/*
* Copyright 2002-2010 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
*
* http://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.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</code> for each <code>PropertyAccessException</code>
* given, using the <code>PropertyAccessException</code>'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";
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);
bindingResult.addError(new FieldError(
bindingResult.getObjectName(), fixedField, "", true,
codes, arguments, "Field '" + fixedField + "' is required"));
}
public void processPropertyAccessException(PropertyAccessException ex, BindingResult bindingResult) {
// Create field error with the exceptions's code, e.g. "typeMismatch".
String field = ex.getPropertyName();
String[] codes = bindingResult.resolveMessageCodes(ex.getErrorCode(), field);
Object[] arguments = getArgumentsForBindError(bindingResult.getObjectName(), field);
Object rejectedValue = ex.getValue();
if (rejectedValue != null && rejectedValue.getClass().isArray()) {
rejectedValue = StringUtils.arrayToCommaDelimitedString(ObjectUtils.toObjectArray(rejectedValue));
}
bindingResult.addError(new FieldError(
bindingResult.getObjectName(), field, rejectedValue, true,
codes, arguments, ex.getLocalizedMessage()));
}
/**
* 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)};
}
}