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From "Gokul Nanthakumar C (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LANG-790) Null safe Navigation in ObjectUtils
Date Tue, 06 Mar 2012 23:41:57 GMT

    [ https://issues.apache.org/jira/browse/LANG-790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223818#comment-13223818
] 

Gokul Nanthakumar C commented on LANG-790:
------------------------------------------

Thanks for your Comment Gary, Below is what I am thinking about it

IMO, the request is not for another expression language or interpreter, it is for just an
utility method for easy navigation.

you can see lot of codes like 

if(a!=null && a.getB()!=null && a.getB().getC())

in so many places, so basically we have some navigation issue with Null, having a reusable
Util method to this problem is what I am looking for.

Simple solution I can propose here is using Reflect navigate through the object, if any Null
encountered in the requested path, just return the default value.

JXPath - I already listed the reasons why JXPath is not ideal for this issue IMO.

JavaScript in Java6 - I guess this is not a solution for the problem we are trying to solve
in Java, converting Java Object to java script object each time may not be a good choice,
if this is the choice even we can use groovy or any other languages supported by JVM to solve
this problem, the main objective is to find easy solution with in java not outside.

You say "as soon you invent a language today, you'll need more tomorrow" , yes true that is
the nature and I dont see any mistake with this, this how a language or anything can evolve
and mature, if we are not looking for more there will not be any growth in anything.

for your question on Arrays, Collections, Maps --> when we can navigate an object safely
on nulls, we can do so in these as well, after all they are all just group of Objects.

for your question on Private Methods --> I am not sure what is your point with Private
methods.

for your point on Full Interpreter --> I am not sure what is the need of interpreter in
this case.

Please share your view, thanks.
                
> Null safe Navigation in ObjectUtils
> -----------------------------------
>
>                 Key: LANG-790
>                 URL: https://issues.apache.org/jira/browse/LANG-790
>             Project: Commons Lang
>          Issue Type: New Feature
>            Reporter: Gokul Nanthakumar C
>
> Adding a method for null safe navigation of objects will be very helpful. for example
a method like
> ObjectUtils.getValue(Object obj, String "path", String defaultValue); 
> ex :ObjectUtils.getValue(myObject, "x.y.z", "default");
> it will navigate in the myObject like myObject.getX().getY().getZ(), if any thing in
the path is null (x,y or z), it will return the default value.
> It will be really useful, it is like null safe navigation in groovy.

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