@Override
public FlowSnippetDTO instantiateTemplate(
String groupId, Double originX, Double originY, String templateId) {
ProcessGroup group = locateProcessGroup(flowController, groupId);
// get the template id and find the template
Template template = flowController.getTemplate(templateId);
// ensure the template could be found
if (template == null) {
throw new ResourceNotFoundException(
String.format("Unable to locate template with id '%s'.", templateId));
}
try {
// copy the template which pre-processes all ids
TemplateDTO templateDetails = template.getDetails();
FlowSnippetDTO snippet = snippetUtils.copy(templateDetails.getSnippet(), group);
// reposition the template contents
org.apache.nifi.util.SnippetUtils.moveSnippet(snippet, originX, originY);
// instantiate the template into this group
flowController.instantiateSnippet(group, snippet);
return snippet;
} catch (ProcessorInstantiationException pie) {
throw new NiFiCoreException(
String.format(
"Unable to instantiate template because processor type '%s' is unknown to this NiFi.",
StringUtils.substringAfterLast(pie.getMessage(), ".")));
}
}
@Override
public FlowSnippetDTO instantiateTemplate(
String groupId, Double originX, Double originY, String templateId, String idGenerationSeed) {
ProcessGroup group = locateProcessGroup(flowController, groupId);
// get the template id and find the template
Template template = getTemplate(templateId);
// ensure the template could be found
if (template == null) {
throw new ResourceNotFoundException(
String.format("Unable to locate template with id '%s'.", templateId));
}
try {
// copy the template which pre-processes all ids
TemplateDTO templateDetails = template.getDetails();
FlowSnippetDTO snippet =
snippetUtils.copy(templateDetails.getSnippet(), group, idGenerationSeed);
// calculate scaling factors based on the template encoding version
// attempt to parse the encoding version
final FlowEncodingVersion templateEncodingVersion =
FlowEncodingVersion.parse(templateDetails.getEncodingVersion());
// get the major version, or 0 if no version could be parsed
int templateEncodingMajorVersion =
templateEncodingVersion != null ? templateEncodingVersion.getMajorVersion() : 0;
// based on the major version < 1, use the default scaling factors. Otherwise, don't scale
// (use factor of 1.0)
double factorX =
templateEncodingMajorVersion < 1 ? FlowController.DEFAULT_POSITION_SCALE_FACTOR_X : 1.0;
double factorY =
templateEncodingMajorVersion < 1 ? FlowController.DEFAULT_POSITION_SCALE_FACTOR_Y : 1.0;
// reposition and scale the template contents
org.apache.nifi.util.SnippetUtils.moveAndScaleSnippet(
snippet, originX, originY, factorX, factorY);
// find all the child process groups in each process group in the top level of this snippet
final List<ProcessGroupDTO> childProcessGroups =
org.apache.nifi.util.SnippetUtils.findAllProcessGroups(snippet);
// scale (but don't reposition) child process groups
childProcessGroups
.stream()
.forEach(
processGroup ->
org.apache.nifi.util.SnippetUtils.scaleSnippet(
processGroup.getContents(), factorX, factorY));
// instantiate the template into this group
flowController.instantiateSnippet(group, snippet);
return snippet;
} catch (ProcessorInstantiationException pie) {
throw new NiFiCoreException(
String.format(
"Unable to instantiate template because processor type '%s' is unknown to this NiFi.",
StringUtils.substringAfterLast(pie.getMessage(), ".")));
}
}