spring WildcardPathElement 源码

spring WildcardPathElement 代码

文件路径：/spring-web/src/main/java/org/springframework/web/util/pattern/WildcardPathElement.java

/*
 * Copyright 2002-2021 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;

import org.springframework.http.server.PathContainer;
import org.springframework.http.server.PathContainer.Element;
import org.springframework.web.util.pattern.PathPattern.MatchingContext;

/**
 * A wildcard path element. In the pattern '/foo/*/goo' the * is
 * represented by a WildcardPathElement. Within a path it matches at least
 * one character but at the end of a path it can match zero characters.
 *
 * @author Andy Clement
 * @since 5.0
 */
class WildcardPathElement extends PathElement {

	public WildcardPathElement(int pos, char separator) {
		super(pos, separator);
	}


	/**
	 * Matching on a WildcardPathElement is quite straight forward. Scan the
	 * candidate from the candidateIndex onwards for the next separator or the end of the
	 * candidate.
	 */
	@Override
	public boolean matches(int pathIndex, MatchingContext matchingContext) {
		String segmentData = null;
		// Assert if it exists it is a segment
		if (pathIndex < matchingContext.pathLength) {
			Element element = matchingContext.pathElements.get(pathIndex);
			if (!(element instanceof PathContainer.PathSegment)) {
				// Should not match a separator
				return false;
			}
			segmentData = ((PathContainer.PathSegment)element).valueToMatch();
			pathIndex++;
		}

		if (isNoMorePattern()) {
			if (matchingContext.determineRemainingPath) {
				matchingContext.remainingPathIndex = pathIndex;
				return true;
			}
			else {
				if (pathIndex == matchingContext.pathLength) {
					// and the path data has run out too
					return true;
				}
				else {
					return (matchingContext.isMatchOptionalTrailingSeparator() &&  // if optional slash is on...
							segmentData != null && segmentData.length() > 0 &&  // and there is at least one character to match the *...
							(pathIndex + 1) == matchingContext.pathLength &&   // and the next path element is the end of the candidate...
							matchingContext.isSeparator(pathIndex));  // and the final element is a separator
				}
			}
		}
		else {
			// Within a path (e.g. /aa/*/bb) there must be at least one character to match the wildcard
			if (segmentData == null || segmentData.length() == 0) {
				return false;
			}
			return (this.next != null && this.next.matches(pathIndex, matchingContext));
		}
	}

	@Override
	public int getNormalizedLength() {
		return 1;
	}

	@Override
	public char[] getChars() {
		return new char[] {'*'};
	}

	@Override
	public int getWildcardCount() {
		return 1;
	}

	@Override
	public int getScore() {
		return WILDCARD_WEIGHT;
	}


	@Override
	public String toString() {
		return "Wildcard(*)";
	}

}

相关信息

spring 源码目录

相关文章

spring CaptureTheRestPathElement 源码

spring CaptureVariablePathElement 源码

spring InternalPathPatternParser 源码

spring LiteralPathElement 源码

spring PathElement 源码

spring PathPattern 源码

spring PathPatternParser 源码

spring PathPatternRouteMatcher 源码

spring PatternParseException 源码

spring RegexPathElement 源码