private Configurable getComponentFromAnnotation(String name, S4Component s4Component) {
Configurable configurable;
Class<? extends Configurable> defClass = s4Component.defaultClass();
if (defClass.equals(Configurable.class) && s4Component.mandatory()) {
throw new InternalConfigurationException(
getInstanceName(), name, "mandatory property is not set!");
}
if (Modifier.isAbstract(defClass.getModifiers()) && s4Component.mandatory())
throw new InternalConfigurationException(
getInstanceName(), name, defClass.getName() + " is abstract!");
// because we're forced to use the default type, make sure that it
// is set
if (defClass.equals(Configurable.class)) {
if (s4Component.mandatory()) {
throw new InternalConfigurationException(
getInstanceName(), name, instanceName + ": no default class defined for " + name);
} else {
return null;
}
}
configurable = ConfigurationManager.getInstance(defClass);
if (configurable == null) {
throw new InternalConfigurationException(
getInstanceName(), name, "instantiation of referenenced configurable failed");
}
return configurable;
}
/**
* Returns the class of of a registered component property without instantiating it.
*
* @param propName the name of the property
* @return class of the component corresponding to that property
*/
public Class<? extends Configurable> getComponentClass(String propName) {
Class<? extends Configurable> defClass = null;
if (propValues.get(propName) != null)
try {
Class<?> objClass = Class.forName((String) propValues.get(propName));
defClass = objClass.asSubclass(Configurable.class);
} catch (ClassNotFoundException e) {
PropertySheet ps = cm.getPropertySheet(flattenProp(propName));
defClass = ps.ownerClass;
}
else {
S4Component comAnno = (S4Component) registeredProperties.get(propName).getAnnotation();
defClass = comAnno.defaultClass();
if (comAnno.mandatory()) defClass = null;
}
return defClass;
}