On 7/12/14, 9:52 AM, Oliver Heger wrote:
> Hi Ronald,
>
> I have not used ExprLookup myself, so I am not sure whether I am a big
> help here.
>
> Your declaration of the lookup seems to be correct, otherwise an
> exception would be thrown by DefaultConfigurationBuilder.
>
> A difference between your code and the example in the user's guide is
> that in the latter the expression lookup is directly used in the file
> read by DefaultConfigurationBuilder and not in one of the included
> configuration files. For version 2.0 (which is work in progress) this
> should be supported, but I am not sure whether this also works in 1.x.
>
> I would recommend to start with a simple example first. Test whether you
> can access the lookup directly in this xml file, e.g. by setting the
> file name of a configuration source as demonstrated in the example. By
> this you can find out the results of variable substitutions and compare
> them with your expectations. Only if this works as expected, try again
> to use the lookup in an included configuration source.
I also have no experience using this feature, but IIUC you are
trying to use "expr" as a prefix. According to the doc, that is not
among the supported prefixes.
Phil
>
> HTH
> Oliver
>
> Am 11.07.2014 17:27, schrieb DiFrango, Ronald (CONT):
>> Here's the full XML file:
>>
>> <?xml version="1.0" encoding="ISO-8859-1" ?>
>>
>> <configuration>
>> <header>
>> <result />
>> <lookups>
>> <lookup config-prefix="expr"
>>
>> config-class="org.apache.commons.configuration.interpol.ExprLookup">
>> <variables>
>> <variable name="net"
>> value="Class:java.net.InetAddress" />
>> </variables>
>> </lookup>
>> </lookups>
>> </header>
>>
>> <system />
>>
>> <properties fileName=" example.properties" listDelimiter="|">
>> <reloadingStrategy refreshDelay="10000"
>>
>> config-class="org.apache.commons.configuration.reloading.FileChangedReloadingStrategy"
>> />
>> </properties>
>>
>> </configuration>
>>
>> And the referenced properties file:
>>
>> mobile.rest.host=${expr:$[net.localHost.hostName]}
>>
>>
>> Ron DiFrango
>>
>>
>>
>> -----Original Message-----
>> From: Martin Gainty [mailto:mgai...@hotmail.com]
>> Sent: Friday, July 11, 2014 11:25 AM
>> To: Commons Users List
>> Subject: RE: Commons Config: Variable Interpolation
>>
>>
>>
>>> From: ronald.difra...@capitalone.com
>>> To: user@commons.apache.org
>>> Date: Fri, 11 Jul 2014 11:02:45 -0400
>>> Subject: RE: Commons Config: Variable Interpolation
>>>
>>> Just to complete it, the code looks like:
>>>
>>> DefaultConfigurationBuilder factory = new
>>> DefaultConfigurationBuilder("example.xml");
>>> Configuration config = factory.getConfiguration();
>> MG>no clue which properties are defined in example.xml so lets add a new
>> MG>property called mobile.rest.host here
>> MG>config.addProperty("mobile.rest.host", "maps.google.com");
>>
>>> System.out.println("Host Name = " +
>>> config.getString("mobile.rest.host"));
>> MG>?
>>> Ron DiFrango
>>>
>>>
>>> -----Original Message-----
>>> From: DiFrango, Ronald (CONT) [mailto:ronald.difra...@capitalone.com]
>>> Sent: Friday, July 11, 2014 10:49 AM
>>> To: user@commons.apache.org
>>> Subject: Commons Config: Variable Interpolation
>>>
>>> I'm attempting to perform Variable Interpolation as outlined here:
>>>
>>> http://commons.apache.org/proper/commons-configuration/userguide/howto
>>> _basicfeatures.html#Variable_Interpolation
>>>
>>> I'm using an XML file as the starter so I added the following blurb to the
>>> beginning of the file:
>>>
>>> <header>
>>> <result />
>>> <lookups>
>>> <lookup config-prefix="expr"
>>>
>>> config-class="org.apache.commons.configuration.interpol.ExprLookup">
>>> <variables>
>>> <variable name="net"
>>> value="Class:java.net.InetAddress" />
>>> </variables>
>>> </lookup>
>>> </lookups>
>>> </header>
>> MG>
>> <override>
>> <xml mobileRestHost="String.lowercase(net.localHost.hostName)"></xml>
>> </override>
>> MG>?
>>
>>> And then in my properties file that is loaded I did:
>>>
>>> mobile.rest.host=${expr:$[net.localHost.hostName]}
>>>
>>> But it did not work any thoughts on what I'm doing wrong?
>>>
>>> Thanks,
>>>
>>> Ron
>>>
>>>
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