spring ServletComponentHandler 源码
springboot ServletComponentHandler 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/ServletComponentHandler.java
/*
* Copyright 2012-2019 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.boot.web.servlet;
import java.lang.annotation.Annotation;
import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.core.type.filter.TypeFilter;
import org.springframework.util.Assert;
/**
* Abstract base class for handlers of Servlet components discovered via classpath
* scanning.
*
* @author Andy Wilkinson
*/
abstract class ServletComponentHandler {
private final Class<? extends Annotation> annotationType;
private final TypeFilter typeFilter;
protected ServletComponentHandler(Class<? extends Annotation> annotationType) {
this.typeFilter = new AnnotationTypeFilter(annotationType);
this.annotationType = annotationType;
}
TypeFilter getTypeFilter() {
return this.typeFilter;
}
protected String[] extractUrlPatterns(Map<String, Object> attributes) {
String[] value = (String[]) attributes.get("value");
String[] urlPatterns = (String[]) attributes.get("urlPatterns");
if (urlPatterns.length > 0) {
Assert.state(value.length == 0, "The urlPatterns and value attributes are mutually exclusive.");
return urlPatterns;
}
return value;
}
protected final Map<String, String> extractInitParameters(Map<String, Object> attributes) {
Map<String, String> initParameters = new HashMap<>();
for (AnnotationAttributes initParam : (AnnotationAttributes[]) attributes.get("initParams")) {
String name = (String) initParam.get("name");
String value = (String) initParam.get("value");
initParameters.put(name, value);
}
return initParameters;
}
void handle(AnnotatedBeanDefinition beanDefinition, BeanDefinitionRegistry registry) {
Map<String, Object> attributes = beanDefinition.getMetadata()
.getAnnotationAttributes(this.annotationType.getName());
if (attributes != null) {
doHandle(attributes, beanDefinition, registry);
}
}
protected abstract void doHandle(Map<String, Object> attributes, AnnotatedBeanDefinition beanDefinition,
BeanDefinitionRegistry registry);
}
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- 本文标签： Spring Boot Java Spring
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