Speed up feed parsing (#7023)

AntennaPod is quite slow with huge feeds. The reason is that we have a bunch of workarounds for misbehaving feeds that also make it slower to work with feeds that do not misbehave.

Changes:

- Only start guessing duplicate episodes when no "proper" match is found
- Only parse non-html as HTML for attributes that really need it
- Do not log failed Long parsing when size is not specified
- Try to parse dates with RFC822 first before falling back to workarounds for other formats

I ran a benchmark with "Stuff you should know" (for which the workarounds are not needed) containing 2k episodes. Includes download of 8MB of feed XML (~5 seconds), debug build.
Before: 44 seconds, after: 13 seconds ==> 3.4 times faster feed refresh

2 files changed, 8 insertions, 1 deletions

diff --git a/core/src/main/java/de/danoeh/antennapod/core/storage/DBTasks.java b/core/src/main/java/de/danoeh/antennapod/core/storage/DBTasks.java
index 1fb0991dd..883aefee8 100644
--- a/core/src/main/java/de/danoeh/antennapod/core/storage/DBTasks.java
+++ b/core/src/main/java/de/danoeh/antennapod/core/storage/DBTasks.java
@@ -171,6 +171,13 @@ public final class DBTasks {
      * This is to work around podcasters breaking their GUIDs.
      */
     private static FeedItem searchFeedItemGuessDuplicate(List<FeedItem> items, FeedItem searchItem) {
+        // First, see if it is a well-behaving feed that contains an item with the same identifier
+        for (FeedItem item : items) {
+            if (FeedItemDuplicateGuesser.sameAndNotEmpty(item.getItemIdentifier(), searchItem.getItemIdentifier())) {
+                return item;
+            }
+        }
+        // Not found yet, start more expensive guessing
         for (FeedItem item : items) {
             if (FeedItemDuplicateGuesser.seemDuplicates(item, searchItem)) {
                 return item;
diff --git a/core/src/main/java/de/danoeh/antennapod/core/storage/FeedItemDuplicateGuesser.java b/core/src/main/java/de/danoeh/antennapod/core/storage/FeedItemDuplicateGuesser.java
index 88f896187..1eb8b0577 100644
--- a/core/src/main/java/de/danoeh/antennapod/core/storage/FeedItemDuplicateGuesser.java
+++ b/core/src/main/java/de/danoeh/antennapod/core/storage/FeedItemDuplicateGuesser.java
@@ -31,7 +31,7 @@ public class FeedItemDuplicateGuesser {
                 && mimeTypeLooksSimilar(media1, media2);
     }
 
-    private static boolean sameAndNotEmpty(String string1, String string2) {
+    public static boolean sameAndNotEmpty(String string1, String string2) {
         if (TextUtils.isEmpty(string1) || TextUtils.isEmpty(string2)) {
             return false;
         }