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The official Docusign eSignature JAVA client is based on version 2.1 of the Docusign REST API and provides libraries for JAVA application integration. It is recommended that you use this version of the library for new development.

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package com.docusign.esign.client;

import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.databind.*;
import jakarta.ws.rs.ext.ContextResolver;
import java.text.DateFormat;

/** JSON Class. */
public class JSON implements ContextResolver {
  private ObjectMapper mapper;

  /** JSON Class constructor doc. */
  public JSON() {
    mapper = new ObjectMapper();
    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    mapper.configure(DeserializationFeature.FAIL_ON_INVALID_SUBTYPE, false);
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    mapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
    mapper.enable(DeserializationFeature.READ_ENUMS_USING_TO_STRING);
    mapper.setDateFormat(new RFC3339DateFormat());
  }

  /**
   * Returns the current object mapper used for JSON serialization/deserialization.
   *
   * Note: If you make changes to the object mapper, remember to set it back via 
   * setObjectMapper in order to trigger HTTP client rebuilding.
   *
   * @return Object mapper
   */
  public ObjectMapper getObjectMapper() {
    return mapper;
  }

  public JSON setObjectMapper(ObjectMapper mapper) {
    this.mapper = mapper;
    return this;
  }

  /**
   * Set the date format for JSON (de)serialization with Date properties.
   *
   * @param dateFormat Date format
   */
  public void setDateFormat(DateFormat dateFormat) {
    mapper.setDateFormat(dateFormat);
  }

  @Override
  public ObjectMapper getContext(Class type) {
    return mapper;
  }
}