Android Open Source - com.elsewhat.android.slideshow O P M L Backend

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License

The source code is released under:

Copyright (C) 2012 Dagfinn Parnas <dagfinn.parnas@gmail.com> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Sof...

Java Source Code

package com.elsewhat.android.slideshow.backend;
//from  w ww .  java2s.c  om
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.InputSource;

import android.content.Context;
import android.util.Log;

import com.elsewhat.android.slideshow.activities.SlideshowActivity;
import com.elsewhat.android.slideshow.api.SlideshowBackend;
import com.elsewhat.android.slideshow.api.SlideshowPhoto;

/**
 * Backend specific for StuckInCustoms
 * 
 * 
 * @author dagfinn.parnas
 *
 */
public class OPMLBackend implements SlideshowBackend {
  
  
  public OPMLBackend(){
    
  }
  
  /**
   * Retrieve the slideshow photos from the remote source
   * 
   * 
   * @param context
   * @return List of SlideshowPhoto objects
   */
  public List<SlideshowPhoto> getSlideshowPhotos(Context context) throws Throwable {
    String feedURL = "http://dl.dropbox.com/u/4379928/Slideshow/elsewhat_slideshow.xml";  
    
    //String feedResponse = null;
    InputStream responseInputStream=null;
    String exceptionMessage="Could not download photos list";
    try {
      //setup the HTTP request
      DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet request = new HttpGet(feedURL);
            HttpParams httpParameters = httpClient.getParams();
            HttpConnectionParams.setConnectionTimeout(httpParameters, 60 * 1000);
            HttpConnectionParams.setSoTimeout        (httpParameters, 60 * 1000);

      //perform the HTTP request
            HttpResponse response = httpClient.execute(request);
            int responseCode = response.getStatusLine().getStatusCode();
            Log.i(SlideshowActivity.LOG_PREFIX, responseCode  + " response code for download of " + feedURL  );
            
            if(responseCode==200){
              responseInputStream=response.getEntity().getContent();
              //feedResponse = getStringFromInputStream(response.getEntity().getContent());
            }else {
              String message=responseCode  + " for feed was not 200. Will not write to file";
              Log.w(SlideshowActivity.LOG_PREFIX,  message );
              throw new IOException(exceptionMessage);
            }

      
      ArrayList<SlideshowPhoto> alSmugMugPhotos = new ArrayList<SlideshowPhoto>(50);
      
      InputSource inputSource = new InputSource(responseInputStream);
      //We do DOM parsing as xmls are fairly small
      DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
      DocumentBuilder db = dbf.newDocumentBuilder();
      Document doc = db.parse(inputSource);
      doc.getDocumentElement().normalize();

      NodeList photoElements = doc.getElementsByTagName("photo");

      //loop through photo elements
      for (int i = 0; i < photoElements.getLength(); i++) {
        Node photoNode = photoElements.item(i);
        SlideshowPhoto slideshowPhoto = new SlideshowPhoto();
        
        //for each element check if it has children for the various attributes we are search for
        if (photoNode.hasChildNodes() && photoNode instanceof Element){
          Element photoElement = (Element)photoNode; 
          NodeList photoAttributeElements = photoElement.getChildNodes();
          
          //promtion elements might contain link to premium version or similar
          if (photoElement.hasAttribute("promotion")){
            slideshowPhoto.setPromotion(true);
          }
          
          for (int j = 0; j < photoAttributeElements.getLength(); j++) {
            Node attributeElement = photoAttributeElements.item(j);
            String attributeName = attributeElement.getNodeName();
            String attributeValue = null;
            if(attributeElement.hasChildNodes()){
              Node childNode = attributeElement.getFirstChild();
              if(childNode instanceof Text){
                attributeValue = ((Text)childNode).getData();
              }
            }
            attributeValue = (attributeValue!=null)?attributeValue.trim():null;
          
            
            if(attributeName!=null && attributeValue!=null){
              //why isn't there switch with strings yet?
              if(attributeName.equalsIgnoreCase("title")){
                slideshowPhoto.setTitle(attributeValue);
              }else if(attributeName.equalsIgnoreCase("description")){
                slideshowPhoto.setDescription(attributeValue);
              }else if(attributeName.equalsIgnoreCase("thumbnail")){
                slideshowPhoto.setThumbnail(attributeValue);
              }else if(attributeName.equalsIgnoreCase("url")){
                slideshowPhoto.setLargePhoto(attributeValue);
              }else if(attributeName.equalsIgnoreCase("small300")){
                slideshowPhoto.setSmallPhoto(attributeValue);
              }/*else {
                Log.w(SlideshowActivity.LOG_PREFIX, "Unknown attribute found in XML " + attributeName + " with value "+ attributeValue);
              }*/
            }
          }
          
          if(slideshowPhoto.getLargePhoto()==null){
            Log.w(SlideshowActivity.LOG_PREFIX, "Slideshow photo not parsed correctly from xml. Is missing essential attribute. Slideshowphoto" +slideshowPhoto);
          }else {
            //add photo to list
            alSmugMugPhotos.add(slideshowPhoto);
          }
          
        }
      }
      
      if(alSmugMugPhotos.size()==0){
        return null;
      }else {
        return alSmugMugPhotos;
      }
      
    } catch (MalformedURLException e) {
      // TODO Auto-generated catch block
      Log.w(SlideshowActivity.LOG_PREFIX, "MalformedURLException " + e.getMessage(),e);
      throw new MalformedURLException(exceptionMessage);
    } catch (IOException e) {
      // TODO Auto-generated catch block
      Log.w(SlideshowActivity.LOG_PREFIX, "IOException " + e.getMessage(),e);
      throw new IOException(exceptionMessage);
    }
    
    
  }

}

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