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/*
 * Zuora API Reference
 * REST API reference for the Zuora Billing, Payments, and Central Platform! Check out the [REST API Overview](https://www.zuora.com/developer/api-references/api/overview/).
 *
 * The version of the OpenAPI document: 2024-05-20
 * Contact: [email protected]
 *
 * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
 * https://openapi-generator.tech
 * Do not edit the class manually.
 */


package com.zuora.model;

import java.util.Objects;
import com.google.gson.TypeAdapter;
import com.google.gson.annotations.JsonAdapter;
import com.google.gson.annotations.SerializedName;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.Arrays;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import com.zuora.JSON;

/**
 * UsageItem
 */
@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen", comments = "Generator version: 7.6.0")
public class UsageItem {
  public static final String SERIALIZED_NAME_ID = "id";
  @SerializedName(SERIALIZED_NAME_ID)
  private String id;

  public static final String SERIALIZED_NAME_ACCOUNT_ID = "accountId";
  @SerializedName(SERIALIZED_NAME_ACCOUNT_ID)
  private String accountId;

  public static final String SERIALIZED_NAME_ACCOUNT_NAME = "accountName";
  @SerializedName(SERIALIZED_NAME_ACCOUNT_NAME)
  private String accountName;

  public static final String SERIALIZED_NAME_ACCOUNT_NUMBER = "accountNumber";
  @SerializedName(SERIALIZED_NAME_ACCOUNT_NUMBER)
  private String accountNumber;

  public static final String SERIALIZED_NAME_PRODUCT_RATE_PLAN_CHARGE_NUMBER = "productRatePlanChargeNumber";
  @SerializedName(SERIALIZED_NAME_PRODUCT_RATE_PLAN_CHARGE_NUMBER)
  private String productRatePlanChargeNumber;

  public static final String SERIALIZED_NAME_SUBSCRIPTION_NUMBER = "subscriptionNumber";
  @SerializedName(SERIALIZED_NAME_SUBSCRIPTION_NUMBER)
  private String subscriptionNumber;

  public static final String SERIALIZED_NAME_CHARGE_NUMBER = "chargeNumber";
  @SerializedName(SERIALIZED_NAME_CHARGE_NUMBER)
  private String chargeNumber;

  public static final String SERIALIZED_NAME_START_DATE_TIME = "startDateTime";
  @SerializedName(SERIALIZED_NAME_START_DATE_TIME)
  private String startDateTime;

  public static final String SERIALIZED_NAME_UNIT_OF_MEASURE = "unitOfMeasure";
  @SerializedName(SERIALIZED_NAME_UNIT_OF_MEASURE)
  private String unitOfMeasure;

  public static final String SERIALIZED_NAME_QUANTITY = "quantity";
  @SerializedName(SERIALIZED_NAME_QUANTITY)
  private BigDecimal quantity;

  public static final String SERIALIZED_NAME_SOURCE_NAME = "sourceName";
  @SerializedName(SERIALIZED_NAME_SOURCE_NAME)
  private String sourceName;

  public static final String SERIALIZED_NAME_FILE_NAME = "fileName";
  @SerializedName(SERIALIZED_NAME_FILE_NAME)
  private String fileName;

  public static final String SERIALIZED_NAME_STATUS = "status";
  @SerializedName(SERIALIZED_NAME_STATUS)
  private String status;

  public static final String SERIALIZED_NAME_SUBMISSION_DATE_TIME = "submissionDateTime";
  @SerializedName(SERIALIZED_NAME_SUBMISSION_DATE_TIME)
  private String submissionDateTime;

  public static final String SERIALIZED_NAME_UNIQUE_KEY = "uniqueKey";
  @SerializedName(SERIALIZED_NAME_UNIQUE_KEY)
  private String uniqueKey;

  public UsageItem() {
  }

  public UsageItem id(String id) {
    this.id = id;
    return this;
  }

  /**
   * Unique ID for the usage item. 
   * @return id
   */
  @javax.annotation.Nullable
  public String getId() {
    return id;
  }

  public void setId(String id) {
    this.id = id;
  }


  public UsageItem accountId(String accountId) {
    this.accountId = accountId;
    return this;
  }

  /**
   * Customer account ID. 
   * @return accountId
   */
  @javax.annotation.Nullable
  public String getAccountId() {
    return accountId;
  }

  public void setAccountId(String accountId) {
    this.accountId = accountId;
  }


  public UsageItem accountName(String accountName) {
    this.accountName = accountName;
    return this;
  }

  /**
   * Customer account name. 
   * @return accountName
   */
  @javax.annotation.Nullable
  public String getAccountName() {
    return accountName;
  }

  public void setAccountName(String accountName) {
    this.accountName = accountName;
  }


  public UsageItem accountNumber(String accountNumber) {
    this.accountNumber = accountNumber;
    return this;
  }

  /**
   * Customer account number. 
   * @return accountNumber
   */
  @javax.annotation.Nullable
  public String getAccountNumber() {
    return accountNumber;
  }

  public void setAccountNumber(String accountNumber) {
    this.accountNumber = accountNumber;
  }


  public UsageItem productRatePlanChargeNumber(String productRatePlanChargeNumber) {
    this.productRatePlanChargeNumber = productRatePlanChargeNumber;
    return this;
  }

  /**
   * Product rate plan charge number. **Note**: This field is only available if you have the [Dynamic Usage Charge] enabled. 
   * @return productRatePlanChargeNumber
   */
  @javax.annotation.Nullable
  public String getProductRatePlanChargeNumber() {
    return productRatePlanChargeNumber;
  }

  public void setProductRatePlanChargeNumber(String productRatePlanChargeNumber) {
    this.productRatePlanChargeNumber = productRatePlanChargeNumber;
  }


  public UsageItem subscriptionNumber(String subscriptionNumber) {
    this.subscriptionNumber = subscriptionNumber;
    return this;
  }

  /**
   * Number of the subscription covering this usage. 
   * @return subscriptionNumber
   */
  @javax.annotation.Nullable
  public String getSubscriptionNumber() {
    return subscriptionNumber;
  }

  public void setSubscriptionNumber(String subscriptionNumber) {
    this.subscriptionNumber = subscriptionNumber;
  }


  public UsageItem chargeNumber(String chargeNumber) {
    this.chargeNumber = chargeNumber;
    return this;
  }

  /**
   * Number of the rate-plan charge that pays for this usage. 
   * @return chargeNumber
   */
  @javax.annotation.Nullable
  public String getChargeNumber() {
    return chargeNumber;
  }

  public void setChargeNumber(String chargeNumber) {
    this.chargeNumber = chargeNumber;
  }


  public UsageItem startDateTime(String startDateTime) {
    this.startDateTime = startDateTime;
    return this;
  }

  /**
   * Start date of the time period in which usage is tracked. Zuora uses this field value to determine the usage date. 
   * @return startDateTime
   */
  @javax.annotation.Nullable
  public String getStartDateTime() {
    return startDateTime;
  }

  public void setStartDateTime(String startDateTime) {
    this.startDateTime = startDateTime;
  }


  public UsageItem unitOfMeasure(String unitOfMeasure) {
    this.unitOfMeasure = unitOfMeasure;
    return this;
  }

  /**
   * Unit used to measure consumption. 
   * @return unitOfMeasure
   */
  @javax.annotation.Nullable
  public String getUnitOfMeasure() {
    return unitOfMeasure;
  }

  public void setUnitOfMeasure(String unitOfMeasure) {
    this.unitOfMeasure = unitOfMeasure;
  }


  public UsageItem quantity(BigDecimal quantity) {
    this.quantity = quantity;
    return this;
  }

  /**
   * Number of units used. 
   * @return quantity
   */
  @javax.annotation.Nullable
  public BigDecimal getQuantity() {
    return quantity;
  }

  public void setQuantity(BigDecimal quantity) {
    this.quantity = quantity;
  }


  public UsageItem sourceName(String sourceName) {
    this.sourceName = sourceName;
    return this;
  }

  /**
   * Source of the usage data. Possible values are: `Import`, `API`. 
   * @return sourceName
   */
  @javax.annotation.Nullable
  public String getSourceName() {
    return sourceName;
  }

  public void setSourceName(String sourceName) {
    this.sourceName = sourceName;
  }


  public UsageItem fileName(String fileName) {
    this.fileName = fileName;
    return this;
  }

  /**
   * The name of the import file when the usage record is imported from the file. 
   * @return fileName
   */
  @javax.annotation.Nullable
  public String getFileName() {
    return fileName;
  }

  public void setFileName(String fileName) {
    this.fileName = fileName;
  }


  public UsageItem status(String status) {
    this.status = status;
    return this;
  }

  /**
   * Possible values are: `Importing`, `Pending`, `Processed`. 
   * @return status
   */
  @javax.annotation.Nullable
  public String getStatus() {
    return status;
  }

  public void setStatus(String status) {
    this.status = status;
  }


  public UsageItem submissionDateTime(String submissionDateTime) {
    this.submissionDateTime = submissionDateTime;
    return this;
  }

  /**
   * Date when usage was submitted. 
   * @return submissionDateTime
   */
  @javax.annotation.Nullable
  public String getSubmissionDateTime() {
    return submissionDateTime;
  }

  public void setSubmissionDateTime(String submissionDateTime) {
    this.submissionDateTime = submissionDateTime;
  }


  public UsageItem uniqueKey(String uniqueKey) {
    this.uniqueKey = uniqueKey;
    return this;
  }

  /**
   * a customer-defined specific identifier of a usage record.  **Note**: This field is only available if you have the [Prepaid with Drawdown](https://knowledgecenter.zuora.com/Billing/Billing_and_Payments/J_Billing_Operations/Prepaid_with_Drawdown) or  [Unbilled Usage](https://knowledgecenter.zuora.com/Zuora_Billing/Bill_your_customers/Bill_for_usage_or_prepaid_products/Advanced_Consumption_Billing/Unbilled_Usage) feature enabled. See [Upload usage record with unique key](https://knowledgecenter.zuora.com/Billing/Billing_and_Payments/J_Billing_Operations/Prepaid_with_Drawdown/Prepaid_balance_transactions#Upload_usage_record_with_unique_key) for more information. 
   * @return uniqueKey
   */
  @javax.annotation.Nullable
  public String getUniqueKey() {
    return uniqueKey;
  }

  public void setUniqueKey(String uniqueKey) {
    this.uniqueKey = uniqueKey;
  }

  /**
   * A container for additional, undeclared properties.
   * This is a holder for any undeclared properties as specified with
   * the 'additionalProperties' keyword in the OAS document.
   */
  private Map additionalProperties;

  /**
   * Set the additional (undeclared) property with the specified name and value.
   * If the property does not already exist, create it otherwise replace it.
   *
   * @param key name of the property
   * @param value value of the property
   * @return the UsageItem instance itself
   */
  public UsageItem putAdditionalProperty(String key, Object value) {
    if (this.additionalProperties == null) {
        this.additionalProperties = new HashMap();
    }
    this.additionalProperties.put(key, value);
    return this;
  }

  /**
   * Return the additional (undeclared) property.
   *
   * @return a map of objects
   */
  public Map getAdditionalProperties() {
    return additionalProperties;
  }

  /**
   * Return the additional (undeclared) property with the specified name.
   *
   * @param key name of the property
   * @return an object
   */
  public Object getAdditionalProperty(String key) {
    if (this.additionalProperties == null) {
        return null;
    }
    return this.additionalProperties.get(key);
  }


  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    UsageItem usageItem = (UsageItem) o;
    return Objects.equals(this.id, usageItem.id) &&
        Objects.equals(this.accountId, usageItem.accountId) &&
        Objects.equals(this.accountName, usageItem.accountName) &&
        Objects.equals(this.accountNumber, usageItem.accountNumber) &&
        Objects.equals(this.productRatePlanChargeNumber, usageItem.productRatePlanChargeNumber) &&
        Objects.equals(this.subscriptionNumber, usageItem.subscriptionNumber) &&
        Objects.equals(this.chargeNumber, usageItem.chargeNumber) &&
        Objects.equals(this.startDateTime, usageItem.startDateTime) &&
        Objects.equals(this.unitOfMeasure, usageItem.unitOfMeasure) &&
        Objects.equals(this.quantity, usageItem.quantity) &&
        Objects.equals(this.sourceName, usageItem.sourceName) &&
        Objects.equals(this.fileName, usageItem.fileName) &&
        Objects.equals(this.status, usageItem.status) &&
        Objects.equals(this.submissionDateTime, usageItem.submissionDateTime) &&
        Objects.equals(this.uniqueKey, usageItem.uniqueKey)&&
        Objects.equals(this.additionalProperties, usageItem.additionalProperties);
  }

  @Override
  public int hashCode() {
    return Objects.hash(id, accountId, accountName, accountNumber, productRatePlanChargeNumber, subscriptionNumber, chargeNumber, startDateTime, unitOfMeasure, quantity, sourceName, fileName, status, submissionDateTime, uniqueKey, additionalProperties);
  }

  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("class UsageItem {\n");
    sb.append("    id: ").append(toIndentedString(id)).append("\n");
    sb.append("    accountId: ").append(toIndentedString(accountId)).append("\n");
    sb.append("    accountName: ").append(toIndentedString(accountName)).append("\n");
    sb.append("    accountNumber: ").append(toIndentedString(accountNumber)).append("\n");
    sb.append("    productRatePlanChargeNumber: ").append(toIndentedString(productRatePlanChargeNumber)).append("\n");
    sb.append("    subscriptionNumber: ").append(toIndentedString(subscriptionNumber)).append("\n");
    sb.append("    chargeNumber: ").append(toIndentedString(chargeNumber)).append("\n");
    sb.append("    startDateTime: ").append(toIndentedString(startDateTime)).append("\n");
    sb.append("    unitOfMeasure: ").append(toIndentedString(unitOfMeasure)).append("\n");
    sb.append("    quantity: ").append(toIndentedString(quantity)).append("\n");
    sb.append("    sourceName: ").append(toIndentedString(sourceName)).append("\n");
    sb.append("    fileName: ").append(toIndentedString(fileName)).append("\n");
    sb.append("    status: ").append(toIndentedString(status)).append("\n");
    sb.append("    submissionDateTime: ").append(toIndentedString(submissionDateTime)).append("\n");
    sb.append("    uniqueKey: ").append(toIndentedString(uniqueKey)).append("\n");
    sb.append("    additionalProperties: ").append(toIndentedString(additionalProperties)).append("\n");
    sb.append("}");
    return sb.toString();
  }

  /**
   * Convert the given object to string with each line indented by 4 spaces
   * (except the first line).
   */
  private String toIndentedString(Object o) {
    if (o == null) {
      return "null";
    }
    return o.toString().replace("\n", "\n    ");
  }


  public static HashSet openapiFields;
  public static HashSet openapiRequiredFields;

  static {
    // a set of all properties/fields (JSON key names)
    openapiFields = new HashSet();
    openapiFields.add("id");
    openapiFields.add("accountId");
    openapiFields.add("accountName");
    openapiFields.add("accountNumber");
    openapiFields.add("productRatePlanChargeNumber");
    openapiFields.add("subscriptionNumber");
    openapiFields.add("chargeNumber");
    openapiFields.add("startDateTime");
    openapiFields.add("unitOfMeasure");
    openapiFields.add("quantity");
    openapiFields.add("sourceName");
    openapiFields.add("fileName");
    openapiFields.add("status");
    openapiFields.add("submissionDateTime");
    openapiFields.add("uniqueKey");

    // a set of required properties/fields (JSON key names)
    openapiRequiredFields = new HashSet();
  }

  /**
   * Validates the JSON Element and throws an exception if issues found
   *
   * @param jsonElement JSON Element
   * @throws IOException if the JSON Element is invalid with respect to UsageItem
   */
  public static void validateJsonElement(JsonElement jsonElement) throws IOException {
      if (jsonElement == null) {
        if (!UsageItem.openapiRequiredFields.isEmpty()) { // has required fields but JSON element is null
          throw new IllegalArgumentException(String.format("The required field(s) %s in UsageItem is not found in the empty JSON string", UsageItem.openapiRequiredFields.toString()));
        }
      }
        JsonObject jsonObj = jsonElement.getAsJsonObject();
      if ((jsonObj.get("id") != null && !jsonObj.get("id").isJsonNull()) && !jsonObj.get("id").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `id` to be a primitive type in the JSON string but got `%s`", jsonObj.get("id").toString()));
      }
      if ((jsonObj.get("accountId") != null && !jsonObj.get("accountId").isJsonNull()) && !jsonObj.get("accountId").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `accountId` to be a primitive type in the JSON string but got `%s`", jsonObj.get("accountId").toString()));
      }
      if ((jsonObj.get("accountName") != null && !jsonObj.get("accountName").isJsonNull()) && !jsonObj.get("accountName").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `accountName` to be a primitive type in the JSON string but got `%s`", jsonObj.get("accountName").toString()));
      }
      if ((jsonObj.get("accountNumber") != null && !jsonObj.get("accountNumber").isJsonNull()) && !jsonObj.get("accountNumber").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `accountNumber` to be a primitive type in the JSON string but got `%s`", jsonObj.get("accountNumber").toString()));
      }
      if ((jsonObj.get("productRatePlanChargeNumber") != null && !jsonObj.get("productRatePlanChargeNumber").isJsonNull()) && !jsonObj.get("productRatePlanChargeNumber").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `productRatePlanChargeNumber` to be a primitive type in the JSON string but got `%s`", jsonObj.get("productRatePlanChargeNumber").toString()));
      }
      if ((jsonObj.get("subscriptionNumber") != null && !jsonObj.get("subscriptionNumber").isJsonNull()) && !jsonObj.get("subscriptionNumber").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `subscriptionNumber` to be a primitive type in the JSON string but got `%s`", jsonObj.get("subscriptionNumber").toString()));
      }
      if ((jsonObj.get("chargeNumber") != null && !jsonObj.get("chargeNumber").isJsonNull()) && !jsonObj.get("chargeNumber").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `chargeNumber` to be a primitive type in the JSON string but got `%s`", jsonObj.get("chargeNumber").toString()));
      }
      if ((jsonObj.get("startDateTime") != null && !jsonObj.get("startDateTime").isJsonNull()) && !jsonObj.get("startDateTime").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `startDateTime` to be a primitive type in the JSON string but got `%s`", jsonObj.get("startDateTime").toString()));
      }
      if ((jsonObj.get("unitOfMeasure") != null && !jsonObj.get("unitOfMeasure").isJsonNull()) && !jsonObj.get("unitOfMeasure").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `unitOfMeasure` to be a primitive type in the JSON string but got `%s`", jsonObj.get("unitOfMeasure").toString()));
      }
      if ((jsonObj.get("quantity") != null && !jsonObj.get("quantity").isJsonNull()) && !jsonObj.get("quantity").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `quantity` to be a primitive type in the JSON string but got `%s`", jsonObj.get("quantity").toString()));
      }
      if ((jsonObj.get("sourceName") != null && !jsonObj.get("sourceName").isJsonNull()) && !jsonObj.get("sourceName").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `sourceName` to be a primitive type in the JSON string but got `%s`", jsonObj.get("sourceName").toString()));
      }
      if ((jsonObj.get("fileName") != null && !jsonObj.get("fileName").isJsonNull()) && !jsonObj.get("fileName").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `fileName` to be a primitive type in the JSON string but got `%s`", jsonObj.get("fileName").toString()));
      }
      if ((jsonObj.get("status") != null && !jsonObj.get("status").isJsonNull()) && !jsonObj.get("status").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `status` to be a primitive type in the JSON string but got `%s`", jsonObj.get("status").toString()));
      }
      if ((jsonObj.get("submissionDateTime") != null && !jsonObj.get("submissionDateTime").isJsonNull()) && !jsonObj.get("submissionDateTime").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `submissionDateTime` to be a primitive type in the JSON string but got `%s`", jsonObj.get("submissionDateTime").toString()));
      }
      if ((jsonObj.get("uniqueKey") != null && !jsonObj.get("uniqueKey").isJsonNull()) && !jsonObj.get("uniqueKey").isJsonPrimitive()) {
        throw new IllegalArgumentException(String.format("Expected the field `uniqueKey` to be a primitive type in the JSON string but got `%s`", jsonObj.get("uniqueKey").toString()));
      }
  }

  public static class CustomTypeAdapterFactory implements TypeAdapterFactory {
    @SuppressWarnings("unchecked")
    @Override
    public  TypeAdapter create(Gson gson, TypeToken type) {
       if (!UsageItem.class.isAssignableFrom(type.getRawType())) {
         return null; // this class only serializes 'UsageItem' and its subtypes
       }
       final TypeAdapter elementAdapter = gson.getAdapter(JsonElement.class);
       final TypeAdapter thisAdapter
                        = gson.getDelegateAdapter(this, TypeToken.get(UsageItem.class));

       return (TypeAdapter) new TypeAdapter() {
           @Override
           public void write(JsonWriter out, UsageItem value) throws IOException {
             JsonObject obj = thisAdapter.toJsonTree(value).getAsJsonObject();
             obj.remove("additionalProperties");

             // support null values
             out.beginObject();
             Iterator iterator = obj.entrySet().iterator();
             while(iterator.hasNext()) {
                 Map.Entry e = (Map.Entry) iterator.next();
                 out.name((String)e.getKey());
                 elementAdapter.write(out, e.getValue());
             }

             // end

             // serialize additional properties
             if (value.getAdditionalProperties() != null) {
               // support null values
               boolean oldSerializeNulls = out.getSerializeNulls();
               out.setSerializeNulls(true); //force serialize
               // end
               for (Map.Entry entry : value.getAdditionalProperties().entrySet()) {
                 if (entry.getValue() instanceof String)
                   obj.addProperty(entry.getKey(), (String) entry.getValue());
                 else if (entry.getValue() instanceof Number)
                   obj.addProperty(entry.getKey(), (Number) entry.getValue());
                 else if (entry.getValue() instanceof Boolean)
                   obj.addProperty(entry.getKey(), (Boolean) entry.getValue());
                 else if (entry.getValue() instanceof Character)
                   obj.addProperty(entry.getKey(), (Character) entry.getValue());
                 else if (entry.getValue() == null)
                    obj.add(entry.getKey(), null);
                 else {
                   JsonElement jsonElement = gson.toJsonTree(entry.getValue());
                   if (jsonElement.isJsonArray()) {
                     obj.add(entry.getKey(), jsonElement.getAsJsonArray());
                   } else {
                     obj.add(entry.getKey(), jsonElement.getAsJsonObject());
                   }
                 }
                 out.name((String)entry.getKey());
                 elementAdapter.write(out, obj.get(entry.getKey()));
               }
               out.setSerializeNulls(oldSerializeNulls); //restore
             }
             out.endObject();

           }

           @Override
           public UsageItem read(JsonReader in) throws IOException {
             JsonElement jsonElement = elementAdapter.read(in);
             validateJsonElement(jsonElement);
             JsonObject jsonObj = jsonElement.getAsJsonObject();
             // store additional fields in the deserialized instance
             UsageItem instance = thisAdapter.fromJsonTree(jsonObj);
             for (Map.Entry entry : jsonObj.entrySet()) {
               if (!openapiFields.contains(entry.getKey())) {
                 if (entry.getValue().isJsonPrimitive()) { // primitive type
                   if (entry.getValue().getAsJsonPrimitive().isString())
                     instance.putAdditionalProperty(entry.getKey(), entry.getValue().getAsString());
                   else if (entry.getValue().getAsJsonPrimitive().isNumber())
                     instance.putAdditionalProperty(entry.getKey(), entry.getValue().getAsNumber());
                   else if (entry.getValue().getAsJsonPrimitive().isBoolean())
                     instance.putAdditionalProperty(entry.getKey(), entry.getValue().getAsBoolean());
                   else
                     throw new IllegalArgumentException(String.format("The field `%s` has unknown primitive type. Value: %s", entry.getKey(), entry.getValue().toString()));
                 } else if (entry.getValue().isJsonArray()) {
                     instance.putAdditionalProperty(entry.getKey(), gson.fromJson(entry.getValue(), List.class));
                 } else { // JSON object
                     instance.putAdditionalProperty(entry.getKey(), gson.fromJson(entry.getValue(), HashMap.class));
                 }
               }
             }
             return instance;
           }

       }.nullSafe();
    }
  }

  /**
   * Create an instance of UsageItem given an JSON string
   *
   * @param jsonString JSON string
   * @return An instance of UsageItem
   * @throws IOException if the JSON string is invalid with respect to UsageItem
   */
  public static UsageItem fromJson(String jsonString) throws IOException {
    return JSON.getGson().fromJson(jsonString, UsageItem.class);
  }

  /**
   * Convert an instance of UsageItem to an JSON string
   *
   * @return JSON string
   */
  public String toJson() {
    return JSON.getGson().toJson(this);
  }
}





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