Android Open Source - sms-smap-gateway Api Request

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.android.smap.api.requests;
/* www.j a v a 2s .  c  o  m*/
import android.text.TextUtils;
import android.util.Log;

import com.android.smap.GatewayApp;
import com.android.smap.api.ApiConstants;
import com.android.volley.DefaultRetryPolicy;
import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.Response.ErrorListener;
import com.android.volley.Response.Listener;
import com.android.volley.toolbox.HttpHeaderParser;
import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonSyntaxException;
import com.google.gson.reflect.TypeToken;

/**
 * Generic API request for a GoJo
 * 
 * @author matt witherow
 * @param <T>
 */
public abstract class ApiRequest<T> extends Request<T> implements ApiConstants {

  protected Listener<T>    mListener;
  protected FieldNamingPolicy  mNamingPolicy  = FieldNamingPolicy.IDENTITY;

  public ApiRequest(int method, String url, Listener<T> listener,
      ErrorListener errorListener) {
    super(method, url, errorListener);
    Log.d("ApiRequest", "SENDING VOLLEY REQ  : " + url);
    mListener = listener;
    setRetryPolicy(new DefaultRetryPolicy((int) GatewayApp.getAppConfig()
        .getTimeoutInMillis(), DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
        DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
  }

  @Override
  protected void deliverResponse(T response) {
    mListener.onResponse(response);
  }

  @Override
  protected Response<T> parseNetworkResponse(NetworkResponse response) {
    try {
      String jsonString = new String(response.data);
      T responseModel = createGsonModel(jsonString);
      return Response.success(responseModel,
          HttpHeaderParser.parseCacheHeaders(response));
    }
    catch (JsonSyntaxException e) {
      return Response.error(new ParseError(e));
    }
    catch (Exception e) {
      return Response.error(new ParseError(e));
    }
  }

  /**
   * Generates model using GSON
   * 
   * @param jsonString
   * @return
   */
  private T createGsonModel(String jsonString) throws JsonSyntaxException,
      IllegalArgumentException {

    // if no json return null
    if (TextUtils.isEmpty(jsonString)) {
      throw new IllegalArgumentException();
    }

    GsonBuilder builder = new GsonBuilder()
        .setFieldNamingPolicy(mNamingPolicy);

    JsonDeserializer<T> deserializer = getCustomDeserializer();
    if (deserializer != null) {
      builder.registerTypeAdapter(getGsonTypeToken().getType(),
          deserializer);
    }

    Gson gson = builder.create();

    // parse the result
    T model = gson.fromJson(jsonString, getGsonTypeToken().getType());
    return model;
  }

  /**
   * Provide {@link TypeToken} for the GSON deserialization of the Model.
   * 
   * @return
   */
  protected abstract TypeToken<T> getGsonTypeToken();

  /**
   * Override and provide a custom GSON deserializer if required.
   * 
   * @return
   */
  protected JsonDeserializer<T> getCustomDeserializer() {
    return null;
  }
}

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