spring AttributesTestVisitor 源码
spring AttributesTestVisitor 代码
文件路径：/spring-webmvc/src/test/java/org/springframework/web/servlet/function/AttributesTestVisitor.java
/*
* Copyright 2002-2022 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.Deque;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.springframework.core.io.Resource;
import org.springframework.lang.Nullable;
/**
* @author Arjen Poutsma
*/
class AttributesTestVisitor implements RouterFunctions.Visitor {
private Deque<Map<String, Object>> nestedAttributes = new LinkedList<>();
@Nullable
private Map<String, Object> attributes;
private List<List<Map<String, Object>>> routerFunctionsAttributes = new LinkedList<>();
private int visitCount;
public List<List<Map<String, Object>>> routerFunctionsAttributes() {
return this.routerFunctionsAttributes;
}
public int visitCount() {
return this.visitCount;
}
@Override
public void startNested(RequestPredicate predicate) {
nestedAttributes.addFirst(attributes);
attributes = null;
}
@Override
public void endNested(RequestPredicate predicate) {
attributes = nestedAttributes.removeFirst();
}
@Override
public void route(RequestPredicate predicate, HandlerFunction<?> handlerFunction) {
Stream<Map<String, Object>> current = Optional.ofNullable(attributes).stream();
Stream<Map<String, Object>> nested = nestedAttributes.stream().filter(Objects::nonNull);
routerFunctionsAttributes.add(Stream.concat(current, nested).collect(Collectors.toUnmodifiableList()));
attributes = null;
}
@Override
public void resources(Function<ServerRequest, Optional<Resource>> lookupFunction) {
}
@Override
public void attributes(Map<String, Object> attributes) {
this.attributes = attributes;
this.visitCount++;
}
@Override
public void unknown(RouterFunction<?> routerFunction) {
}
}
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