https://github.com/FasterXML/jackson-core: Core Jackson processing abstractions (aka Streaming API), implementation for JSON (FasterXML)
  • Tatu Saloranta
  • Christopher Currie
  • Paul Brown 
Base classes used by concrete Parser and Generator implementations; contain functionality that is not specific to JSON or input abstraction (byte vs char). Most formats extend these types, although it is also possible to directly extend JsonParser or JsonGenerator. 
/**
 * Base classes used by concrete Parser and Generator implementations;
 * contain functionality that is not specific to JSON or input
 * abstraction (byte vs char).
 * Most formats extend these types, although it is also possible to
 * directly extend {@link com.fasterxml.jackson.core.JsonParser} or
 * {@link com.fasterxml.jackson.core.JsonGenerator}.
 */
package com.fasterxml.jackson.core.base;