[jdom-interest] API Inertia
Joseph Bowbeer
jozart at csi.com
Wed May 2 03:25:26 PDT 2001
PS - Here's an attempt to show a simple Visitor example:
For example, the XPath getValue method for Attribute, Element, etc.
could be implemented using a XPathValueVisitor.
This would require that every object in a document implement Visitable.
interface Visitable {
void accept(Visitor visitor);
}
The XPathValueVisitor computes the value appropriate for the particular
visitable instance:
class XPathValueVisitor extends Visitor {
Object value;
void visitElement(Element element) {
value = element.whatever();
}
void visitAttribute(Attribute attribute) {
value = attribute.whatever();
}
// ...etc...
}
The XPath value would be retrieved as follows:
Object getValue(Visitable node) {
XPathValueVisitor visitor = new XPathValueVisitor();
node.accept(visitor);
return visitor.value;
}
--
Joe Bowbeer
More information about the jdom-interest
mailing list