com.northconcepts.datapipeline.transform.lookup

Class Lookup

java.lang.Object

com.northconcepts.datapipeline.transform.lookup.Lookup

Direct Known Subclasses:

BasicLookup, DataReaderLookup, JdbcLookup, ProxyLookup, RecordListLookup

public abstract class Lookup
extends Object

Searches for data in another source to merge with each record passing through this lookup's transformer -- the streaming version of a join.

Constructor Summary

Constructors

Constructor and Description
Lookup()

Method Summary

Modifier and Type	Method and Description
protected void	close()
RecordList	get(List<?> keys)
abstract RecordList	get(Object... keys) Returns the records that match the supplied composite lookup key.
protected void	open()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Lookup

public Lookup()

Method Detail

open

protected void open()

close

protected void close()

get

public abstract RecordList get(Object... keys)

Returns the records that match the supplied composite lookup key.

Contract for subclasses (see also docs/authoring/Lookup.md):

• Called once per source record by LookupTransformer; keep it fast.
• Return an empty RecordList when no match is found. null is also tolerated by LookupTransformer for backward compatibility, but new code should prefer an empty list for clearer semantics.
• Do not mutate the supplied keys; they are owned by the caller.

get

public RecordList get(List<?> keys)