Re: Implemeting an ExtensionHeader (was: Why are the header classes final?)

OK, so I apologize for my ignorance of Java, but I'm hoping you guys
will be willing to bear with me a little bit longer.  I thought about
what you said about just working with the interfaces, and thought maybe I
could create my own Header class that does what I want.  So I did that:
created a class that implements ExtensionHeader.  But when I pass that
in as a header (using addHeader), I get that ClassCastException you were
worried about earlier.

So how is one actually supposed to implement an ExtensionHeader?
I'm imagining there is some basic Java trick that I am missing here....

(Obviously I just did some stub stuff here pending showing that
this is actually going to work)

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package stp;

import javax.sip.header.ExtensionHeader;

public class AsterixTransferHeader implements ExtensionHeader {

     private String uri;

     public AsterixTransferHeader() {}

     public AsterixTransferHeader(String uri) { this.uri = uri; }

     public String getName() { return "Contact"; }

     public String getValue() { return "Transfer <" + uri + ">"; }

     public void setValue(String uri) { this.uri = uri; }

     public Object clone() { System.out.println("AsterixTransferHeader.clone called"); return new AsterixTransferHeader(this.uri);}

     public boolean equals(Object obj) { System.out.println("AsterixTransferHeader.equals called"); return false;}

     public int hashCode() { System.out.println("AsterixTransferHeader.hashCode called"); return super.hashCode();}

     public String toString() { return this.getName() + ": " + this.getValue(); }

};

--David