com.yahoo.bard.webservice.druid.serializers

Class SerializerUtil

java.lang.Object

com.yahoo.bard.webservice.druid.serializers.SerializerUtil

public class SerializerUtil
extends Object

Utility functions for druid serializers.

Constructor Summary

Constructors

Constructor and Description
SerializerUtil()

Method Summary

Modifier and Type	Method and Description
static Optional<String>	findPhysicalName(Dimension value, com.fasterxml.jackson.core.JsonGenerator gen) JSON tree walk up to physical table to retrieve physical name for a dimension.
static Boolean	hasInnerQuery(com.fasterxml.jackson.core.JsonGenerator gen) JSON tree walk to determine if there is a nested query below the current json node or not.
static <T> Optional<T>	mapNearestDruidQuery(com.fasterxml.jackson.core.JsonGenerator gen, Function<DruidQuery,T> mapper) JSON tree walk to find the druid query context of the current context and apply handler to the DruidQuery, finds the current context if current context is a druid query.

Methods inherited from class java.lang.Object

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

Constructor Detail

SerializerUtil

public SerializerUtil()

Method Detail

findPhysicalName

public static Optional<String> findPhysicalName(Dimension value,
                                                com.fasterxml.jackson.core.JsonGenerator gen)

JSON tree walk up to physical table to retrieve physical name for a dimension.

Parameters:

value - the dimension to retrieve api name.

gen - the Json Generator to retrieve the tree to walk on.

Returns:

an Optional String of physical name

hasInnerQuery

public static Boolean hasInnerQuery(com.fasterxml.jackson.core.JsonGenerator gen)

JSON tree walk to determine if there is a nested query below the current json node or not.

Parameters:

gen - the Json Generator to retrieve the tree to walk on.

Returns:

a Boolean where true indicates there are more nested query below this node, false otherwise

mapNearestDruidQuery

public static <T> Optional<T> mapNearestDruidQuery(com.fasterxml.jackson.core.JsonGenerator gen,
                                                   Function<DruidQuery,T> mapper)

JSON tree walk to find the druid query context of the current context and apply handler to the DruidQuery, finds the current context if current context is a druid query.

Type Parameters:

T - Type of result from the mapper

Parameters:

gen - the Json Generator to retrieve the tree to walk on.

mapper - a function that takes an DruidQuery as an argument and return the final desired returned result.

Returns:

an Optional of the desired result T if DruidQuery is found, Optional.empty otherwise