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package de.podfetcher.feed;
import java.util.ArrayList;
import de.podfetcher.storage.*;
import android.content.Context;
import android.database.Cursor;
/**
* Singleton class
* Manages all feeds, categories and feeditems
*
*
* */
public class FeedManager {
private static FeedManager singleton;
private ArrayList<Feed> feeds;
private ArrayList<FeedCategory> categories;
Cursor feedlistCursor;
private FeedManager() {
feeds = new ArrayList<Feed>();
categories = new ArrayList<FeedCategory>();
}
public static FeedManager getInstance(){
if(singleton == null) {
singleton = new FeedManager();
}
return singleton;
}
private void addNewFeed(Context context, Feed feed) {
feeds.add(feed);
feed.setId(setFeed(context, feed));
for(FeedItem item : feed.getItems()) {
setFeedItem(context, item);
}
}
/** Adds a new Feeditem if its not in the list */
public void addFeedItem(Context context, FeedItem item) {
PodDBAdapter adapter = new PodDBAdapter(context);
// Search list for feeditem
Feed feed = item.getFeed();
FeedItem foundItem = searchFeedItemByLink(feed, item.getLink());
if(foundItem != null) {
// Update Information
item.id = foundItem.id;
foundItem = item;
item.setRead(foundItem.isRead());
adapter.setFeedItem(item);
} else {
feed.getItems().add(item);
item.id = adapter.setFeedItem(item);
}
}
public void updateFeed(Context context, Feed newFeed) {
// Look up feed in the feedslist
Feed savedFeed = searchFeedByLink(newFeed.getLink());
if(savedFeed == null) {
// Add a new Feed
addNewFeed(context, newFeed);
}else {
// Look for new or updated Items
for(FeedItem item : newFeed.getItems()) {
FeedItem oldItem = searchFeedItemByLink(savedFeed, item.getLink());
if(oldItem != null) {
FeedItem newItem = searchFeedItemByLink(newFeed, item.getLink());
if(newItem != null) {
newItem.setRead(oldItem.isRead());
}
}
}
newFeed.setId(savedFeed.getId());
savedFeed = newFeed;
setFeed(context, newFeed);
}
}
/** Get a Feed by its link */
private Feed searchFeedByLink(String link) {
for(Feed feed : feeds) {
if(feed.getLink().equals(link)) {
return feed;
}
}
return null;
}
/** Get a FeedItem by its link */
private FeedItem searchFeedItemByLink(Feed feed, String link) {
for(FeedItem item : feed.getItems()) {
if(item.getLink().equals(link)) {
return item;
}
}
return null;
}
/** Updates Information of an existing Feed */
public long setFeed(Context context, Feed feed) {
PodDBAdapter adapter = new PodDBAdapter(context);
return adapter.setFeed(feed);
}
public long setFeedItem(Context context, FeedItem item) {
PodDBAdapter adapter = new PodDBAdapter(context);
return adapter.setFeedItem(item);
}
/** Updates information of an existing FeedImage */
public long setFeedImage(Context context, FeedImage image) {
PodDBAdapter adapter = new PodDBAdapter(context);
return adapter.setImage(image);
}
/** Get a Feed by its id */
public Feed getFeed(long id) {
for(Feed f : feeds) {
if(f.id == id) {
return f;
}
}
return null;
}
/** Get a Feed Image by its id */
public FeedImage getFeedImage(long id) {
for(Feed f : feeds) {
FeedImage image = f.getImage();
if(image != null && image.getId() == id) {
return image;
}
}
return null;
}
/** Reads the database */
public void loadDBData(Context context) {
PodDBAdapter adapter = new PodDBAdapter(context);
feedlistCursor = adapter.getAllFeedsCursor();
updateArrays(context);
}
public void updateArrays(Context context) {
feedlistCursor.requery();
PodDBAdapter adapter = new PodDBAdapter(context);
feeds.clear();
categories.clear();
extractFeedlistFromCursor(context);
}
private void extractFeedlistFromCursor(Context context) {
PodDBAdapter adapter = new PodDBAdapter(context);
if(feedlistCursor.moveToFirst()) {
do {
Feed feed = new Feed();
feed.id = feedlistCursor.getLong(feedlistCursor.getColumnIndex(PodDBAdapter.KEY_ID));
feed.setTitle(feedlistCursor.getString(feedlistCursor.getColumnIndex(PodDBAdapter.KEY_TITLE)));
feed.setLink(feedlistCursor.getString(feedlistCursor.getColumnIndex(PodDBAdapter.KEY_LINK)));
feed.setDescription(feedlistCursor.getString(feedlistCursor.getColumnIndex(PodDBAdapter.KEY_DESCRIPTION)));
feed.setImage(adapter.getFeedImage(feed));
feed.file_url = feedlistCursor.getString(feedlistCursor.getColumnIndex(PodDBAdapter.KEY_FILE_URL));
feed.download_url = feedlistCursor.getString(feedlistCursor.getColumnIndex(PodDBAdapter.KEY_DOWNLOAD_URL));
// Get FeedItem-Object
Cursor itemlistCursor = adapter.getAllItemsOfFeedCursor(feed);
feed.setItems(extractFeedItemsFromCursor(context, itemlistCursor));
feeds.add(feed);
}while(feedlistCursor.moveToNext());
}
}
private ArrayList<FeedItem> extractFeedItemsFromCursor(Context context, Cursor itemlistCursor) {
ArrayList<FeedItem> items = new ArrayList<FeedItem>();
PodDBAdapter adapter = new PodDBAdapter(context);
if(itemlistCursor.moveToFirst()) {
do {
FeedItem item = new FeedItem();
item.id = itemlistCursor.getLong(itemlistCursor.getColumnIndex(PodDBAdapter.KEY_ID));
item.setTitle(itemlistCursor.getString(itemlistCursor.getColumnIndex(PodDBAdapter.KEY_TITLE)));
item.setLink(itemlistCursor.getString(itemlistCursor.getColumnIndex(PodDBAdapter.KEY_LINK)));
item.setDescription(itemlistCursor.getString(itemlistCursor.getColumnIndex(PodDBAdapter.KEY_DESCRIPTION)));
item.setPubDate(itemlistCursor.getString(itemlistCursor.getColumnIndex(PodDBAdapter.KEY_PUBDATE)));
item.setMedia(adapter.getFeedMedia(itemlistCursor.getLong(itemlistCursor.getColumnIndex(PodDBAdapter.KEY_MEDIA))));
item.setRead((itemlistCursor.getInt(itemlistCursor.getColumnIndex(PodDBAdapter.KEY_READ)) > 0) ? true : false);
items.add(item);
} while(itemlistCursor.moveToNext());
}
return items;
}
public ArrayList<Feed> getFeeds() {
return feeds;
}
}
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