Android Open Source - Go2-Rennes Remote Service

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Back to project page Go2-Rennes.

License

The source code is released under:

GNU General Public License

Java Source Code

/*******************************************************************************
 * Copyright (c) 2011 Michel DAVID mimah35-at-gmail.com
 * /*from ww w . j  a va2  s.c  o m*/
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package fr.gotorennes.remote;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URLEncoder;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import android.util.Log;

public abstract class RemoteService<T> {

  private static final String TAG = "GoToRennes.RemoteService";

  private static final String apiUrl = "http://data.keolis-rennes.com/json/?version={0}&key=FL8WIPQHEFFIIQI&cmd=";

  private static HttpClient httpclient = new DefaultHttpClient();

  protected abstract T populate(JSONObject jsonObject) throws JSONException;
  
  protected abstract String getVersion();

  protected T loadObject(String command, String nodeName, Map<String, String> parameters) {
    String commandeWithParameters = getCommandWithParameters(command, parameters);

    JSONObject data = getData(commandeWithParameters);
    if (data != null) {
      try {
        onDataLoad(data);
        return populate(data.getJSONObject(nodeName));
      } catch (Exception e) {
        Log.e(TAG, "Echec de lecture de la rponse du service distant : " + e.getMessage());
      }
    }
    return null;
  }

  protected List<T> loadList(String command, String nodeName, Map<String, String> parameters) {
    String commandeWithParameters = getCommandWithParameters(command, parameters);

    JSONObject data = getData(commandeWithParameters);

    List<T> result = null;
    if (data != null) {
      try {
        onDataLoad(data);

        try {
          JSONArray jsonArray = data.optJSONArray(nodeName);
          if (jsonArray != null) {
            result = new ArrayList<T>();
            for (int i = 0; i < jsonArray.length(); i++) {
              JSONObject jsonObject = jsonArray.getJSONObject(i);
              result.add(populate(jsonObject));
            }
          } else {
            JSONObject jsonObject = data.optJSONObject(nodeName);
            if (jsonObject != null) {
              result = new ArrayList<T>();
              result.add(populate(jsonObject));
            }
          }
        } catch (Exception e) {

        }
      } catch (Exception e) {
        Log.e(TAG, "Echec de lecture de la rponse du service distant : " + e.getMessage());
      }
    }
    return result;
  }

  protected void onDataLoad(JSONObject data) throws JSONException {
    // Nothing
  }

  protected List<T> loadList(String command, String nodeName) {
    return loadList(command, nodeName, new HashMap<String, String>());
  }

  protected String getCommandWithParameters(String command, Map<String, String> parameters) {
    StringBuilder stringBuilder = new StringBuilder(command);
    for (Map.Entry<String, String> entry : parameters.entrySet()) {
      stringBuilder.append("&param[");
      stringBuilder.append(entry.getKey());
      stringBuilder.append("]=");
      stringBuilder.append(URLEncoder.encode(entry.getValue()));
    }
    return stringBuilder.toString();
  }

  protected JSONObject getData(String command) {

    String url = MessageFormat.format(apiUrl, getVersion()) + command;
    Log.d("GoToRennes", url);
    HttpEntity entity = getEntity(url);
    
    if (entity == null) {
      return null;
    }

    String json = readFully(entity);
    if (json == null) {
      return null;
    }

    try {
      JSONObject object = (JSONObject) new JSONTokener(json).nextValue();
      JSONObject opendata = object.getJSONObject("opendata");
      JSONObject answer = opendata.getJSONObject("answer");
      return answer.optJSONObject("data");

    } catch (Exception e) {
      Log.e(TAG, "Echec de lecture de la rponse du service distant : " + e.getMessage());
    }
    return null;
  }

  public static HttpEntity getEntity(String url) {
    HttpGet httpget = new HttpGet(url);
    try {
      HttpResponse response = httpclient.execute(httpget);
      if (response != null) {
        return response.getEntity();
      }
    } catch (Exception e) {
      Log.e(TAG, "Echec d'accs au service distant : " + e.getMessage());
    }
    return null;
  }
  
  public static String readFully(String url) {
    HttpEntity entity = getEntity(url);
    if (entity == null) {
      return null;
    }
    return readFully(entity);
  }

  public static String readFully(HttpEntity entity) {
    InputStream instream = null;
    try {
      instream = entity.getContent();
      BufferedReader reader = new BufferedReader(new InputStreamReader(instream));

      StringBuilder json = new StringBuilder();
      String line = null;
      while ((line = reader.readLine()) != null) {
        json.append(line);
      }
      return json.toString();
    } catch (Exception e) {
      Log.e(TAG, "Echec de lecture de la rponse du service distant : " + e.getMessage());
    } finally {
      if (instream != null) {
        try {
          instream.close();
        } catch (Exception e) {
          Log.e(TAG, "Echec de fermeture du flux du service distant : " + e.getMessage());
        }
      }
    }
    return null;
  }
}

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