Re: Configuration

Borut Bolčina Tue, 17 Jan 2006 23:20:12 -0800

Forgot to include my private method getConfiguration(), it does what Oliver suggests:

On 17.1.2006 20:50, Kfir Shay wrote:

Hi Borut,

take another look at the java doc for CompositeConfiguration
http://jakarta.apache.org/commons/configuration/apidocs/org/apache/commons/configuration/CompositeConfiguration.html

The method getConfiguration only take int argument so your example line -
CompositeConfiguration config = getConfiguration("configuration.xml");
simply won't work.

private CompositeConfiguration getConfiguration(String confDefinition) {
      ConfigurationFactory factory = new ConfigurationFactory(confDefinition);
      try {
         CompositeConfiguration config = (CompositeConfiguration) factory.getConfiguration();
         return config;
      } catch (ConfigurationException e) {
         e.printStackTrace();
      }
      return null;
   }

Also even if I create a CompositeConfiguration object manually using the getConfiguration method will return a Configuration object which means that doing something like this (this is your example)
XMLPropertiesConfiguration xc = (XMLPropertiesConfiguration) config.getConfiguration(2);
will throw a class cast exception.

If you get class cast exception then check your configuration.xml. Fist entry is index 0, not 1. Another check can be done by
if (config == null || !(config.getConfiguration(2) instanceof XMLConfiguration)) {
throw new Exception("Please check configuration.xml. Third entry should be XML conf file."); // or similar action
}

I am not trying to pick or anything but it seems like what you told me doesn't work.

That's ok, I was a bit sloppy.
--bb

Thanks,
Kfir S.
On 1/17/06, Borut Bolčina <[EMAIL PROTECTED]> wrote:
Hello,

if you want to have access to several configuration files from one place, then you should use
CompositeConfiguration config = getConfiguration("configuration.xml");

In configuration.xml you enumerate the config files you intend to use
<?xml version="1.0" encoding="ISO-8859-1" ?>
<configuration>
<properties fileName="Some.properties"/>
<properties fileName="Another.properties"/>
<xml filename="YetAnotherProperties.xml"/>
</configuration>

In the above case you can access values in all three property files through the same method calls, like
valueOfTypeLong = config.getLong("someKey", 300000);
valueOfTypeString = config.getString("anotherKey", "default value if this key not present");

If you want values from XML configuration file (YetAnotherProperties.xml) then you (for example):
List<String> keywords = config.getList("blogs.keyword");

You will get a collection of all values (value1, anotherValue) if XML config looks like
<feeds>
    <news>
        <keyword>http://www.aaa.com/feeds/12.xml</keyword>
        <keyword>http://www.bbb.com/feeds/16.xml</keyword>
        <keyword>http://www.ccc.com/feeds/18.xml</keyword>
    </news>
    <blogs>
        <keyword>value1</keyword>
        <keyword>anotherValue</keyword>
    </blogs>
</feeds>

Now, if you want an explicit configuration out of CompositeConfiguration then you can by
PropertiesConfiguration pc = (PropertiesConfiguration) config.getConfiguration(0);
or
XMLPropertiesConfiguration xc = (XMLPropertiesConfiguration) config.getConfiguration(2);
if using the above configuration.xml file.

Hope this helps,
Borut
On 17.1.2006 5:26, Kfir Shay wrote:

Hi, I am a bit confused about the documentation inconsistencies in the commons configuration package.
In the "ConfigurationFactory Howto" document in the section called "The configuration definition file" it is stated that the xml element creates an instance of XMLConfiguration: "The xml element can be used to load XML configuration files. It also uses the fileName attribute to determine the name of the file to load and creates an instance of XMLConfiguration." Yet earlier in the "Accessing properties" section it is stated that ConfigurationFactory only return a configuration object via the getConfiguration() method: "Whatever way we used to load the configuration factory, we should now have a Configuration object that was returned by the factory's getConfiguration() method. This object is actually an instance of the CompositeConfiguration class" c\Currently my configuration consist of only one xml file but I want to use the ConfigurationFactory and leverage the config.xml file for the case that more configuration files will be added in the future (most probably all will be in xml format) but at the same time I need to get a XMLConfiguration object not the more general Configuration object can someone please clarify how to achieve this. This is my first post to the list, I hope some of you will take the time to give me an answer. Thanks, Kfir S. AIM:kingink24 Email: [EMAIL PROTECTED]
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Re: Configuration

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