Android Open Source - PicPosterComplete Elastic Search Operations

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License

The source code is released under:

Apache License

Java Source Code

package ca.ualberta.cs.picposter.network;
//from   w w w .  j ava2s.c  o m
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Type;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;

import android.graphics.Bitmap;
import android.util.Log;
import ca.ualberta.cs.picposter.PicPosterActivity;
import ca.ualberta.cs.picposter.model.PicPostModel;
import ca.ualberta.cs.picposter.model.PicPosterModelList;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;

/**
 * Handles sending PicPostModels to the server and executing searches on the server.
 * Most of the code in this class is based on: https://github.com/rayzhangcl/ESDemo
 * @author zjullion
 */
public class ElasticSearchOperations {


  public static final String SERVER_URL = "http://cmput301.softwareprocess.es:8080/testing/pic_poster/";
  public static final String LOG_TAG = "ElasticSearch";
  
  private static Gson GSON = null;


  /**
   * Sends a PicPostModel to the server.  Does nothing if the request fails.
   * @param model a PicPostModel
   */
  public static void pushPicPostModel(final PicPostModel model) {
    if (GSON == null)
      constructGson();

    Thread thread = new Thread() {

      @Override
      public void run() {
        HttpClient client = new DefaultHttpClient();
        HttpPost request = new HttpPost(SERVER_URL);

        try {
          request.setEntity(new StringEntity(GSON.toJson(model)));
        }
        catch (UnsupportedEncodingException exception) {
          Log.w(LOG_TAG, "Error encoding PicPostModel: " + exception.getMessage());
          return;
        }

        HttpResponse response;
        try {
          response = client.execute(request);
          Log.i(LOG_TAG, "Response: " + response.getStatusLine().toString());
        } 
        catch (IOException exception) {
          Log.w(LOG_TAG, "Error sending PicPostModel: " + exception.getMessage());
        }
      }
    };

    thread.start();
  }


  /**
   * Searches the server for PicPostModels with the given searchTerm in their text.
   * @param searchTerm the single world term to search for
   * @param model the PicPosterModelList to clear and then fill with the new data
   * @param activity a PicPosterActivity
   */
  public static void searchForPicPostModels(final String searchTerm, final PicPosterModelList model, 
      final PicPosterActivity activity) {
    if (GSON == null)
      constructGson();

    Thread thread = new Thread() {

      @Override
      public void run() {
        HttpClient client = new DefaultHttpClient();
        HttpPost request = new HttpPost(SERVER_URL + "_search");
        String query =   "{\"query\": {\"query_string\": {\"default_field\": \"text\",\"query\": \"*" + searchTerm + "*\"}}}";
        String responseJson = "";

        try {
          request.setEntity(new StringEntity(query));
        }
        catch (UnsupportedEncodingException exception) {
          Log.w(LOG_TAG, "Error encoding search query: " + exception.getMessage());
          return;
        }

        try {
          HttpResponse response = client.execute(request);
          Log.i(LOG_TAG, "Response: " + response.getStatusLine().toString());

          HttpEntity entity = response.getEntity();
          BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent()));

          String output = reader.readLine();
          while (output != null) {
            responseJson+= output;
            output = reader.readLine();
          }
        }
        catch (IOException exception) {
          Log.w(LOG_TAG, "Error receiving search query response: " + exception.getMessage());
          return;
        }

        Type elasticSearchSearchResponseType = new TypeToken<ElasticSearchSearchResponse<PicPostModel>>(){}.getType();
        final ElasticSearchSearchResponse<PicPostModel> returnedData = GSON.fromJson(responseJson, elasticSearchSearchResponseType);

        Runnable updateModel = new Runnable() {
          @Override
          public void run() {
            model.clear();
            model.addPicPostCollection(returnedData.getSources());
          }
        };

        activity.runOnUiThread(updateModel);
      }
    };

    thread.start();
  }
  
  
  /**
   * Constructs a Gson with a custom serializer / desserializer registered for Bitmaps.
   */
  private static void constructGson() {
    GsonBuilder builder = new GsonBuilder();
    builder.registerTypeAdapter(Bitmap.class, new BitmapJsonConverter());
    GSON = builder.create();
  }
}

Java Source Code List

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