Android Open Source - android_rss_reader Feed Item Helper

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License

The source code is released under:

Apache License

Java Source Code

/***********************************************************************************************************************
 * ==========================================
 */*from   w w w.ja v  a 2s. 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.util.Log;
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.fragments.BaseListFragment.OnModelsLoadedListener;
import net.oremland.rss.reader.models.*;

public class FeedItemHelper
{
  private final static HashMap<String, FeedItemCache> caches = new HashMap<String, FeedItemCache>();

  public void getFeedItems(String url, OnModelsLoadedListener<FeedItem> listener)
  {
    FeedItemCache cache = this.cacheForUrl(url);
    if(cache.size() > 0)
    {
      listener.onModelsLoaded(cache.asList());
      return;
    }

    this.downloadFeedItems(url, listener);
  }

  private void downloadFeedItems(String url, OnModelsLoadedListener<FeedItem> listener)
  {
    if(!TextUtils.isEmpty(url) && listener != null)
    {
      AsyncHttpDownloader downloader = this.createDownloader(listener, url);
      downloader.execute(url);
    }
  }

  private AsyncHttpDownloader createDownloader(final OnModelsLoadedListener<FeedItem> listener, final String url)
  {
    AsyncHttpDownloader downloader = this.getDownloader();
    downloader.setOnDownloadListener(new AsyncHttpDownloader.OnDownloadListener()
    {
      public void onProgress(int progress)
      {
        onTaskProgress(listener, progress);
      }

      public void onComplete(byte[] result)
      {
        onDownloadComplete(listener, result, url);
      }

      public void onError(Exception exception)
      {
        onTaskError(listener, exception);
      }

    });
    return downloader;
  }

  protected AsyncHttpDownloader getDownloader()
  {
    return new AsyncHttpDownloader();
  }

  private void onTaskProgress(OnModelsLoadedListener<FeedItem> listener, int progress)
  {
  }

  private void onDownloadComplete(OnModelsLoadedListener<FeedItem> listener, byte[] result, String url)
  {
    if(listener != null
      && result != null
      && result.length > 0)
    {
      String data = new String(result);
      parseItemsFromData(listener, data, url);
    }
  }

  private void onTaskError(OnModelsLoadedListener<FeedItem> listener, Exception exception)
  {
    Log.e(this.getClass().getName(), exception.toString(), exception);
  }

  protected void parseItemsFromData(OnModelsLoadedListener<FeedItem> listener, String data, String url)
  {
    FeedParser parser = new FeedParser();
    parser.setOnParseListener(this.createOnParseListener(listener, url));
    parser.execute(data);
  }

  private FeedParser.OnParseListener createOnParseListener(final OnModelsLoadedListener<FeedItem> listener, final String url)
  {
    return new FeedParser.OnParseListener()
    {
      @Override
      public void onProgress(int progress)
      {
        onTaskProgress(listener, progress);
      }

      @Override
      public void onComplete(List<FeedItem> items)
      {
        onParseComplete(listener, items, url);
      }

      @Override
      public void onError(Exception exception)
      {
        onTaskError(listener, exception);
      }
    };
  }

  private void onParseComplete(OnModelsLoadedListener<FeedItem> listener, List<FeedItem> items, String url)
  {
    if(listener != null && items != null)
    {
      this.cacheFeedItems(url, items);
      listener.onModelsLoaded(items);
    }
  }

  private synchronized void cacheFeedItems(String url, List<FeedItem> items)
  {
    FeedItemCache cache = this.cacheForUrl(url);
    for(FeedItem item : items)
    {
      cache.add(item);
    }
  }

  protected synchronized FeedItemCache cacheForUrl(String url)
  {
    if(!caches.containsKey(url))
    {
      caches.put(url, new FeedItemCache());
    }

    return caches.get(url);
  }
}

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