Add some documentation and javadocs

Also further simplify CommentRepliesInfo and RelatedItemsInfo

app/src/main/java/org/schabi/newpipe/fragments/list/comments/CommentRepliesFragment.java

@@ -88,7 +88,7 @@ protected Supplier<View> getListHeaderSupplier() {
             // setup author name and comment date
             binding.authorName.setText(item.getUploaderName());
             binding.uploadDate.setText(Localization.relativeTimeOrTextual(
-                    item.getUploadDate(), item.getTextualUploadDate(), getContext()));
+                    getContext(), item.getUploadDate(), item.getTextualUploadDate()));
             binding.authorTouchArea.setOnClickListener(
                     v -> NavigationHelper.openCommentAuthorIfPresent(requireActivity(), item));
 
@@ -139,7 +139,7 @@ public void readFrom(@NonNull final Queue<Object> savedObjects) throws Exception
 
     @Override
     protected Single<CommentRepliesInfo> loadResult(final boolean forceLoad) {
-        return Single.fromCallable(() -> CommentRepliesInfo.getInfo(commentsInfoItem,
+        return Single.fromCallable(() -> new CommentRepliesInfo(commentsInfoItem,
                 // the reply count string will be shown as the activity title
                 Localization.replyCount(requireContext(), commentsInfoItem.getReplyCount())));
     }

app/src/main/java/org/schabi/newpipe/fragments/list/comments/CommentRepliesInfo.java

@@ -7,19 +7,16 @@
 import java.util.Collections;
 
 public final class CommentRepliesInfo extends ListInfo<CommentsInfoItem> {
-    private CommentRepliesInfo(final int serviceId,
-                               final ListLinkHandler listUrlIdHandler,
-                               final String name) {
-        super(serviceId, listUrlIdHandler, name);
-    }
-
-    public static CommentRepliesInfo getInfo(final CommentsInfoItem comment, final String name) {
-        final ListLinkHandler handler =
-                new ListLinkHandler("", "", "", Collections.emptyList(), null);
-        final CommentRepliesInfo relatedItemInfo = new CommentRepliesInfo(
-                comment.getServiceId(), handler, name); // the name will be shown as fragment title
-        relatedItemInfo.setNextPage(comment.getReplies());
-        relatedItemInfo.setRelatedItems(Collections.emptyList()); // since it must be non-null
-        return relatedItemInfo;
+    /**
+     * This class is used to wrap the comment replies page into a ListInfo object.
+     *
+     * @param comment the comment from which to get replies
+     * @param name will be shown as the fragment title
+     */
+    public CommentRepliesInfo(final CommentsInfoItem comment, final String name) {
+        super(comment.getServiceId(),
+                new ListLinkHandler("", "", "", Collections.emptyList(), null), name);
+        setNextPage(comment.getReplies());
+        setRelatedItems(Collections.emptyList()); // since it must be non-null
     }
 }

app/src/main/java/org/schabi/newpipe/fragments/list/videos/RelatedItemsFragment.java

@@ -27,11 +27,11 @@
 
 import io.reactivex.rxjava3.core.Single;
 
-public class RelatedItemsFragment extends BaseListInfoFragment<InfoItem, RelatedItemInfo>
+public class RelatedItemsFragment extends BaseListInfoFragment<InfoItem, RelatedItemsInfo>
         implements SharedPreferences.OnSharedPreferenceChangeListener {
     private static final String INFO_KEY = "related_info_key";
 
-    private RelatedItemInfo relatedItemInfo;
+    private RelatedItemsInfo relatedItemsInfo;
 
     /*//////////////////////////////////////////////////////////////////////////
     // Views
@@ -68,7 +68,7 @@ public void onDestroyView() {
 
     @Override
     protected Supplier<View> getListHeaderSupplier() {
-        if (relatedItemInfo == null || relatedItemInfo.getRelatedItems() == null) {
+        if (relatedItemsInfo == null || relatedItemsInfo.getRelatedItems() == null) {
             return null;
         }
 
@@ -96,8 +96,8 @@ protected Single<ListExtractor.InfoItemsPage<InfoItem>> loadMoreItemsLogic() {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    protected Single<RelatedItemInfo> loadResult(final boolean forceLoad) {
-        return Single.fromCallable(() -> relatedItemInfo);
+    protected Single<RelatedItemsInfo> loadResult(final boolean forceLoad) {
+        return Single.fromCallable(() -> relatedItemsInfo);
     }
 
     @Override
@@ -109,7 +109,7 @@ public void showLoading() {
     }
 
     @Override
-    public void handleResult(@NonNull final RelatedItemInfo result) {
+    public void handleResult(@NonNull final RelatedItemsInfo result) {
         super.handleResult(result);
 
         if (headerBinding != null) {
@@ -136,23 +136,23 @@ public void onCreateOptionsMenu(@NonNull final Menu menu,
 
     private void setInitialData(final StreamInfo info) {
         super.setInitialData(info.getServiceId(), info.getUrl(), info.getName());
-        if (this.relatedItemInfo == null) {
-            this.relatedItemInfo = RelatedItemInfo.getInfo(info);
+        if (this.relatedItemsInfo == null) {
+            this.relatedItemsInfo = new RelatedItemsInfo(info);
         }
     }
 
     @Override
     public void onSaveInstanceState(@NonNull final Bundle outState) {
         super.onSaveInstanceState(outState);
-        outState.putSerializable(INFO_KEY, relatedItemInfo);
+        outState.putSerializable(INFO_KEY, relatedItemsInfo);
     }
 
     @Override
     protected void onRestoreInstanceState(@NonNull final Bundle savedState) {
         super.onRestoreInstanceState(savedState);
         final Serializable serializable = savedState.getSerializable(INFO_KEY);
-        if (serializable instanceof RelatedItemInfo) {
-            this.relatedItemInfo = (RelatedItemInfo) serializable;
+        if (serializable instanceof RelatedItemsInfo) {
+            this.relatedItemsInfo = (RelatedItemsInfo) serializable;
         }
     }
 

app/src/main/java/org/schabi/newpipe/fragments/list/videos/RelatedItemsInfo.java

@@ -0,0 +1,22 @@
+package org.schabi.newpipe.fragments.list.videos;
+
+import org.schabi.newpipe.extractor.InfoItem;
+import org.schabi.newpipe.extractor.ListInfo;
+import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
+import org.schabi.newpipe.extractor.stream.StreamInfo;
+
+import java.util.ArrayList;
+import java.util.Collections;
+
+public final class RelatedItemsInfo extends ListInfo<InfoItem> {
+    /**
+     * This class is used to wrap the related items of a StreamInfo into a ListInfo object.
+     *
+     * @param info the stream info from which to get related items
+     */
+    public RelatedItemsInfo(final StreamInfo info) {
+        super(info.getServiceId(), new ListLinkHandler(info.getOriginalUrl(), info.getUrl(),
+                info.getId(), Collections.emptyList(), null), info.getName());
+        setRelatedItems(new ArrayList<>(info.getRelatedItems()));
+    }
+}

app/src/main/java/org/schabi/newpipe/info_list/holder/CommentInfoItemHolder.java

@@ -118,8 +118,8 @@ public void updateFromItem(final InfoItem infoItem,
         // setup the top row, with pinned icon, author name and comment date
         itemPinnedView.setVisibility(item.isPinned() ? View.VISIBLE : View.GONE);
         itemTitleView.setText(Localization.concatenateStrings(item.getUploaderName(),
-                Localization.relativeTimeOrTextual(item.getUploadDate(),
-                        item.getTextualUploadDate(), itemBuilder.getContext())));
+                Localization.relativeTimeOrTextual(itemBuilder.getContext(), item.getUploadDate(),
+                        item.getTextualUploadDate())));
 
 
         // setup bottom row, with likes, heart and replies button

app/src/main/java/org/schabi/newpipe/info_list/holder/StreamInfoItemHolder.java

@@ -77,8 +77,9 @@ private String getStreamInfoDetailLine(final StreamInfoItem infoItem) {
             }
         }
 
-        final String uploadDate = Localization.relativeTimeOrTextual(infoItem.getUploadDate(),
-                infoItem.getTextualUploadDate(), itemBuilder.getContext());
+        final String uploadDate = Localization.relativeTimeOrTextual(itemBuilder.getContext(),
+                infoItem.getUploadDate(),
+                infoItem.getTextualUploadDate());
         if (!TextUtils.isEmpty(uploadDate)) {
             if (viewsAndDate.isEmpty()) {
                 return uploadDate;

app/src/main/java/org/schabi/newpipe/util/Localization.java

@@ -215,6 +215,12 @@ public static String replyCount(final Context context, final int replyCount) {
                 String.valueOf(replyCount));
     }
 
+    /**
+     * @param context the Android context
+     * @param likeCount the like count, possibly negative if unknown
+     * @return if {@code likeCount} is smaller than {@code 0}, the string {@code "-"}, otherwise
+     *         the result of calling {@link #shortCount(Context, long)} on the like count
+     */
     public static String likeCount(final Context context, final int likeCount) {
         if (likeCount < 0) {
             return "-";
@@ -296,9 +302,20 @@ public static String relativeTime(final OffsetDateTime offsetDateTime) {
         return prettyTime.formatUnrounded(offsetDateTime);
     }
 
-    public static String relativeTimeOrTextual(final DateWrapper parsed,
-                                               final String textual,
-                                               @Nullable final Context context) {
+    /**
+     * @param context the Android context; if {@code null} then even if in debug mode and the
+     *                setting is enabled, {@code textual} will not be shown next to {@code parsed}
+     * @param parsed  the textual date or time ago parsed by NewPipeExtractor, or {@code null} if
+     *                the extractor could not parse it
+     * @param textual the original textual date or time ago string as provided by services
+     * @return {@link #relativeTime(OffsetDateTime)} is used if {@code parsed != null}, otherwise
+     *         {@code textual} is returned. If in debug mode, {@code context != null},
+     *         {@code parsed != null} and the relevant setting is enabled, {@code textual} will
+     *         be appended to the returned string for debugging purposes.
+     */
+    public static String relativeTimeOrTextual(@Nullable final Context context,
+                                               @Nullable final DateWrapper parsed,
+                                               final String textual) {
         if (parsed == null) {
             return textual;
         } else if (DEBUG && context != null && PreferenceManager

app/src/main/java/org/schabi/newpipe/util/NavigationHelper.java

@@ -482,6 +482,13 @@ public static void openChannelFragment(@NonNull final Fragment fragment,
                 item.getServiceId(), uploaderUrl, item.getUploaderName());
     }
 
+    /**
+     * Opens the comment author channel fragment, if the {@link CommentsInfoItem#getUploaderUrl()}
+     * of {@code comment} is non-null. Shows a UI-error snackbar if something goes wrong.
+     *
+     * @param activity the activity with the fragment manager and in which to show the snackbar
+     * @param comment the comment whose uploader/author will be opened
+     */
     public static void openCommentAuthorIfPresent(@NonNull final FragmentActivity activity,
                                                   final CommentsInfoItem comment) {
         if (isEmpty(comment.getUploaderUrl())) {

app/src/main/java/org/schabi/newpipe/util/ServiceHelper.java

@@ -144,6 +144,11 @@ public static String getNameOfServiceById(final int serviceId) {
                 .orElse("<unknown>");
     }
 
+    /**
+     * @param serviceId the id of the service
+     * @return the service corresponding to the provided id
+     * @throws java.util.NoSuchElementException if there is no service with the provided id
+     */
     @NonNull
     public static StreamingService getServiceById(final int serviceId) {
         return ServiceList.all().stream()