Reduce warnings in WhatWgUrlParser

spring-web/src/main/java/org/springframework/web/util/WhatWgUrlParser.java

@@ -57,6 +57,7 @@
  * @author Arjen Poutsma
  * @since 6.2
  */
+@SuppressWarnings({"SameParameterValue", "BooleanMethodIsAlwaysInverted"})
 final class WhatWgUrlParser {
 
 	public static final UrlRecord EMPTY_RECORD = new UrlRecord();
@@ -140,7 +141,7 @@ public static UrlRecord parse(String input, @Nullable UrlRecord base,
 	/**
 	 * The basic URL parser takes a scalar value string input, with an optional
 	 * null or base URL base (default null), an optional encoding (default UTF-8),
-	 * an optional UrlRecord, and an optional state override.
+	 * and optionally, a UrlRecord and/or State overrides to start from.
 	 */
 	private UrlRecord basicUrlParser(@Nullable UrlRecord url, @Nullable State stateOverride) {
 		// If url is not given:
@@ -471,6 +472,7 @@ private static boolean isNonCharacter(int ch) {
 				ch == 0xEFFFE || ch == 0xEFFFF || ch == 0xFFFFE || ch == 0xFFFFF || ch == 0x10FFFE || ch == 0x10FFFF);
 	}
 
+	@SuppressWarnings("BooleanMethodIsAlwaysInverted")
 	private static boolean isUrlCodePoint(int ch) {
 		return (isAsciiAlphaNumeric(ch) ||
 				ch == '!' || ch == '$' || ch == '&' || ch == '\'' || ch == '(' || ch == ')' ||
@@ -490,10 +492,8 @@ private static int defaultPort(@Nullable String scheme) {
 		if (scheme != null) {
 			return switch (scheme) {
 				case "ftp" -> 21;
-				case "http" -> 80;
-				case "https" -> 443;
-				case "ws" -> 80;
-				case "wss" -> 443;
+				case "http", "ws" -> 80;
+				case "https", "wss" -> 443;
 				default -> -1;
 			};
 		}
@@ -686,10 +686,9 @@ private static boolean isDoubleDotPathSegment(StringBuilder b) {
 
 	/**
 	 * A Windows drive letter is two code points, of which the first is an ASCII alpha
-	 * and the second is either U+003A (:) or U+007C (|).
-	 *
+	 * and the second is either U+003A {@code (:)} or U+007C {@code (|)}.
 	 * A normalized Windows drive letter is a Windows drive letter of which
-	 * the second code point is U+003A (:).
+	 * the second code point is U+003A {@code (:)}.
 	 */
 	private static boolean isWindowsDriveLetter(CharSequence input, boolean normalized) {
 		if (input.length() != 2) {
@@ -699,8 +698,7 @@ private static boolean isWindowsDriveLetter(CharSequence input, boolean normaliz
 	}
 
 	/**
-	 * A string starts with a Windows drive letter if all of the following are true:
-	 *
+	 * A string starts with a Windows drive letter if all the following are true:
 	 * its length is greater than or equal to 2
 	 * its first two code points are a Windows drive letter
 	 * its length is 2 or its third code point is U+002F (/), U+005C (\), U+003F (?), or U+0023 (#).
@@ -1204,7 +1202,6 @@ else if (p.stateOverride != null && p.buffer.isEmpty() &&
 					// If state override is given, then return.
 					if (p.stateOverride != null) {
 						p.stopMainLoop = true;
-						return;
 					}
 				}
 				// Otherwise:
@@ -1656,7 +1653,7 @@ public void handle(int c, UrlRecord url, WhatWgUrlParser p) {
 					}
 				}
 				// Otherwise, if c is not the EOF code point:
-				else if (c != EOF) {
+				else {
 					if (p.validate()) {
 						// If c is not a URL code point and not U+0025 (%), invalid-URL-unit validation error.
 						if (!isUrlCodePoint(c) && c != '%') {
@@ -1769,39 +1766,6 @@ public boolean hasOpaquePath() {
 		}
 
 
-		/**
-		 * The serialization of an origin is the string obtained by applying
-		 * the following algorithm to the given origin:
-		 * <ol>
-		 * <li>If origin is an opaque origin, then return "null".
-		 * <li>Otherwise, let result be origin's scheme.
-		 * <li>Append "://" to result.
-		 * Append origin's host, serialized, to result.
-		 * <li>If origin's port is non-null, append a U+003A COLON character (:),
-		 * and origin's port, serialized, to result.
-		 * <li>Return result.
-		 * </ol>
-		 */
-		public String origin() {
-			String scheme = scheme();
-			if (scheme.equals("ftp") ||
-					scheme.equals("http") || scheme.equals("https") ||
-					scheme.equals("ws") || scheme.equals("wss")) {
-				StringBuilder builder = new StringBuilder(scheme);
-				builder.append("://");
-				builder.append(host());
-				Port port = port();
-				if (port != null) {
-					builder.append(':');
-					builder.append(port);
-				}
-				return builder.toString();
-			}
-			else {
-				return "null";
-			}
-		}
-
 		/**
 		 * A URL’s scheme is an ASCII string that identifies the type of URL and
 		 * can be used to dispatch a URL for further processing after parsing.
@@ -1814,6 +1778,7 @@ public String scheme() {
 		/**
 		 * The protocol getter steps are to return this’s URL’s scheme, followed by U+003A (:).
 		 */
+		@SuppressWarnings("unused")
 		public String protocol() {
 			return scheme() + ":";
 		}
@@ -1899,6 +1864,7 @@ public Host host() {
 		 * <li>Return url’s host, serialized, followed by U+003A (:) and url’s port, serialized.
 		 * </ol>
 		 */
+		@SuppressWarnings("unused")
 		public String hostString() {
 			if (host() == null) {
 				return "";
@@ -2001,6 +1967,7 @@ public String fragment() {
 		 * <li>Return U+0023 (#), followed by this’s URL’s fragment.
 		 * </ol>
 		 */
+		@SuppressWarnings("unused")
 		public String hash() {
 			String fragment = fragment();
 			return (fragment != null && !fragment.isEmpty() ? "#" + fragment : "");
@@ -2248,6 +2215,7 @@ static final class IpAddressHost implements Host {
 			}
 		}
 
+		@SuppressWarnings("unused")
 		public IpAddress address() {
 			return this.address;
 		}
@@ -2776,7 +2744,7 @@ else if (c != EOF) {
 			}
 			// Otherwise, if compress is null and pieceIndex is not 8,
 			// IPv6-too-few-pieces validation error, return failure.
-			else if (compress == null && pieceIndex != 8) {
+			else if (pieceIndex != 8) {
 				throw new InvalidUrlException("An uncompressed IPv6 address contains fewer than 8 pieces.");
 			}
 			// Return address.
@@ -3019,6 +2987,7 @@ public boolean isOpaque() {
 			return true;
 		}
 
+		@SuppressWarnings("MethodDoesntCallSuperMethod")
 		@Override
 		public Path clone() {
 			return new PathSegment(segment());
@@ -3103,6 +3072,7 @@ public boolean isOpaque() {
 			return false;
 		}
 
+		@SuppressWarnings("MethodDoesntCallSuperMethod")
 		@Override
 		public Path clone() {
 			return new PathSegments(this.segments);