spring DefaultBindingErrorProcessor 源码

spring DefaultBindingErrorProcessor 代码

文件路径：/spring-context/src/main/java/org/springframework/validation/DefaultBindingErrorProcessor.java

/*
 * Copyright 2002-2018 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 org.springframework.beans.PropertyAccessException;
import org.springframework.context.support.DefaultMessageSourceResolvable;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;

/**
 * Default {@link BindingErrorProcessor} implementation.
 *
 * <p>Uses the "required" error code and the field name to resolve message codes
 * for a missing field error.
 *
 * <p>Creates a {@code FieldError} for each {@code PropertyAccessException}
 * given, using the {@code PropertyAccessException}'s error code ("typeMismatch",
 * "methodInvocation") for resolving message codes.
 *
 * @author Alef Arendsen
 * @author Juergen Hoeller
 * @since 1.2
 * @see #MISSING_FIELD_ERROR_CODE
 * @see DataBinder#setBindingErrorProcessor
 * @see BeanPropertyBindingResult#addError
 * @see BeanPropertyBindingResult#resolveMessageCodes
 * @see org.springframework.beans.PropertyAccessException#getErrorCode
 * @see org.springframework.beans.TypeMismatchException#ERROR_CODE
 * @see org.springframework.beans.MethodInvocationException#ERROR_CODE
 */
public class DefaultBindingErrorProcessor implements BindingErrorProcessor {

	/**
	 * Error code that a missing field error (i.e. a required field not
	 * found in the list of property values) will be registered with:
	 * "required".
	 */
	public static final String MISSING_FIELD_ERROR_CODE = "required";


	@Override
	public void processMissingFieldError(String missingField, BindingResult bindingResult) {
		// Create field error with code "required".
		String fixedField = bindingResult.getNestedPath() + missingField;
		String[] codes = bindingResult.resolveMessageCodes(MISSING_FIELD_ERROR_CODE, missingField);
		Object[] arguments = getArgumentsForBindError(bindingResult.getObjectName(), fixedField);
		FieldError error = new FieldError(bindingResult.getObjectName(), fixedField, "", true,
				codes, arguments, "Field '" + fixedField + "' is required");
		bindingResult.addError(error);
	}

	@Override
	public void processPropertyAccessException(PropertyAccessException ex, BindingResult bindingResult) {
		// Create field error with the exceptions's code, e.g. "typeMismatch".
		String field = ex.getPropertyName();
		Assert.state(field != null, "No field in exception");
		String[] codes = bindingResult.resolveMessageCodes(ex.getErrorCode(), field);
		Object[] arguments = getArgumentsForBindError(bindingResult.getObjectName(), field);
		Object rejectedValue = ex.getValue();
		if (ObjectUtils.isArray(rejectedValue)) {
			rejectedValue = StringUtils.arrayToCommaDelimitedString(ObjectUtils.toObjectArray(rejectedValue));
		}
		FieldError error = new FieldError(bindingResult.getObjectName(), field, rejectedValue, true,
				codes, arguments, ex.getLocalizedMessage());
		error.wrap(ex);
		bindingResult.addError(error);
	}

	/**
	 * Return FieldError arguments for a binding error on the given field.
	 * Invoked for each missing required field and each type mismatch.
	 * <p>The default implementation returns a single argument indicating the field name
	 * (of type DefaultMessageSourceResolvable, with "objectName.field" and "field" as codes).
	 * @param objectName the name of the target object
	 * @param field the field that caused the binding error
	 * @return the Object array that represents the FieldError arguments
	 * @see org.springframework.validation.FieldError#getArguments
	 * @see org.springframework.context.support.DefaultMessageSourceResolvable
	 */
	protected Object[] getArgumentsForBindError(String objectName, String field) {
		String[] codes = new String[] {objectName + Errors.NESTED_PATH_SEPARATOR + field, field};
		return new Object[] {new DefaultMessageSourceResolvable(codes, field)};
	}

}

相关信息

spring 源码目录

相关文章

spring AbstractBindingResult 源码

spring AbstractErrors 源码

spring AbstractPropertyBindingResult 源码

spring BeanPropertyBindingResult 源码

spring BindException 源码

spring BindingErrorProcessor 源码

spring BindingResult 源码

spring BindingResultUtils 源码

spring DataBinder 源码

spring DefaultMessageCodesResolver 源码