Remove unused package-private class o.s.w.u.p.SubSequence

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

-/*
- * 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
- *
- *      https://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;
-
-/**
- * Used to represent a subsection of an array, useful when wanting to pass that subset of data
- * to another method (e.g. a java regex matcher) but not wanting to create a new string object
- * to hold all that data.
- *
- * @author Andy Clement
- * @since 5.0
- */
-class SubSequence implements CharSequence {
-
-	private final char[] chars;
-
-	private final int start;
-
-	private final int end;
-
-
-	SubSequence(char[] chars, int start, int end) {
-		this.chars = chars;
-		this.start = start;
-		this.end = end;
-	}
-
-
-	@Override
-	public int length() {
-		return (this.end - this.start);
-	}
-
-	@Override
-	public char charAt(int index) {
-		return this.chars[this.start + index];
-	}
-
-	@Override
-	public CharSequence subSequence(int start, int end) {
-		return new SubSequence(this.chars, this.start + start, this.start + end);
-	}
-
-
-	@Override
-	public String toString() {
-		return new String(this.chars, this.start, this.end - this.start);
-	}
-
-}