public ProcessingStep create(
IProvisioningAgent agent, IProcessingStepDescriptor descriptor, IArtifactDescriptor context) {
IExtensionRegistry registry = RegistryFactory.getRegistry();
IExtension extension =
registry.getExtension(PROCESSING_STEPS_EXTENSION_ID, descriptor.getProcessorId());
Exception error;
if (extension != null) {
IConfigurationElement[] config = extension.getConfigurationElements();
try {
Object object = config[0].createExecutableExtension("class"); // $NON-NLS-1$
ProcessingStep step = (ProcessingStep) object;
step.initialize(agent, descriptor, context);
return step;
} catch (Exception e) {
error = e;
}
} else
error =
new ProcessingStepHandlerException(
NLS.bind(
Messages.cannot_get_extension,
PROCESSING_STEPS_EXTENSION_ID,
descriptor.getProcessorId()));
int severity = descriptor.isRequired() ? IStatus.ERROR : IStatus.INFO;
ProcessingStep result = new EmptyProcessingStep();
result.setStatus(
new Status(
severity,
Activator.ID,
Messages.cannot_instantiate_step + descriptor.getProcessorId(),
error));
return result;
}
public OutputStream link(ProcessingStep[] steps, OutputStream output, IProgressMonitor monitor) {
OutputStream previous = output;
for (int i = steps.length - 1; i >= 0; i--) {
ProcessingStep step = steps[i];
step.link(previous, monitor);
previous = step;
}
if (steps.length == 0) return previous;
// now link the artifact stream to the first stream in the new chain
ArtifactOutputStream lastLink = getArtifactStream(previous);
if (lastLink != null) lastLink.setFirstLink(previous);
return previous;
}