io.druid.query.extraction

Class NamespacedExtractor

java.lang.Object

io.druid.query.extraction.NamespacedExtractor

All Implemented Interfaces:

LookupExtractor

public class NamespacedExtractor
extends Object
implements LookupExtractor

Namespaced extraction is a special case of DimExtractionFn where the actual extractor is pulled from a map of known implementations. In the event that an unknown namespace is passed, a simple reflective function is returned instead.

Constructor Summary

Constructors

Constructor and Description
NamespacedExtractor(com.google.common.base.Function<String,com.google.common.base.Function<String,String>> namespaces, String namespace)

Method Summary

Methods

Modifier and Type	Method and Description
String	apply(String value) Apply a particular lookup methodology to the input string
byte[]	getCacheKey() Create a cache key for use in results caching
String	getNamespace()

Methods inherited from class java.lang.Object

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

Constructor Detail

NamespacedExtractor

public NamespacedExtractor(@NotNull
                   com.google.common.base.Function<String,com.google.common.base.Function<String,String>> namespaces,
                   @NotNull
                   String namespace)

Method Detail

getNamespace

public String getNamespace()

getCacheKey

public byte[] getCacheKey()

Description copied from interface: LookupExtractor

Create a cache key for use in results caching

Specified by:

getCacheKey in interface LookupExtractor

Returns:

A byte array that can be used to uniquely identify if results of a prior lookup can use the cached values

apply

public String apply(String value)

Description copied from interface: LookupExtractor

Apply a particular lookup methodology to the input string

Specified by:

apply in interface LookupExtractor

Parameters:

value - The value to apply the lookup to. May not be null

Returns:

The lookup, or null key cannot have the lookup applied to it and should be treated as missing.