spring ToStringVisitor 源码

spring ToStringVisitor 代码

文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/function/ToStringVisitor.java

/*
 * Copyright 2002-2019 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.Set;
import java.util.function.Function;

import org.springframework.core.io.Resource;
import org.springframework.http.HttpMethod;

/**
 * Implementation of {@link RouterFunctions.Visitor} that creates a formatted
 * string representation of router functions.
 *
 * @author Arjen Poutsma
 * @since 5.2
 */
class ToStringVisitor implements RouterFunctions.Visitor, RequestPredicates.Visitor {

	private final StringBuilder builder = new StringBuilder();

	private int indent = 0;


	// RouterFunctions.Visitor

	@Override
	public void startNested(RequestPredicate predicate) {
		indent();
		predicate.accept(this);
		this.builder.append(" => {\n");
		this.indent++;
	}

	@Override
	public void endNested(RequestPredicate predicate) {
		this.indent--;
		indent();
		this.builder.append("}\n");
	}

	@Override
	public void route(RequestPredicate predicate, HandlerFunction<?> handlerFunction) {
		indent();
		predicate.accept(this);
		this.builder.append(" -> ");
		this.builder.append(handlerFunction).append('\n');
	}

	@Override
	public void resources(Function<ServerRequest, Optional<Resource>> lookupFunction) {
		indent();
		this.builder.append(lookupFunction).append('\n');
	}

	@Override
	public void attributes(Map<String, Object> attributes) {
	}

	@Override
	public void unknown(RouterFunction<?> routerFunction) {
		indent();
		this.builder.append(routerFunction);
	}

	private void indent() {
		for (int i = 0; i < this.indent; i++) {
			this.builder.append(' ');
		}
	}


	// RequestPredicates.Visitor

	@Override
	public void method(Set<HttpMethod> methods) {
		if (methods.size() == 1) {
			this.builder.append(methods.iterator().next());
		}
		else {
			this.builder.append(methods);
		}
	}

	@Override
	public void path(String pattern) {
		this.builder.append(pattern);
	}

	@Override
	public void pathExtension(String extension) {
		this.builder.append(String.format("*.%s", extension));
	}

	@Override
	public void header(String name, String value) {
		this.builder.append(String.format("%s: %s", name, value));
	}

	@Override
	public void param(String name, String value) {
		this.builder.append(String.format("?%s == %s", name, value));
	}

	@Override
	public void startAnd() {
		this.builder.append('(');
	}

	@Override
	public void and() {
		this.builder.append(" && ");
	}

	@Override
	public void endAnd() {
		this.builder.append(')');
	}

	@Override
	public void startOr() {
		this.builder.append('(');
	}

	@Override
	public void or() {
		this.builder.append(" || ");

	}

	@Override
	public void endOr() {
		this.builder.append(')');
	}

	@Override
	public void startNegate() {
		this.builder.append("!(");
	}

	@Override
	public void endNegate() {
		this.builder.append(')');
	}

	@Override
	public void unknown(RequestPredicate predicate) {
		this.builder.append(predicate);
	}

	@Override
	public String toString() {
		String result = this.builder.toString();
		if (result.endsWith("\n")) {
			result = result.substring(0, result.length() - 1);
		}
		return result;
	}

}

相关信息

spring 源码目录

相关文章

spring AbstractServerResponse 源码

spring AsyncServerResponse 源码

spring ChangePathPatternParserVisitor 源码

spring DefaultAsyncServerResponse 源码

spring DefaultEntityResponseBuilder 源码

spring DefaultRenderingResponseBuilder 源码

spring DefaultServerRequest 源码

spring DefaultServerRequestBuilder 源码

spring DefaultServerResponseBuilder 源码

spring EntityResponse 源码