Re: [xml-dev] Designing constructor for QName class

["Radu Cernuta" <radu.cernuta@gmail.com>]

I supose by 
"QName(String lname, String namespace = String())"
you mean something like

class QName{
    private String namespaceURI;
    private String localName;
    
    public QName(String ln){
        this.localName = ln;
        namespaceURI = new String();
    }
}

This si indeed a possibility, but in many cases you might need more, like, for instance, to actually pass a namespaceURI to a constructor, or even a prefix. So you can overload the constructor. Like this:

class QName{
    private String namespaceURI;
    private String localName;
    private String prefix;
    
    public QName(String ln){
        this.localName = ln;
        namespaceURI = new String();
        prefix = new String();
    }

    public QName(String ln, String nu){
         this.localName = ln;
        namespaceURI = nu;
        prefix = new String();
    }

    public QName(String ln, String nu, String px){
        .....
    }
}
This way the experienced users can use what suits them best.

You can also take a look at this:
http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/namespace/QName.html

Chances are you have already a QName class at your disposal and you don't have to design any constructors.

Greetings,
Radu

2006/11/9, Frans Englich <frans.englich@telia.com>:

On Thursday 09 November 2006 13:32, Richard Salz wrote:
> Why not just
>         QName(String lname)
>         QName(String nspfx, String lname)

How is that different from:

        QName(String lname, String namespace = String())

except for the order of the arguments?


Cheers,

                Frans

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