Android Open Source - BookHunter Rec Task

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Back to project page BookHunter.

License

The source code is released under:

Apache License

Java Source Code

package com.appspot.brownbookhunter;
/*w  w  w  .  j  ava2  s  .  co  m*/
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.Callable;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class RecTask implements Callable<List<Book>> {

  private static final String TAG = "RecTask";
  private String searchTerm;
  public RecTask(String searchTerm) {
    this.searchTerm = searchTerm;
    
  }
  @Override
  public List<Book> call() throws Exception {
    JSONObject recInfo = null;
    List<Book> bookRecs = new ArrayList<Book>();
    String recUrl = "http://brownbookhunter.appspot.com/recs";
    HttpClient hc = new DefaultHttpClient();
    try{
      HttpPost request = new HttpPost(recUrl);
      
      List<NameValuePair> params = new ArrayList<NameValuePair>(1);
      params.add(new BasicNameValuePair("call_no", searchTerm));
      request.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));

      HttpResponse response = hc.execute(request);
      
      recInfo = readResponse(response);
      JSONArray actualResult = (JSONArray) recInfo.get("thing");
      for (int i = 0; i < actualResult.length(); i++){
        bookRecs.add(new Book((JSONObject) actualResult.get(i)));
      }
      
      Collections.sort(bookRecs);
      
      Log.d(TAG, "search term was " + searchTerm);
      
    } catch (JSONException e) {
      Log.e(TAG, "Json exception: " + e.getMessage());
      Log.e(TAG, "Json exception: " + e.toString());
      e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
      Log.e(TAG, "Unsupported encoding: " + e.getMessage());
    } catch (ClientProtocolException e) {
      Log.e(TAG, "client protocol: " + e.getMessage());
    } catch (IOException e) {
      Log.e(TAG, "io exception: " + e.getMessage());
    } finally {
      hc.getConnectionManager().shutdown();
    }
    return bookRecs;
  }

  private JSONObject readResponse(HttpResponse response) throws IllegalStateException, IOException, JSONException {
    InputStream is = response.getEntity().getContent();
    StringBuilder result = new StringBuilder();
    int c;
    result.append("{ \"thing\": ");
    while ((c = is.read()) != -1) {
      result.append((char) c);
    }
    result.append("}");
    return new JSONObject(result.toString());
  }
}

Java Source Code List

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