Package org.apache.druid.java.util.emitter.core

Class EventMap

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<String,Object>

org.apache.druid.java.util.emitter.core.EventMap

All Implemented Interfaces:

Serializable, Cloneable, Map<String,Object>

public class EventMap
extends LinkedHashMap<String,Object>

EventMap is a linked hash map implementation where the insertion order of key-value pairs is maintained. It can be safely serialized to JSON using Jackson serializer as it respects the polymorphic annotations on entires (unlike standard Map). The example of polymorphic class is a query interface, where different native query types are resolved by additional field called "queryType". This implementation ensures that the annotation on the values are respected during serialization.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	EventMap.Builder

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
EventMap()

Method Summary

Modifier and Type	Method	Description
EventMap.Builder	asBuilder()	Convert this EventMap to a builder.
static EventMap.Builder	builder()	Returns builder with Fluent API to build EventMap instance using method chaining

Methods inherited from class java.util.LinkedHashMap

clear, containsValue, entrySet, forEach, get, getOrDefault, keySet, removeEldestEntry, replaceAll, values

Methods inherited from class java.util.HashMap

clone, compute, computeIfAbsent, computeIfPresent, containsKey, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, containsKey, equals, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Constructor Details

EventMap

public EventMap()

Method Details

builder

public static EventMap.Builder builder()

Returns builder with Fluent API to build EventMap instance using method chaining

asBuilder

public EventMap.Builder asBuilder()

Convert this EventMap to a builder. Performs copy of the whole EventMap.