Android Open Source - android_rss_reader Feed Parser

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License

The source code is released under:

Apache License

Java Source Code

/***********************************************************************************************************************
 * ==========================================
 */*from   www .  ja  v a  2  s  .c  om*/
 * Copyright (C) 2013 by Paul Oremland
 * http://www.linkedin.com/in/pauloremland
 * https://github.com/poremland
 *
 ***********************************************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 ***********************************************************************************************************************/
package net.oremland.rss.reader.helpers;

import android.os.AsyncTask;
import android.text.TextUtils;

import com.google.code.rome.android.repackaged.com.sun.syndication.feed.synd.*;
import com.google.code.rome.android.repackaged.com.sun.syndication.io.SyndFeedInput;
import com.google.code.rome.android.repackaged.com.sun.syndication.io.XmlReader;

import java.util.*;
import java.io.*;

import net.oremland.rss.reader.models.FeedItem;

public class FeedParser
  extends
    AsyncTask<String, Integer, List<FeedItem>>
{
  private OnParseListener listener = null;
  private Exception exception = null;

  public interface OnParseListener
  {
    void onProgress(int progress);
    void onComplete(List<FeedItem> items);
    void onError(Exception exception);
  }

  public void setOnParseListener(OnParseListener listener)
  {
    this.listener = listener;
  }

  @Override
  protected List<FeedItem> doInBackground(String... data)
  {
    if(this.listener != null && data != null)
    {
      try
      {
        return parse(data[0]);
      }
      catch(Exception e)
      {
        this.exception = e;
      }
    }
    return new ArrayList<FeedItem>();
  }

  @Override
  protected void onProgressUpdate(Integer... progress)
  {
    this.listener.onProgress(progress[0]);
  }

  @Override
  protected void onPostExecute(List<FeedItem> items)
  {
    if(exception != null)
    {
      this.listener.onError(this.exception);
      return;
    }
    this.listener.onComplete(items);
  }

  private List<FeedItem> parse(String feedXml)
  {
    List<SyndEntry> entries = this.entriesForFeed(feedXml);
    return this.convertEntriesListItemList(entries);
  }

  private List<FeedItem> convertEntriesListItemList(List<SyndEntry> entries)
  {
    List<FeedItem> map = new ArrayList<FeedItem>();

    for(SyndEntry entry : entries)
    {
      FeedItem item = this.convertEntryToFeedItem(entry);
      if(item != null)
      {
        map.add(item);
      }
    }

    return map;
  }

  private FeedItem convertEntryToFeedItem(SyndEntry entry)
  {
    if(entry != null)
    {
      String content = this.getEntryContent(entry);
      String description = entry.getDescription() == null ? content : entry.getDescription().getValue();
      String title = entry.getTitle();
      String url = entry.getLink();
      Date date = entry.getUpdatedDate() == null ? entry.getPublishedDate() : entry.getUpdatedDate();
      return new FeedItem(content, description, title, url, date);
    }
    return null;
  }

  private String getEntryContent(SyndEntry entry)
  {
    List contents = entry.getContents();
    StringBuffer buffer = new StringBuffer();
    for(int index=0;contents != null && index < contents.size();index++)
    {
      SyndContent content = (SyndContent)contents.get(index);
      buffer.append(content.getValue());
    }

    return (buffer.length() == 0) ? entry.getDescription().getValue() : buffer.toString();
  }

  private List<SyndEntry> entriesForFeed(String xml)
  {
    ArrayList<SyndEntry> entries = new ArrayList<SyndEntry>();
    XmlReader reader = this.xmlReaderForFeed(xml);
    if(reader != null)
    {
      try
      {
        SyndFeed feed = new SyndFeedInput().build(reader);

        for (Iterator i = feed.getEntries().iterator(); i.hasNext();)
        {
          entries.add((SyndEntry)i.next());
        }
      }
      catch(Exception exception)
      {
        exception.printStackTrace();
      }
      finally
      {
        if(reader != null)
        {
          try
          {
            reader.close();
          }
          catch(IOException ioException)
          {
            ioException.printStackTrace();
          }
        }
      }
    }
    return entries;
  }

  private XmlReader xmlReaderForFeed(String xml)
  {
    if(!TextUtils.isEmpty(xml))
    {
      try
      {
        InputStream stream = new ByteArrayInputStream(xml.getBytes("UTF-8"));
        return new XmlReader(stream, true);
      }
      catch(Exception exception)
      {
        exception.printStackTrace();
      }
    }
    return null;
  }
}

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