spring BindingResultUtils 源码
spring BindingResultUtils 代码
文件路径：/spring-context/src/main/java/org/springframework/validation/BindingResultUtils.java
/*
* Copyright 2002-2012 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;
import java.util.Map;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Convenience methods for looking up BindingResults in a model Map.
*
* @author Juergen Hoeller
* @since 2.0
* @see BindingResult#MODEL_KEY_PREFIX
*/
public abstract class BindingResultUtils {
/**
* Find the BindingResult for the given name in the given model.
* @param model the model to search
* @param name the name of the target object to find a BindingResult for
* @return the BindingResult, or {@code null} if none found
* @throws IllegalStateException if the attribute found is not of type BindingResult
*/
@Nullable
public static BindingResult getBindingResult(Map<?, ?> model, String name) {
Assert.notNull(model, "Model map must not be null");
Assert.notNull(name, "Name must not be null");
Object attr = model.get(BindingResult.MODEL_KEY_PREFIX + name);
if (attr != null && !(attr instanceof BindingResult)) {
throw new IllegalStateException("BindingResult attribute is not of type BindingResult: " + attr);
}
return (BindingResult) attr;
}
/**
* Find a required BindingResult for the given name in the given model.
* @param model the model to search
* @param name the name of the target object to find a BindingResult for
* @return the BindingResult (never {@code null})
* @throws IllegalStateException if no BindingResult found
*/
public static BindingResult getRequiredBindingResult(Map<?, ?> model, String name) {
BindingResult bindingResult = getBindingResult(model, name);
if (bindingResult == null) {
throw new IllegalStateException("No BindingResult attribute found for name '" + name +
"'- have you exposed the correct model?");
}
return bindingResult;
}
}
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