spring BindingAwareModelMap 源码
spring BindingAwareModelMap 代码
文件路径：/spring-context/src/main/java/org/springframework/validation/support/BindingAwareModelMap.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.validation.support;
import java.util.Map;
import org.springframework.lang.Nullable;
import org.springframework.ui.ExtendedModelMap;
import org.springframework.validation.BindingResult;
/**
* Subclass of {@link org.springframework.ui.ExtendedModelMap} that automatically removes
* a {@link org.springframework.validation.BindingResult} object if the corresponding
* target attribute gets replaced through regular {@link Map} operations.
*
* <p>This is the class exposed to handler methods by Spring MVC, typically consumed through
* a declaration of the {@link org.springframework.ui.Model} interface. There is no need to
* build it within user code; a plain {@link org.springframework.ui.ModelMap} or even a just
* a regular {@link Map} with String keys will be good enough to return a user model.
*
* @author Juergen Hoeller
* @since 2.5.6
* @see org.springframework.validation.BindingResult
*/
@SuppressWarnings("serial")
public class BindingAwareModelMap extends ExtendedModelMap {
@Override
public Object put(String key, @Nullable Object value) {
removeBindingResultIfNecessary(key, value);
return super.put(key, value);
}
@Override
public void putAll(Map<? extends String, ?> map) {
map.forEach(this::removeBindingResultIfNecessary);
super.putAll(map);
}
private void removeBindingResultIfNecessary(Object key, @Nullable Object value) {
if (key instanceof String attributeName) {
if (!attributeName.startsWith(BindingResult.MODEL_KEY_PREFIX)) {
String bindingResultKey = BindingResult.MODEL_KEY_PREFIX + attributeName;
BindingResult bindingResult = (BindingResult) get(bindingResultKey);
if (bindingResult != null && bindingResult.getTarget() != value) {
remove(bindingResultKey);
}
}
}
}
}
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