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HandlerMappingIntrospector.getHandlerMappings() never returns null

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This commit is contained in:
Juergen Hoeller
2017-10-12 15:31:11 +02:00
parent 2e0a2845ab
commit d611486978
1 changed files with 42 additions and 41 deletions
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83
spring-webmvc/src/main/java/org/springframework/web/servlet/handler/HandlerMappingIntrospector.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2016 the original author or authors.
* Copyright 2002-2017 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.
@@ -90,7 +90,7 @@ public class HandlerMappingIntrospector
* Return the configured HandlerMapping's.
*/
public List<HandlerMapping> getHandlerMappings() {
return this.handlerMappings;
return (this.handlerMappings != null ? this.handlerMappings : Collections.emptyList());
}
@@ -107,44 +107,6 @@ public class HandlerMappingIntrospector
}
}
private static List<HandlerMapping> initHandlerMappings(ApplicationContext applicationContext) {
Map<String, HandlerMapping> beans = BeanFactoryUtils.beansOfTypeIncludingAncestors(
applicationContext, HandlerMapping.class, true, false);
if (!beans.isEmpty()) {
List<HandlerMapping> mappings = new ArrayList<>(beans.values());
AnnotationAwareOrderComparator.sort(mappings);
return Collections.unmodifiableList(mappings);
}
return Collections.unmodifiableList(initFallback(applicationContext));
}
private static List<HandlerMapping> initFallback(ApplicationContext applicationContext) {
Properties props;
String path = "DispatcherServlet.properties";
try {
Resource resource = new ClassPathResource(path, DispatcherServlet.class);
props = PropertiesLoaderUtils.loadProperties(resource);
}
catch (IOException ex) {
throw new IllegalStateException("Could not load '" + path + "': " + ex.getMessage());
}
String value = props.getProperty(HandlerMapping.class.getName());
String[] names = StringUtils.commaDelimitedListToStringArray(value);
List<HandlerMapping> result = new ArrayList<>(names.length);
for (String name : names) {
try {
Class<?> clazz = ClassUtils.forName(name, DispatcherServlet.class.getClassLoader());
Object mapping = applicationContext.getAutowireCapableBeanFactory().createBean(clazz);
result.add((HandlerMapping) mapping);
}
catch (ClassNotFoundException ex) {
throw new IllegalStateException("Could not find default HandlerMapping [" + name + "]");
}
}
return result;
}
/**
* Find the {@link HandlerMapping} that would handle the given request and
@@ -204,6 +166,45 @@ public class HandlerMappingIntrospector
}
private static List<HandlerMapping> initHandlerMappings(ApplicationContext applicationContext) {
Map<String, HandlerMapping> beans = BeanFactoryUtils.beansOfTypeIncludingAncestors(
applicationContext, HandlerMapping.class, true, false);
if (!beans.isEmpty()) {
List<HandlerMapping> mappings = new ArrayList<>(beans.values());
AnnotationAwareOrderComparator.sort(mappings);
return Collections.unmodifiableList(mappings);
}
return Collections.unmodifiableList(initFallback(applicationContext));
}
private static List<HandlerMapping> initFallback(ApplicationContext applicationContext) {
Properties props;
String path = "DispatcherServlet.properties";
try {
Resource resource = new ClassPathResource(path, DispatcherServlet.class);
props = PropertiesLoaderUtils.loadProperties(resource);
}
catch (IOException ex) {
throw new IllegalStateException("Could not load '" + path + "': " + ex.getMessage());
}
String value = props.getProperty(HandlerMapping.class.getName());
String[] names = StringUtils.commaDelimitedListToStringArray(value);
List<HandlerMapping> result = new ArrayList<>(names.length);
for (String name : names) {
try {
Class<?> clazz = ClassUtils.forName(name, DispatcherServlet.class.getClassLoader());
Object mapping = applicationContext.getAutowireCapableBeanFactory().createBean(clazz);
result.add((HandlerMapping) mapping);
}
catch (ClassNotFoundException ex) {
throw new IllegalStateException("Could not find default HandlerMapping [" + name + "]");
}
}
return result;
}
/**
* Request wrapper that ignores request attribute changes.
*/
@@ -215,7 +216,7 @@ public class HandlerMappingIntrospector
@Override
public void setAttribute(String name, Object value) {
// Ignore attribute change
// Ignore attribute change...
}
}