[stringtemplate-interest] v4 renderers

[Terence Parr]

ok, v4 works for renderers now with instanceof functionality:

	@Test public void testInstanceofRenderer() throws Exception {
		String templates =
				"numberThing(x,y,z) ::= \"numbers: <x>, <y>; <z>\"\n";
		writeFile(tmpdir, "t.stg", templates);
		STGroup group = new STGroupFile(tmpdir+"/t.stg");
		group.registerRenderer(Number.class, new NumberRenderer());
		ST st = group.getInstanceOf("numberThing");
		st.add("x", -2100);
		st.add("y", 3.14159);
		st.add("z", "hi"); 
		String expecting = "numbers: -2100, 3.14159; hi";
		String result = st.render();
		assertEquals(expecting, result);
	}

Note that Integer and Double are subclasses of Number.

Look up for each attribute ref is hyperslow at the moment (checks attributeType against all renderers):

	public AttributeRenderer getAttributeRenderer(Class attributeType) {
		if ( renderers==null ) return null;
		// TODO: cache this lookup
		for (Class t : renderers.keySet()) {
			// t works for attributeType if attributeType subclasses t or implements
			if ( t.isAssignableFrom(attributeType) ) return renderers.get(t);
		}
		return null;
	}

Look ok?  Same would work for registerModelAdaptor(type, adap), right?  Upon <a.p> and a.getClass() is instanceof or implements type, then I'd ask adap how to get p from 'a', right?  Later I can cache a.getClass -> adap mapping.

Latest is here, updated hourly: (the ant build should work)

http://www.stringtemplate.org/depot/ST4/java/main

Ter
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