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Re: Reading a properties file so that keys can be retrieved in order

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  Re: Reading a properties file so that keys can be retrieved in order etienne.studer@gradleware.com - 2014-12-12 08:40 -0800
    Re: Reading a properties file so that keys can be retrieved in order Arne Vajhøj <arne@vajhoej.dk> - 2014-12-12 19:02 -0500
      Re: Reading a properties file so that keys can be retrieved in order Robert Klemme <shortcutter@googlemail.com> - 2014-12-16 13:14 +0100

#30550 — Re: Reading a properties file so that keys can be retrieved in order

On Thursday, May 12, 2011 9:53:59 PM UTC+2, laredo...@zipmail.com wrote:
> Hi,
> 
> I'm using Java 1.6.  Let's say I have a properties file ...
> 
> a=1
> b=2
> c=3
> ...
> 
> How can i read the properties file in Java such that when I retrieve
> the key set, the iterator structure would return the keys in the order
> they are found in the file (in the above example, "a", "b", "c")?
> 
> Thanks, - Dave

See https://github.com/etiennestuder/java-ordered-properties for a complete implementation that allows to read/write properties files in a well-defined order.

OrderedProperties properties = new OrderedProperties();
properties.load(new FileInputStream(new File("~/some.properties")));

The OrderedProperties class will solve your requirement.

Kind regards, Etienne

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#30557

On 12/12/2014 11:40 AM, etienne.studer@gradleware.com wrote:
> On Thursday, May 12, 2011 9:53:59 PM UTC+2, laredo...@zipmail.com wrote:
>> I'm using Java 1.6.  Let's say I have a properties file ...
>>
>> a=1
>> b=2
>> c=3
>> ...
>>
>> How can i read the properties file in Java such that when I retrieve
>> the key set, the iterator structure would return the keys in the order
>> they are found in the file (in the above example, "a", "b", "c")?
>
> See https://github.com/etiennestuder/java-ordered-properties for a complete implementation that allows to read/write properties files in a well-defined order.
>
> OrderedProperties properties = new OrderedProperties();
> properties.load(new FileInputStream(new File("~/some.properties")));
>
> The OrderedProperties class will solve your requirement.

The question is 3.5 years old.

Arne

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#30574

On 13.12.2014 01:02, Arne Vajhøj wrote:
> On 12/12/2014 11:40 AM, etienne.studer@gradleware.com wrote:

>> OrderedProperties properties = new OrderedProperties();
>> properties.load(new FileInputStream(new File("~/some.properties")));

The input stream is not properly closed as far as I can see.

>> The OrderedProperties class will solve your requirement.
>
> The question is 3.5 years old.

Maybe it took him so long...

I am more concerned with the usefulness of this approach.  Properties 
are simply unordered and I think no special semantic should be applied 
to that order.  This is fragile.  If order is needed it is much better 
to choose property names accordingly and this is also what most people 
seem to do.

foo.bar.name.2=World
foo.bar.name.1=Hello
foo.bar.name.3=!

If it gets fancier than that then maybe properties are not the proper tool.

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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