spring DefaultDataBinderFactory 源码
spring DefaultDataBinderFactory 代码
文件路径：/spring-web/src/main/java/org/springframework/web/bind/support/DefaultDataBinderFactory.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.web.bind.support;
import org.springframework.lang.Nullable;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.context.request.NativeWebRequest;
/**
* Create a {@link WebRequestDataBinder} instance and initialize it with a
* {@link WebBindingInitializer}.
*
* @author Rossen Stoyanchev
* @since 3.1
*/
public class DefaultDataBinderFactory implements WebDataBinderFactory {
@Nullable
private final WebBindingInitializer initializer;
/**
* Create a new {@code DefaultDataBinderFactory} instance.
* @param initializer for global data binder initialization
* (or {@code null} if none)
*/
public DefaultDataBinderFactory(@Nullable WebBindingInitializer initializer) {
this.initializer = initializer;
}
/**
* Create a new {@link WebDataBinder} for the given target object and
* initialize it through a {@link WebBindingInitializer}.
* @throws Exception in case of invalid state or arguments
*/
@Override
public final WebDataBinder createBinder(
NativeWebRequest webRequest, @Nullable Object target, String objectName) throws Exception {
WebDataBinder dataBinder = createBinderInstance(target, objectName, webRequest);
if (this.initializer != null) {
this.initializer.initBinder(dataBinder);
}
initBinder(dataBinder, webRequest);
return dataBinder;
}
/**
* Extension point to create the WebDataBinder instance.
* By default this is {@code WebRequestDataBinder}.
* @param target the binding target or {@code null} for type conversion only
* @param objectName the binding target object name
* @param webRequest the current request
* @throws Exception in case of invalid state or arguments
*/
protected WebDataBinder createBinderInstance(
@Nullable Object target, String objectName, NativeWebRequest webRequest) throws Exception {
return new WebRequestDataBinder(target, objectName);
}
/**
* Extension point to further initialize the created data binder instance
* (e.g. with {@code @InitBinder} methods) after "global" initialization
* via {@link WebBindingInitializer}.
* @param dataBinder the data binder instance to customize
* @param webRequest the current request
* @throws Exception if initialization fails
*/
protected void initBinder(WebDataBinder dataBinder, NativeWebRequest webRequest)
throws Exception {
}
}
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