/**
* Add an adaptor for a kind of object so ST knows how to pull properties from them. Add adaptors
* in increasing order of specificity. ST adds Object, Map, and ST model adaptors for you first.
* Adaptors you add have priority over default adaptors.
*
* <p>If an adaptor for type T already exists, it is replaced by the adaptor arg.
*
* <p>This must invalidate cache entries, so set your adaptors up before render()ing your
* templates for efficiency.
*/
public void registerModelAdaptor(Class attributeType, ModelAdaptor adaptor) {
if (attributeType.isPrimitive()) {
throw new IllegalArgumentException(
"can't register ModelAdaptor for primitive type " + attributeType.getSimpleName());
}
adaptors.put(attributeType, adaptor);
invalidateModelAdaptorCache(attributeType);
}
/**
* Register a renderer for all objects of a particular "kind" for all templates evaluated relative
* to this group. Use r to render if object in question is instanceof(attributeType).
*/
public void registerRenderer(Class attributeType, AttributeRenderer r) {
if (attributeType.isPrimitive()) {
throw new IllegalArgumentException(
"can't register renderer for primitive type " + attributeType.getSimpleName());
}
typeToAdaptorCache.clear(); // be safe, not clever; wack all values
if (renderers == null) {
renderers = Collections.synchronizedMap(new LinkedHashMap<Class, AttributeRenderer>());
}
renderers.put(attributeType, r);
}
public ModelAdaptor getModelAdaptor(Class attributeType) {
ModelAdaptor a = typeToAdaptorCache.get(attributeType);
if (a != null) return a;
// System.out.println("looking for adaptor for "+attributeType);
// Else, we must find adaptor that fits;
// find last fit (most specific)
for (Class t : adaptors.keySet()) {
// t works for attributeType if attributeType subclasses t or implements
// System.out.println("checking "+t.getSimpleName()+" against "+attributeType);
if (t.isAssignableFrom(attributeType)) {
// System.out.println(t.getName()+" = "+attributeType.getName());
a = adaptors.get(t);
}
}
// System.out.println("adaptor for "+attributeType+" is "+a);
typeToAdaptorCache.put(attributeType, a); // cache it for next time
return a;
}
public AttributeRenderer getAttributeRenderer(Class attributeType) {
if (renderers == null) return null;
AttributeRenderer r = null;
if (typeToRendererCache != null) {
r = typeToRendererCache.get(attributeType);
if (r != null) return r;
}
// Else look up, finding first first
for (Class t : renderers.keySet()) {
// t works for attributeType if attributeType subclasses t or implements
if (t.isAssignableFrom(attributeType)) {
r = renderers.get(t);
if (typeToRendererCache == null) {
typeToRendererCache =
Collections.synchronizedMap(new LinkedHashMap<Class, AttributeRenderer>());
}
typeToRendererCache.put(attributeType, r);
return r;
}
}
return null;
}
