Android Open Source - android-http Custom Class Loader

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License

The source code is released under:

Apache License

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Java Source Code

package com.example.markom.http.loader;
//from   www.ja va  2s  .c  om
import org.json.JSONException;
import org.json.JSONObject;

import android.content.Context;

import com.example.markom.http.schema.CustomServiceResponse;
import com.example.markom.http.schema.Meta;
import com.example.markom.http.schema.Pagination;
import com.markom.android.http.exceptions.GsonParsingException;
import com.markom.android.http.loader.BaseClassLoader;
import com.markom.android.http.model.ServiceResponse;
import com.markom.android.http.parser.GSONParser;

/**
 * Custom class loader that parses JSON schema assuming that schema is structured like following example:
 * <p>
 * { "meta":{ "success":true, "error_code":477, "error_type":"Service error", "error_message":"Invalid API key",
 * "user_error_message":"Personal information changed" },
 * <p>
 * "pagination":{ "page_from":1, "page_to":1, "number_of_pages":10, "next_url":"www.getnextpage.com", "has_more":true },
 * <p>
 * "data":{ "name":"Marko", "is_male":true, "age":23, "saldo":36.44, "timestamp":12343453, "friends":[ { "name":"Tina",
 * "is_male":false, "age":21, "saldo":234.44, "timestamp":123456, "friends":[] }, { "name":"Nikola", "is_male":true,
 * "age":18, "saldo":100.44, "timestamp":4848488, "friends":[] } ] } }
 * 
 * @author Marko Milos
 * 
 * @param <T> generic type of object to parse.
 */
public class CustomClassLoader<T> extends BaseClassLoader<T> {

  public CustomClassLoader(Context context, String url, Class<T> clazz) {
    super(context, url, clazz);
  }

  @Override
  protected ServiceResponse<T> parseServiceResponse(String response) throws GsonParsingException {
    try {
      // Retrive json objects from JSON schema
      JSONObject jsonObject = new JSONObject(response);
      JSONObject metaObject = jsonObject.getJSONObject("meta");
      JSONObject paginationObject = jsonObject.getJSONObject("pagination");
      JSONObject dataObject = jsonObject.getJSONObject("data");

      // Use GSONParser to create object from json string
      Meta meta = GSONParser.createObjectFromResponse(Meta.class, metaObject.toString());
      Pagination pagination = GSONParser.createObjectFromResponse(Pagination.class, paginationObject.toString());
      T data = GSONParser.createObjectFromResponse(clazz, dataObject.toString());

      // Setup CustomServiceResponse that extends ServiceResponse class and return the result
      CustomServiceResponse<T> customServiceResponse = new CustomServiceResponse<T>();
      customServiceResponse.setMeta(meta);
      customServiceResponse.setPagination(pagination);
      customServiceResponse.setData(data);
      return customServiceResponse;

    } catch (JSONException e) {
      throw new GsonParsingException(e.getMessage());
    }
  }

}

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