com.northconcepts.datapipeline.transform.lookup

Class DataReaderLookup

java.lang.Object

com.northconcepts.datapipeline.transform.lookup.Lookup

com.northconcepts.datapipeline.transform.lookup.DataReaderLookup

public class DataReaderLookup
extends Lookup

Constructor Summary

Constructors

Constructor and Description
DataReaderLookup(DataReader reader, FieldList parameterFields) Add all result fields.
DataReaderLookup(DataReader reader, FieldList parameterFields, FieldList resultFields) Adds selected result fields.

Method Summary

Modifier and Type	Method and Description
RecordList	get(Object... keys) Returns the records that match the supplied composite lookup key.
String	toString()

Methods inherited from class com.northconcepts.datapipeline.transform.lookup.Lookup

close, get, open

Methods inherited from class java.lang.Object

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

Constructor Detail

DataReaderLookup

public DataReaderLookup(DataReader reader,
                        FieldList parameterFields)

Add all result fields.

Parameters:

reader -

parameterFields -

DataReaderLookup

public DataReaderLookup(DataReader reader,
                        FieldList parameterFields,
                        FieldList resultFields)

Adds selected result fields.

Parameters:

reader -

parameterFields -

resultFields -

Method Detail

get

public RecordList get(Object... keys)

Description copied from class: Lookup

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.

Specified by:

get in class Lookup

toString

public String toString()

Overrides:

toString in class Object