArrayList of [1, 2, 3, 4, 5]

String s = "[1, 2, 3, 4, 5]"

ArrayList a = s converted to ArrayList

Does that help to clear it up?

- Dean

[Dean Del Ponte]

Thanks Kallin,

That worked great!  Do you know of hand what the security implications are of using Eval?  The string is being passed to me from a client's web browser.

- Dean

[Nagelberg, Kallin]

NP Dean. I suppose the security implications are pretty big in that case. Try running Eval.me("System.exit(0)") in the groovyConsole and you’ll see what I mean. You might want to have the client pass a JSON string instead which could be easily parsed into a list, and will throw an exception if it’s invalid json.

 

-Kal

[Alexander Veit]

> That worked great! Do you know of hand what the security
> implications are of using Eval? The string is being passed
> to me from a client's web browser.

Then you have to validate the syntax of the input before evaluating it.

-Alex


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[Nagelberg, Kallin]

Or if you know it’s always going to be a list like that you could do something ugly like

 

def clientString = "[1,2,3,4,5]"

 

ArrayList myList = clientString.replaceAll("\\[","").replaceAll("]","").split(",")

 

assert myList.class == ArrayList

 

myList.each{

    println "${it} [${it.class}]"

}

---

[Alexander Veit]

> > That worked great! Do you know of hand what the security
> > implications are of using Eval? The string is being passed
> > to me from a client's web browser.
>
> Then you have to validate the syntax of the input before
> evaluating it.

Or do sth. like this:

"[1, 2, 3, 4, 5, 6]"[1..-2].tokenize(',')*.toInteger()

[Nagelberg, Kallin]

Nice, I didn't know about that negative index on the range!

-Kal

-----Original Message-----
From: Alexander Veit [mailto:alexand...@gmx.net]
Sent: Wednesday, May 05, 2010 4:38 PM
To: us...@groovy.codehaus.org

[Jason Stell]

Or if you know it's a list of integers, how about this?:

def clientString = "[1,2,3,4,5]"

ArrayList<Integer> myList = clientString.replaceAll(/\D/,' ').split()*.toInteger()

Cheers

Jason

On Wed, May 5, 2010 at 3:18 PM, Nagelberg, Kallin <KNage...@globeandmail.com> wrote:

Or if you know it’s always going to be a list like that you could do something ugly like

 

def clientString = "[1,2,3,4,5]"

 

ArrayList myList = clientString.replaceAll("\\[","").replaceAll("]","").split(",").

[Dean Del Ponte]

Great help everyone!  Thanks!

[David Herman]

It looks like you're just being passed json so you should be able to do JSON.parse(theString)