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XmlIO - New function proposal [message #8602]

Tue, 20 March 2007 23:22

victorb
Messages: 78
Registered: December 2005
Location: Nice, France

Member

My application is using XML to store/retrieve data. Many elements are using the same default value. In this case I don't want to store the attribute value in the XML but I want it restored to a default value (instead of Null) when reading the configuration back. I have added this new function to XmlIO class

	template <class T> XmlIO Attr(const char *id, T& var, T def) {
		if(IsLoading()) {
			XmlAttrLoad(var, node.Attr(id));
			var = Nvl(var, def);
		} else if (var != def) 
			node.SetAttr(id, XmlAttrStore(var));		
		return *this;
	}

Do you think it might be useful to have this in standard Upp ?

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Re: XmlIO - New function proposal [message #8605 is a reply to message #8602]

Tue, 20 March 2007 23:54

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

This is a good idea, but it would IMHO require a little bit more complex change; the trouble is that XmlAttrLoad do not always use Null as the default value.

Maybe we should change it so that XmlAttrLoad would not set the value if it is missing? Or add another parameter to XmlAttrLoad?

Mirek

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Re: XmlIO - New function proposal [message #8607 is a reply to message #8605]

Wed, 21 March 2007 08:45

victorb
Messages: 78
Registered: December 2005
Location: Nice, France

Member

Oops... you are right about XmlAttrLoad not always returning Null and thanks for pointing me to the right direction "Maybe we should change it so that XmlAttrLoad would not set the value if it is missing?"

The following function should do the trick:

	template <class T> XmlIO Attr(const char *id, T& var, T def) {
		if(IsLoading())
		    if (IsNull(node.Attr(id)))
				var = def;
		    else
				XmlAttrLoad(var, node.Attr(id));		        
	 	else if (var != def) 
				node.SetAttr(id, XmlAttrStore(var));		
		return *this;
	}

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Re: XmlIO - New function proposal [message #8713 is a reply to message #8607]

Mon, 26 March 2007 21:47

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

I like it. Now in Core.

Mirek

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