Dear List,
I am new to this list and XML in general.
I'd like to use XML to feed parameters in our modular C++ application.
Modular in the sense that, depending on the configuration (determined at
program startup), different types of objects are created through a
factory.
Example:
Class A
{
Helper* h;
}
Class ColoredHelper : public Helper
{..}
Class StripedHelper : public Helper
{..}
On construction an instances of A the factory creates the helper
according to the configuration file and lets h point to it.
The problems we are facing are:
a)
The configuration file must be made consistent. I am thinking of a XML
schema, which describes all possible classes that can be used as
Helper's. With the help of this xsd the configuration can be validated,
or maybe can be transformed into a GUI. Before starting the application
the configuration file can easily be checked against the schema.
b)
Parametrization of the Helpers. The different helpers might need
different parameters (ColorHelper maybe only one, whereas StripedHelper
needs two parameters). I am thinking of XML fragments, which are parsed
by the helper object to extract the appropriate parameters.
At the moment I am considering the Xerces parser in SAX mode. Is this
the right decision, or should I rather go for DOM?
Can XML fragments be passed to another object for parsing (upon
detection of the helpers token)? Or should I add new callback functions
according to the object generated?
Is the approach feasible, or am I missing something fundamentally?
Thank your for your help!
Yours,
Michael
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