Android Open Source - sbicktAndroid Http Helper

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * #################################################
 * #            s'bickt Android Client             #
 * # Bildungseinrichtung:  Fachhochschule Salzburg #
 * #         Studiengang:  MultiMediaTechnology    #
 * #               Zweck:  Qualifikationsprojekt   #
 * #################################################
 *//from   w w  w  . j a  va  2s  . c om
 * This is the client for the augmented reality and social community app s'bickt
 * Copyright Alexander Flatscher, Ismail Hanli
 * 
 * This file is part of s'bickt.
 * 
 * S'bickt is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * S'bickt 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with s'bickt.  If not, see <http://www.gnu.org/licenses/>.
 */

package geotag.core;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.HTTP;

public class HttpHelper {
  private static String serverURL;
  private static HttpPost clientPostRequest;
  private static HttpDelete clientDeleteRequest;
  private static HttpClient client = new DefaultHttpClient();
  private static HttpHelper helperInstance = null;

  private HttpHelper(String url){
    clientPostRequest = new HttpPost(url);
    serverURL = url;
  }
  
  public static HttpHelper getInstance(String url) {
    if (helperInstance == null) {
      helperInstance = new HttpHelper(url);
    }
    else{
      clientPostRequest = new HttpPost(url);
      serverURL = url;
    }

    return helperInstance;
  }

  private HttpHelper(String url, String queryString){
    clientDeleteRequest = new HttpDelete(url + queryString);
    clientPostRequest = new HttpPost(url);
    serverURL = url;
  }
  
  public static HttpHelper getInstance(String url, String queryString) {
    if (helperInstance == null) {
      helperInstance = new HttpHelper(url, queryString);
    }
    else{
      clientDeleteRequest = new HttpDelete(url + queryString);
      clientPostRequest = new HttpPost(url);
      serverURL = url;
    }

    return helperInstance;
  }

  public String getURL() {
    return serverURL;
  }

  public static void setURL(String url) throws Exception {
    if(url == serverURL) {
      return;
    }
    
    serverURL = url;
    
    try {
      clientPostRequest.setURI(new URI(serverURL));
      clientDeleteRequest.setURI(new URI(serverURL));
    }
    catch (URISyntaxException e) {
      throw new Exception("HttpHelper -> setURL: Syntax error in URI");
    }
  }

  public Boolean POSTRequest(List<NameValuePair> geoTagData){
    try {
      clientPostRequest.setEntity(new UrlEncodedFormEntity(geoTagData, HTTP.UTF_8));

      checkForRequestError(clientPostRequest);
      
      return true;
    }
    catch (Exception e) {
      return false;
    }
  }
  
  public Boolean DELETERequest(){
    try{
      checkForRequestError(clientDeleteRequest);
      
      return true;
    }
    catch (Exception e) {
      return false;
    }
  }

  //TODO: the check for errors is not sufficient. work it over!
  
  private void checkForRequestError(HttpUriRequest request) throws Exception {    
    HttpResponse serverResponse = client.execute(request);
    HttpEntity entity = serverResponse.getEntity();
    
    if(entity != null){
      entity.consumeContent();
    }

    Header headers[] = serverResponse.getAllHeaders();
    String ignoreCase = Properties.getUrlIndex().substring(0,Properties.getUrlIndex().length() - 1);
    
    for (Header h : headers) {
      if (h.getName().equalsIgnoreCase("Location")) {
        if (h.getValue().equalsIgnoreCase(ignoreCase) || h.getValue().equalsIgnoreCase(Properties.getUrl() + "/index.html#section_wo")) {
          return;
        }
      }
    }
    
    throw new Exception("HttpHelper -> checkForRequestError: " + request.getMethod().toString() + " request failed");
  }
}

Java Source Code List

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