Added "updateFromOther" and "compareWithOther" methods

src/de/danoeh/antennapod/feed/Feed.java

@@ -171,6 +171,72 @@ public class Feed extends FeedFile {
 		}
 	}
 
+	public void updateFromOther(Feed other) {
+		super.updateFromOther(other);
+		if (other.title != null) {
+			title = other.title;
+		}
+		if (other.feedIdentifier != null) {
+			feedIdentifier = other.feedIdentifier;
+		}
+		if (other.link != null) {
+			link = other.link;
+		}
+		if (other.description != null) {
+			description = other.description;
+		}
+		if (other.language != null) {
+			language = other.language;
+		}
+		if (other.author != null) {
+			author = other.author;
+		}
+		if (other.paymentLink != null) {
+			paymentLink = other.paymentLink;
+		}
+	}
+
+	public boolean compareWithOther(Feed other) {
+		if (super.compareWithOther(other)) {
+			return true;
+		}
+		if (!title.equals(other.title)) {
+			return true;
+		}
+		if (other.feedIdentifier != null) {
+			if (feedIdentifier == null
+					|| !feedIdentifier.equals(other.feedIdentifier)) {
+				return true;
+			}
+		}
+		if (other.link != null) {
+			if (link == null || !link.equals(other.link)) {
+				return true;
+			}
+		}
+		if (other.description != null) {
+			if (description == null || !description.equals(other.description)) {
+				return true;
+			}
+		}
+		if (other.language != null) {
+			if (language == null || !language.equals(other.language)) {
+				return true;
+			}
+		}
+		if (other.author != null) {
+			if (author == null || !author.equals(other.author)) {
+				return true;
+			}
+		}
+		if (other.paymentLink != null) {
+			if (paymentLink == null || !paymentLink.equals(other.paymentLink)) {
+				return true;
+			}
+		}
+		return false;
+	}
+
 	@Override
 	public int getTypeAsInt() {
 		return FEEDFILETYPE_FEED;

src/de/danoeh/antennapod/feed/FeedComponent.java

@@ -21,6 +21,25 @@ public class FeedComponent {
 		this.id = id;
 	}
 	
+	/**
+	 * Update this FeedComponent's attributes with the attributes from another
+	 * FeedComponent. This method should only update attributes which where read from
+	 * the feed.
+	 */
+	public void updateFromOther(FeedComponent other) {
+	}
+
+	/**
+	 * Compare's this FeedComponent's attribute values with another FeedComponent's
+	 * attribute values. This method will only compare attributes which were
+	 * read from the feed.
+	 * 
+	 * @return true if attribute values are different, false otherwise
+	 */
+	public boolean compareWithOther(FeedComponent other) {
+		return false;
+	}
+	
 	
 
 }

src/de/danoeh/antennapod/feed/FeedFile.java

@@ -26,6 +26,33 @@ public abstract class FeedFile extends FeedComponent {
 
 	public abstract int getTypeAsInt();
 
+	/**
+	 * Update this FeedFile's attributes with the attributes from another
+	 * FeedFile. This method should only update attributes which where read from
+	 * the feed.
+	 */
+	public void updateFromOther(FeedFile other) {
+		super.updateFromOther(other);
+		this.download_url = other.download_url;
+	}
+
+	/**
+	 * Compare's this FeedFile's attribute values with another FeedFile's
+	 * attribute values. This method will only compare attributes which were
+	 * read from the feed.
+	 * 
+	 * @return true if attribute values are different, false otherwise
+	 */
+	public boolean compareWithOther(FeedFile other) {
+		if (super.compareWithOther(other)) {
+			return true;
+		}
+		if (!download_url.equals(other.download_url)) {
+			return true;
+		}
+		return false;
+	}
+
 	public String getFile_url() {
 		return file_url;
 	}

src/de/danoeh/antennapod/feed/FeedItem.java

@@ -43,6 +43,38 @@ public class FeedItem extends FeedComponent {
 		this.read = true;
 	}
 
+	public void updateFromOther(FeedItem other) {
+		super.updateFromOther(other);
+		if (other.title != null) {
+			title = other.title;
+		}
+		if (other.getDescription() != null) {
+			description = other.getDescription();
+		}
+		if (other.getContentEncoded() != null) {
+			contentEncoded = other.contentEncoded;
+		}
+		if (other.link != null) {
+			link = other.link;
+		}
+		if (other.pubDate != null && other.pubDate != pubDate) {
+			pubDate = other.pubDate;
+		}
+		if (other.media != null) {
+			if (media == null || media.compareWithOther(media)) {
+				media.updateFromOther(other.media);
+			}
+		}
+		if (other.paymentLink != null) {
+			paymentLink = other.paymentLink;
+		}
+		if (other.chapters != null) {
+			if (chapters == null) {
+				chapters = other.chapters;
+			}
+		}
+	}
+
 	/**
 	 * Moves the 'description' and 'contentEncoded' field of feeditem to their
 	 * SoftReference fields.
@@ -215,7 +247,9 @@ public class FeedItem extends FeedComponent {
 		cachedContentEncoded = new SoftReference<String>(c);
 	}
 
-	public enum State {NEW, IN_PROGRESS, READ, PLAYING}
+	public enum State {
+		NEW, IN_PROGRESS, READ, PLAYING
+	}
 
 	public State getState() {
 		if (hasMedia()) {

src/de/danoeh/antennapod/feed/FeedMedia.java

@@ -65,6 +65,31 @@ public class FeedMedia extends FeedFile {
 		return MediaType.UNKNOWN;
 	}
 
+	public void updateFromOther(FeedMedia other) {
+		super.updateFromOther(other);
+		if (other.size > 0) {
+			size = other.size;
+		}
+		if (other.mime_type != null) {
+			mime_type = other.mime_type;
+		}
+	}
+
+	public boolean compareWithOther(FeedMedia other) {
+		if (super.compareWithOther(other)) {
+			return true;
+		}
+		if (other.mime_type != null) {
+			if (mime_type == null || !mime_type.equals(other.mime_type)) {
+				return true;
+			}
+		}
+		if (other.size > 0 && other.size != size) {
+			return true;
+		}
+		return false;
+	}
+
 	@Override
 	public int getTypeAsInt() {
 		return FEEDFILETYPE_FEEDMEDIA;

src/de/danoeh/antennapod/feed/SimpleChapter.java

@@ -12,4 +12,14 @@ public class SimpleChapter extends Chapter {
 		return CHAPTERTYPE_SIMPLECHAPTER;
 	}
 
+	public void updateFromOther(SimpleChapter other) {
+		super.updateFromOther(other);
+		start = other.start;
+		if (other.title != null) {
+			title = other.title;
+		}
+		if (other.link != null) {
+			link = other.link;
+		}
+	}
 }