/**
* Checks if a FlowFile is known in this session.
*
* @param flowFile the FlowFile to check
* @return <code>true</code> if the FlowFile is known in this session, <code>false</code>
* otherwise.
*/
boolean isFlowFileKnown(final FlowFile flowFile) {
final FlowFile curFlowFile = currentVersions.get(flowFile.getId());
if (curFlowFile == null) {
return false;
}
final String curUuid = curFlowFile.getAttribute(CoreAttributes.UUID.key());
final String providedUuid = curFlowFile.getAttribute(CoreAttributes.UUID.key());
if (!curUuid.equals(providedUuid)) {
return false;
}
return true;
}
/**
* Inherits the attributes from the given source flow files into the destination flow file. The
* UUIDs of the sources becomes the parent UUIDs of the destination flow file. Only attributes
* which is common to all source items is copied into this flow files attributes. Any previously
* established parent UUIDs will be replaced by the UUIDs of the sources. It will capture the uuid
* of a certain number of source objects and may not capture all of them. How many it will capture
* is unspecified.
*
* @param sources to inherit common attributes from
*/
private FlowFile inheritAttributes(
final Collection<FlowFile> sources, final FlowFile destination) {
final StringBuilder parentUuidBuilder = new StringBuilder();
int uuidsCaptured = 0;
for (final FlowFile source : sources) {
if (source == destination) {
continue; // don't want to capture parent uuid of this. Something can't be a child of
// itself
}
final String sourceUuid = source.getAttribute(CoreAttributes.UUID.key());
if (sourceUuid != null && !sourceUuid.trim().isEmpty()) {
uuidsCaptured++;
if (parentUuidBuilder.length() > 0) {
parentUuidBuilder.append(",");
}
parentUuidBuilder.append(sourceUuid);
}
if (uuidsCaptured > 100) {
break;
}
}
final FlowFile updated = putAllAttributes(destination, intersectAttributes(sources));
getProvenanceReporter().join(sources, updated);
return updated;
}
@Override
public String toString() {
final ToStringBuilder builder = new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE);
builder.append("uuid", getAttribute(CoreAttributes.UUID.key()));
builder.append("claim", claim == null ? "" : claim.toString());
builder.append("offset", claimOffset);
builder.append("name", getAttribute(CoreAttributes.FILENAME.key())).append("size", size);
return builder.toString();
}
