Remove PathPatternComparator

Direct comparison of a pattern (as a String) to the path does not make
much sense now that we deal with URL encoding through PathContainer
which exposes (safely) decoded path segments.

Removing the PathPatternComparator also means we can keep patterns
pre-sorted instead of sorting them all the time. That probably offsets
any benefits from comparing to the lookup path for direct matches and
patterns are still sorted according to specificity.

spring-web/src/main/java/org/springframework/web/util/pattern/PathPatternComparator.java

@@ -1,72 +0,0 @@
-/*
- * Copyright 2002-2017 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.web.util.pattern;
-
-import java.util.Comparator;
-
-import org.springframework.lang.Nullable;
-
-/**
- * {@link PathPattern} comparator that takes account of a specified
- * path and sorts anything that exactly matches it to be first.
- *
- * <p>Patterns that have the same specificity are then compared
- * using their String representation, in order to avoid
- * considering them as "duplicates" when sorting them
- * in {@link java.util.Set} collections.
- *
- * @author Brian Clozel
- * @since 5.0
- */
-public class PathPatternComparator implements Comparator<PathPattern> {
-
-	private final String path;
-
-
-	public PathPatternComparator(String path) {
-		this.path = path;
-	}
-
-
-	@Override
-	public int compare(@Nullable PathPattern o1, @Nullable PathPattern o2) {
-		// Nulls get sorted to the end
-		if (o1 == null) {
-			return (o2 == null ? 0 : +1);
-		}
-		else if (o2 == null) {
-			return -1;
-		}
-
-		// exact matches get sorted first
-		if (o1.getPatternString().equals(path)) {
-			return (o2.getPatternString().equals(path)) ? 0 : -1;
-		}
-		else if (o2.getPatternString().equals(path)) {
-			return +1;
-		}
-
-		// compare pattern specificity
-		int result = o1.compareTo(o2);
-		// if equal specificity, sort using pattern string
-		if (result == 0) {
-			return o1.getPatternString().compareTo(o2.getPatternString());
-		}
-		return result;
-	}
-
-}