co.cask.cdap.etl.api

Interface Lookup<T>

Type Parameters:

T - the type of object that will be returned for a lookup

All Known Implementing Classes:

KeyValueTableLookup

public interface Lookup<T>

Exposes read-only lookup operations on datasets.

Method Summary

Methods

Modifier and Type	Method and Description
Map<String,T>	lookup(Set<String> keys) Performs a batch lookup.
Map<String,T>	lookup(String... keys) Performs a batch lookup.
T	lookup(String key) Performs a single lookup.

Method Detail

lookup

T lookup(String key)

Performs a single lookup.

Parameters:

key - the key to lookup

Returns:

the value associated with the key

lookup

Map<String,T> lookup(String... keys)

Performs a batch lookup.

Parameters:

keys - the keys to lookup

Returns:

a map from key to value

lookup

Map<String,T> lookup(Set<String> keys)

Performs a batch lookup.

Parameters:

keys - the keys to lookup

Returns:

a map from key to value