hi
I hope to get some ideas how to implement the following:
Let's say I have a class Foo that can contain several Bar instances. The Bar instances are accessed by a key, let's say a Language object. So I have the following methods in Foo:
public Bar getBar(Language l); public Set getLanguages();
In the model of my application I don't want to have an absolute ordering of Bar objects, that is I don't want to expose a method like
public Bar getBar(int index);
or similar. My idea is to have an external object impose an ordering on the Bar objects (that is an ordering on languages). The point is, that the ordering may change at runtime. What that basically means is, that I'll have a mapping from a int key to a Language. For example the mapping would contain:
Language int key de 0 fr 1 en 2
So my idea is to create a custom NodePointer that receives such a mapping definition (so it knows about the ordering of languages). The following xpath expression (with the above mapping definition) should return the text with language fr:
foo/bar[2]
This should be translated (by the custom NodePointer) to a call to:
int index = ...; Foo foo = ...; List mapping = ...; Language lang = (Language)mapping.get(index); Bar fr_bar = foo.getBar(lang);
The following xpath
foo/bar
should probably be converted to something like
List list = foo.getBar();
I'm still unconfident about the jxpath internals, so could please somebody give me some pointers how I could achieve that? I'm I on the right tracks? Which methods from NodePointer class must I override (except the abstract ones, of course)? Is there a simple example that shows how to implement a NodePointer for objects without using any reflection, introspection, ...? Is there anything else I should consider? Please ask me if I missed some important information!
best regards Simon
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