Android Open Source - Team7-301Project Search Controller

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License

The source code is released under:

Apache License

Java Source Code

package ca.ualberta.cs.controllers;
//  ww w .j  a  va  2 s  .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 java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
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.util.Log;
import ca.ualberta.cs.f14t07_application.Hits;
import ca.ualberta.cs.models.ForumEntry;
import ca.ualberta.cs.remote_server.SearchHit;
import ca.ualberta.cs.remote_server.SearchResponse;
import ca.ualberta.cs.remote_server.SimpleSearchCommand;

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

/**
 * Controls the data in the model of the SearchActivity
 * It also handles searching for queries and processing the results
 * 
 * taken in part from:
 * https://github.com/dfserrano/AndroidElasticSearch
 * 
 * @author lexie
 */
public class SearchController
{
  private ArrayList<ForumEntry> searchResult;
  private HttpClient httpclient = new DefaultHttpClient();
  private Gson gson;
  
  private static final String SEARCH_URL = "http://cmput301.softwareprocess.es:8080/cmput301f14t07/ForumEntry/_search";
  private static final String TAG = "ForumEntrySearch";


  /**
   * Constructor
   */
  public SearchController()
  {
    searchResult = new ArrayList<ForumEntry>();
    gson = new Gson();
  }

  /**
   * Searches the forum entries in the remote server for a specific term.
   * 
   * 
   * @param searchString The term to search for. pass as null, "", or "*" to perform a 
   * search for everything.
   * @param field pass as null
   * @return an ArrayList<ForumEntry> containing all the ForumEntries which match the search
   * term.
   * @throws ClientProtocolException, IOException
   * */
  public ArrayList<ForumEntry> searchForumEntries(String searchString, String field,Boolean byLocation)
      throws ClientProtocolException, IOException
  {
    ArrayList<ForumEntry> result = new ArrayList<ForumEntry>();
    // TODO: Implement search movies using ElasticSearch
    if ("".equals(searchString) || searchString == null)
    {
      searchString = "*";
    }
    HttpClient httpClient = new DefaultHttpClient();

    try
    {
      HttpPost searchRequest = createSearchRequest(searchString, field, byLocation);
      HttpResponse response = httpClient.execute(searchRequest);

      String status = response.getStatusLine().toString();
      Log.i(TAG, status);

      SearchResponse<ForumEntry> esResponse = parseSearchResponse(response);

      Hits<ForumEntry> hits = esResponse.getHits();
      int i = 0;
      if (hits != null)
      {
        if (hits.getHits() != null)
        {
          // there are movies in the search
          for (SearchHit<ForumEntry> sesr : hits.getHits())
          {
            result.add(sesr.getSource());
            result.get(i).setId(sesr.get_id());
            i++;
          }
        }
      }
    } catch (UnsupportedEncodingException e)
    {
      e.printStackTrace();
    }
    return result;
  }
  public ArrayList<ForumEntry> searchForumEntries(String searchString, String field) throws ClientProtocolException, IOException{
     return searchForumEntries(searchString,field,false);
  }
  /**
   * creates the search request
   * @param byLocation 
   * 
   * @param the
   *            term, and the field
   * @throws UnsupportedEncodingException
   * @return search Request
   * */
  private HttpPost createSearchRequest(String searchString, String field, Boolean byLocation)
      throws UnsupportedEncodingException
  {

    HttpPost searchRequest = new HttpPost(SEARCH_URL);

    String[] fields = null;
    if (field != null)
    {
      fields = new String[1];
      fields[0] = field;
    }

    SimpleSearchCommand command = new SimpleSearchCommand(searchString,
        fields, byLocation);

    String query = command.getJsonCommand();
    Log.i(TAG, "Json command: " + query);

    StringEntity stringEntity;
    stringEntity = new StringEntity(query);

    searchRequest.setHeader("Accept", "application/json");
    searchRequest.setEntity(stringEntity);

    return searchRequest;
  }

  /**
   * parses through the response from elasticsearch
   * 
   * @param the
   *            response
   * @throws IOException
   * @return Elastic Search Response
   * */
  private SearchResponse<ForumEntry> parseSearchResponse(HttpResponse response)
      throws IOException
  {
    String json;
    json = getEntityContent(response);

    Type searchResponseType = new TypeToken<SearchResponse<ForumEntry>>()
    {
    }.getType();

    SearchResponse<ForumEntry> esResponse = gson.fromJson(json,
        searchResponseType);

    return esResponse;

  }

  /**
   * gets the response from elasticsearch
   * 
   * @param the
   *            response
   * @throws IOException
   * @return the string of the response
   * */
  public String getEntityContent(HttpResponse response) throws IOException
  {
    BufferedReader rd = new BufferedReader(new InputStreamReader(response
        .getEntity().getContent()));

    StringBuffer result = new StringBuffer();
    String line = "";

    while ((line = rd.readLine()) != null)
    {
      result.append(line);
    }

    return result.toString();
  }

}

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