org.springframework.validation.SimpleErrors Maven / Gradle / Ivy
/*
* Copyright 2002-2023 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.beans.PropertyDescriptor;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.BeanUtils;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.StringUtils;
/**
* A simple implementation of the {@link Errors} interface, managing global
* errors and field errors for a top-level target object. Flexibly retrieves
* field values through bean property getter methods, and automatically
* falls back to raw field access if necessary.
*
* Note that this {@link Errors} implementation comes without support for
* nested paths. It is exclusively designed for the validation of individual
* top-level objects, not aggregating errors from multiple sources.
* If this is insufficient for your purposes, use a binding-capable
* {@link Errors} implementation such as {@link BeanPropertyBindingResult}.
*
* @author Juergen Hoeller
* @since 6.1
* @see Validator#validateObject(Object)
* @see BeanPropertyBindingResult
* @see DirectFieldBindingResult
*/
@SuppressWarnings("serial")
public class SimpleErrors implements Errors, Serializable {
private final Object target;
private final String objectName;
private final List globalErrors = new ArrayList<>();
private final List fieldErrors = new ArrayList<>();
/**
* Create a new {@link SimpleErrors} holder for the given target,
* using the simple name of the target class as the object name.
* @param target the target to wrap
*/
public SimpleErrors(Object target) {
Assert.notNull(target, "Target must not be null");
this.target = target;
this.objectName = this.target.getClass().getSimpleName();
}
/**
* Create a new {@link SimpleErrors} holder for the given target.
* @param target the target to wrap
* @param objectName the name of the target object for error reporting
*/
public SimpleErrors(Object target, String objectName) {
Assert.notNull(target, "Target must not be null");
this.target = target;
this.objectName = objectName;
}
@Override
public String getObjectName() {
return this.objectName;
}
@Override
public void reject(String errorCode, @Nullable Object[] errorArgs, @Nullable String defaultMessage) {
this.globalErrors.add(new ObjectError(getObjectName(), new String[] {errorCode}, errorArgs, defaultMessage));
}
@Override
public void rejectValue(@Nullable String field, String errorCode,
@Nullable Object[] errorArgs, @Nullable String defaultMessage) {
if (!StringUtils.hasLength(field)) {
reject(errorCode, errorArgs, defaultMessage);
return;
}
Object newVal = getFieldValue(field);
this.fieldErrors.add(new FieldError(getObjectName(), field, newVal, false,
new String[] {errorCode}, errorArgs, defaultMessage));
}
@Override
public void addAllErrors(Errors errors) {
this.globalErrors.addAll(errors.getGlobalErrors());
this.fieldErrors.addAll(errors.getFieldErrors());
}
@Override
public List getGlobalErrors() {
return this.globalErrors;
}
@Override
public List getFieldErrors() {
return this.fieldErrors;
}
@Override
@Nullable
public Object getFieldValue(String field) {
FieldError fieldError = getFieldError(field);
if (fieldError != null) {
return fieldError.getRejectedValue();
}
PropertyDescriptor pd = BeanUtils.getPropertyDescriptor(this.target.getClass(), field);
if (pd != null && pd.getReadMethod() != null) {
ReflectionUtils.makeAccessible(pd.getReadMethod());
return ReflectionUtils.invokeMethod(pd.getReadMethod(), this.target);
}
Field rawField = ReflectionUtils.findField(this.target.getClass(), field);
if (rawField != null) {
ReflectionUtils.makeAccessible(rawField);
return ReflectionUtils.getField(rawField, this.target);
}
throw new IllegalArgumentException("Cannot retrieve value for field '" + field +
"' - neither a getter method nor a raw field found");
}
@Override
public Class getFieldType(String field) {
PropertyDescriptor pd = BeanUtils.getPropertyDescriptor(this.target.getClass(), field);
if (pd != null) {
return pd.getPropertyType();
}
Field rawField = ReflectionUtils.findField(this.target.getClass(), field);
if (rawField != null) {
return rawField.getType();
}
return null;
}
@Override
public boolean equals(@Nullable Object other) {
return (this == other || (other instanceof SimpleErrors that &&
ObjectUtils.nullSafeEquals(this.target, that.target) &&
this.globalErrors.equals(that.globalErrors) &&
this.fieldErrors.equals(that.fieldErrors)));
}
@Override
public int hashCode() {
return this.target.hashCode();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
for (ObjectError error : this.globalErrors) {
sb.append('\n').append(error);
}
for (ObjectError error : this.fieldErrors) {
sb.append('\n').append(error);
}
return sb.toString();
}
}