Refactor API calls to use Map.of (Java 9+) and List.copyOf (Java 10+)

Author: miasma

commonmark/src/main/java/org/commonmark/internal/DocumentParser.java

@@ -31,15 +31,7 @@ public class DocumentParser implements ParserState {
     private static final Map<Class<? extends Block>, BlockParserFactory> NODES_TO_CORE_FACTORIES;
 
     static {
-        Map<Class<? extends Block>, BlockParserFactory> map = new HashMap<>();
-        map.put(BlockQuote.class, new BlockQuoteParser.Factory());
-        map.put(Heading.class, new HeadingParser.Factory());
-        map.put(FencedCodeBlock.class, new FencedCodeBlockParser.Factory());
-        map.put(HtmlBlock.class, new HtmlBlockParser.Factory());
-        map.put(ThematicBreak.class, new ThematicBreakParser.Factory());
-        map.put(ListBlock.class, new ListBlockParser.Factory());
-        map.put(IndentedCodeBlock.class, new IndentedCodeBlockParser.Factory());
-        NODES_TO_CORE_FACTORIES = Collections.unmodifiableMap(map);
+        NODES_TO_CORE_FACTORIES = Map.of(BlockQuote.class, new BlockQuoteParser.Factory(), Heading.class, new HeadingParser.Factory(), FencedCodeBlock.class, new FencedCodeBlockParser.Factory(), HtmlBlock.class, new HtmlBlockParser.Factory(), ThematicBreak.class, new ThematicBreakParser.Factory(), ListBlock.class, new ListBlockParser.Factory(), IndentedCodeBlock.class, new IndentedCodeBlockParser.Factory());
     }
 
     private SourceLine line;

commonmark/src/main/java/org/commonmark/internal/LinkReferenceDefinitionParser.java

@@ -104,8 +104,7 @@ State getState() {
     }
 
     List<SourceSpan> removeLines(int lines) {
-        var removedSpans = Collections.unmodifiableList(new ArrayList<>(
-                sourceSpans.subList(Math.max(sourceSpans.size() - lines, 0), sourceSpans.size())));
+        var removedSpans = List.copyOf(sourceSpans.subList(Math.max(sourceSpans.size() - lines, 0), sourceSpans.size()));
         removeLast(lines, paragraphLines);
         removeLast(lines, sourceSpans);
         return removedSpans;