/**
* @todo pico components can have theoretically more then one constructor which is rather stupid
* idea
*/
public Object newInstance(
ComponentDescriptor componentDescriptor, ClassRealm classRealm, PlexusContainer container)
throws ComponentInstantiationException {
try {
String implementation = componentDescriptor.getImplementation();
Class implementationClass = classRealm.loadClass(implementation);
Constructor constructor = implementationClass.getConstructors()[0];
Class[] parameterTypes = constructor.getParameterTypes();
Object[] params = new Object[parameterTypes.length];
for (int i = 0; i < parameterTypes.length; i++) {
Class parameterType = parameterTypes[i];
params[i] = lookupComponent(parameterType, componentDescriptor, container);
}
Object retValue = constructor.newInstance(params);
return retValue;
} catch (Exception e) {
String msg =
"Component " + componentDescriptor.getHumanReadableKey() + " cannot be instantiated";
throw new ComponentInstantiationException(msg, e);
}
}
private ComponentInstantiationException makeException(
ClassRealm componentClassRealm,
ComponentDescriptor componentDescriptor,
Class implementationClass,
Throwable e) {
// ----------------------------------------------------------------------
// Display the realm when there is an error, We should probably return a string here so we
// can incorporate this into the error message for easy debugging.
// ----------------------------------------------------------------------
componentClassRealm.display();
String msg = "Could not instanciate component: " + componentDescriptor.getHumanReadableKey();
return new ComponentInstantiationException(msg, e);
}
private void processCoreComponentConfiguration(
String role, BasicComponentConfigurator configurator, PlexusConfiguration c)
throws ComponentConfigurationException {
String implementation = c.getAttribute("implementation", null);
if (implementation == null) {
String msg =
"Core component: '"
+ role
+ "' + which is needed by plexus to function properly cannot "
+ "be instantiated. Implementation attribute was not specified in plexus.conf."
+ "This is highly irregular, your plexus JAR is most likely corrupt.";
throw new ComponentConfigurationException(msg);
}
ComponentDescriptor componentDescriptor = new ComponentDescriptor();
componentDescriptor.setRole(role);
componentDescriptor.setImplementation(implementation);
PlexusConfiguration configuration = new XmlPlexusConfiguration("configuration");
configuration.addChild(c);
try {
configurator.configureComponent(this, configuration, plexusRealm);
} catch (ComponentConfigurationException e) {
// TODO: don't like rewrapping the same exception, but better than polluting this all through
// the config code
String message = "Error configuring component: " + componentDescriptor.getHumanReadableKey();
throw new ComponentConfigurationException(message, e);
}
}