spring ChangePathPatternParserVisitor 源码
spring ChangePathPatternParserVisitor 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/function/ChangePathPatternParserVisitor.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.servlet.function;
import java.util.Map;
import java.util.Optional;
import java.util.function.Function;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;
import org.springframework.web.util.pattern.PathPatternParser;
/**
* Implementation of {@link RouterFunctions.Visitor} that changes the
* {@link PathPatternParser} on path-related request predicates
* (i.e. {@code RequestPredicates.PathPatternPredicate}.
*
* @author Arjen Poutsma
* @since 5.3
*/
class ChangePathPatternParserVisitor implements RouterFunctions.Visitor {
private final PathPatternParser parser;
public ChangePathPatternParserVisitor(PathPatternParser parser) {
Assert.notNull(parser, "Parser must not be null");
this.parser = parser;
}
@Override
public void startNested(RequestPredicate predicate) {
changeParser(predicate);
}
@Override
public void endNested(RequestPredicate predicate) {
}
@Override
public void route(RequestPredicate predicate, HandlerFunction<?> handlerFunction) {
changeParser(predicate);
}
@Override
public void resources(Function<ServerRequest, Optional<Resource>> lookupFunction) {
}
@Override
public void attributes(Map<String, Object> attributes) {
}
@Override
public void unknown(RouterFunction<?> routerFunction) {
}
private void changeParser(RequestPredicate predicate) {
if (predicate instanceof Target target) {
target.changeParser(this.parser);
}
}
/**
* Interface implemented by predicates that can change the parser.
*/
public interface Target {
void changeParser(PathPatternParser parser);
}
}
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