/** This one is for the spout */
@SuppressWarnings("unchecked")
public static Fields registerMetaParticleFieldsFromMetaParticleClass(
Config conf, Class<? extends MetaParticle> metaParticleClass) {
Fields metaParticleFields = null;
if (conf.containsKey(METADATA_FIELDS)) {
metaParticleFields = new Fields((List<String>) conf.get(METADATA_FIELDS));
}
Fields fields =
ParticleMapper.mergeFields(metaParticleFields, ParticleMapper.getFields(metaParticleClass));
conf.put(METADATA_FIELDS, fields.toList());
return fields;
}
public static Fields getMetaParticleOutputFieldsFromOperationClass(
Class<? extends Operation> operationClass) {
List<Class<? extends MetaParticle>> outputMetaParticles =
OperationManager.getOutputMetaParticles(operationClass);
Fields fields = null;
for (Class<? extends MetaParticle> p : outputMetaParticles) {
Fields newfields = ParticleMapper.getFields(p);
if (fields == null) {
fields = newfields;
} else {
fields = ParticleMapper.mergeFields(fields, newfields);
}
}
return fields;
}