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/*
* Copyright 2004-2005 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.springmodules.validation.bean;
import java.lang.reflect.Array;
import java.util.*;
import java.util.Map.Entry;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
import org.springframework.util.StringUtils;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
import org.springmodules.validation.bean.conf.BeanValidationConfiguration;
import org.springmodules.validation.bean.conf.CascadeValidation;
import org.springmodules.validation.bean.conf.loader.BeanValidationConfigurationLoader;
import org.springmodules.validation.bean.conf.loader.xml.DefaultXmlBeanValidationConfigurationLoader;
import org.springmodules.validation.bean.converter.ErrorCodeConverter;
import org.springmodules.validation.bean.converter.ModelAwareErrorCodeConverter;
import org.springmodules.validation.bean.rule.ValidationRule;
import org.springmodules.validation.util.condition.Condition;
/**
* An {@link org.springmodules.validation.validator.AbstractTypeSpecificValidator} implementation that applies all validation rules
* on a bean of a specific type, based on an appropriate {@link org.springmodules.validation.bean.conf.BeanValidationConfiguration}. The validation
* configuration is loaded per bean type by the configured {@link BeanValidationConfigurationLoader}.
*
* @author Uri Boness
*/
public class BeanValidator extends RuleBasedValidator {
private final static Log logger = LogFactory.getLog(BeanValidator.class);
private final static String PROPERTY_KEY_PREFIX = "[";
private final static String PROPERTY_KEY_SUFFIX = "]";
private BeanValidationConfigurationLoader configurationLoader;
private ErrorCodeConverter errorCodeConverter;
/**
* Constructs a new BeanValidator. By default the
* {@link org.springmodules.validation.bean.conf.loader.SimpleBeanValidationConfigurationLoader} is
* used as the bean validation configuration loader.
*/
public BeanValidator() {
this(new DefaultXmlBeanValidationConfigurationLoader());
}
/**
* Constructs a new BeanValidator for the given bean class using the given validation configuration loader.
*
* @param configurationLoader The {@link org.springmodules.validation.bean.conf.loader.BeanValidationConfigurationLoader} that is used to load the bean validation
* configuration.
*/
public BeanValidator(BeanValidationConfigurationLoader configurationLoader) {
this.configurationLoader = configurationLoader;
errorCodeConverter = new ModelAwareErrorCodeConverter();
}
/**
* This validator supports only those classes that are supported by the validation configuration loader it uses.
*
* @see org.springmodules.validation.bean.RuleBasedValidator#supports(Class)
* @see org.springmodules.validation.bean.conf.loader.BeanValidationConfigurationLoader#supports(Class)
*/
public boolean supports(Class clazz) {
return configurationLoader.supports(clazz) || super.supports(clazz);
}
/**
* Applies all validation rules as defined in the {@link org.springmodules.validation.bean.conf.BeanValidationConfiguration} retrieved for the given
* bean from the configured {@link org.springmodules.validation.bean.conf.loader.BeanValidationConfigurationLoader}.
*
* @see Validator#validate(Object, org.springframework.validation.Errors)
*/
public void validate(Object obj, Errors errors) {
// validation the object graph using the class validation manager.
validateObjectGraphConstraints(obj, obj, errors, new HashSet());
// applying the registered validation rules.
super.validate(obj, errors);
}
//============================================== Setter/Getter =====================================================
/**
* Sets the error code converter this validator will use to resolve the error codes to be registered with the
* {@link Errors} object.
*
* @param errorCodeConverter The error code converter this validator will use to resolve the error
* different error codes.
*/
public void setErrorCodeConverter(ErrorCodeConverter errorCodeConverter) {
this.errorCodeConverter = errorCodeConverter;
}
/**
* Sets the bean validation configuration loader this validator will use to load the bean validation configurations.
*
* @param configurationLoader The loader this validator will use to load the bean validation configurations.
*/
public void setConfigurationLoader(BeanValidationConfigurationLoader configurationLoader) {
this.configurationLoader = configurationLoader;
}
//=============================================== Helper Methods ===================================================
/**
* The heart of this validator. This is a recursive method that validates the given object (object) under the
* context of the given object graph root (root). The validation rules to be applied are loaded using the
* configured {@link org.springmodules.validation.bean.conf.loader.BeanValidationConfigurationLoader}. All errors are registered with the given {@link Errors}
* object under the context of the object graph root.
*
* @param root The root of the object graph.
* @param obj The object to be validated
* @param errors The {@link Errors} instance where the validation errors will be registered.
* @param validatedObjects keeps track of all the validated objects (to prevent revalidating the same objects when
* a circular relationship exists).
*/
protected void validateObjectGraphConstraints(Object root, Object obj, Errors errors, Set validatedObjects) {
// cannot load any validation rules for null values
if (obj == null) {
return;
}
// if this object was already validated, the skipping this valiation.
if (validatedObjects.contains(obj)) {
if (logger.isDebugEnabled()) {
logger.debug("Skipping validation of object in path '" + errors.getObjectName() +
"' for it was already validated");
}
return;
}
if (logger.isDebugEnabled()) {
logger.debug("Validating object in path '" + errors.getNestedPath() + "'");
}
// loading the bean validation configuration based on the validated object class.
Class clazz = obj.getClass();
BeanValidationConfiguration configuration = configurationLoader.loadConfiguration(clazz);
if (configuration == null) {
return; // no validation configuration for this object, then there's nothing to validate.
}
// applying all the validation rules for the object and registering the object as "validated"
applyBeanValidation(configuration, obj, errors);
validatedObjects.add(obj);
// after all the validation rules where applied, checking what properties of the object require their own
// validation and recursively calling this method on them.
CascadeValidation[] cascadeValidations = configuration.getCascadeValidations();
BeanWrapper wrapper = wrapBean(obj);
for (int i = 0; i < cascadeValidations.length; i++) {
CascadeValidation cascadeValidation = cascadeValidations[i];
Condition applicabilityCondition = cascadeValidation.getApplicabilityCondition();
if (!applicabilityCondition.check(obj)) {
continue;
}
String propertyName = cascadeValidation.getPropertyName();
Class propertyType = wrapper.getPropertyType(propertyName);
Object propertyValue = wrapper.getPropertyValue(propertyName);
// if the property value is not there nothing to validate.
if (propertyValue == null) {
continue;
}
// if the property is an array of a collection, then iterating on it and validating each element. Note that
// the error codes that are registered for arrays/collection elements follow the pattern supported by
// spring's PropertyAccessor. Also note that just before each recursive call, the context of the validation
// is appropriately adjusted using errors.pushNestedPath(...), and after each call it is being adjusted back
// using errors.popNestedPath().
if (propertyType.isArray()) {
validateArrayProperty(root, propertyValue, propertyName, errors, validatedObjects);
} else if (List.class.isAssignableFrom(propertyType) || Set.class.isAssignableFrom(propertyType)) {
validateListOrSetProperty(root, (Collection) propertyValue, propertyName, errors, validatedObjects);
} else if (Map.class.isAssignableFrom(propertyType)) {
validateMapProperty(root, ((Map) propertyValue), propertyName, errors, validatedObjects);
} else {
// if the object is just a normal object (not an array or a collection), then applying its
// validation rules.
validatedSubBean(root, propertyValue, propertyName, errors, validatedObjects);
}
}
}
/**
* Wraps the given bean in a {@link BeanWrapper}.
*
* @param bean The bean to be wraped.
* @return The bean wrapper that wraps the given bean.
*/
protected BeanWrapper wrapBean(Object bean) {
return new BeanWrapperImpl(bean);
}
/**
* Validates the elements of the given array property.
*
* @param root The root of the object graph that is being validated.
* @param array The given array.
* @param propertyName The name of the array property.
* @param errors The {@link Errors} instance where all validation errors will be registered.
* @param validatedObjects A registry of all objects that were already validated.
*/
protected void validateArrayProperty(
Object root,
Object array,
String propertyName,
Errors errors,
Set validatedObjects) {
for (int i = 0; i < Array.getLength(array); i++) {
String nestedPath = propertyName + PROPERTY_KEY_PREFIX + i + PROPERTY_KEY_SUFFIX;
errors.pushNestedPath(nestedPath);
validateObjectGraphConstraints(root, Array.get(array, i), errors, validatedObjects);
errors.popNestedPath();
}
}
/**
* Validates the elements of the given list or set property.
*
* @param root The root of the object graph that is being validated.
* @param collection The given list or set.
* @param propertyName The name of the array property.
* @param errors The {@link Errors} instance where all validation errors will be registered.
* @param validatedObjects A registry of all objects that were already validated.
*/
protected void validateListOrSetProperty(
Object root,
Collection collection,
String propertyName,
Errors errors,
Set validatedObjects) {
int i = 0;
for (Iterator iter = collection.iterator(); iter.hasNext();) {
Object element = iter.next();
String nestedPath = propertyName + PROPERTY_KEY_PREFIX + i + PROPERTY_KEY_SUFFIX;
errors.pushNestedPath(nestedPath);
validateObjectGraphConstraints(root, element, errors, validatedObjects);
errors.popNestedPath();
i++;
}
}
/**
* Validates the elements within the given map property.
*
* @param root The root of the object graph that is being validated.
* @param map The given map or set.
* @param propertyName The name of the array property.
* @param errors The {@link Errors} instance where all validation errors will be registered.
* @param validatedObjects A registry of all objects that were already validated.
*/
protected void validateMapProperty(Object root, Map map, String propertyName, Errors errors, Set validatedObjects) {
for (Iterator entries = map.entrySet().iterator(); entries.hasNext();) {
Entry entry = (Entry) entries.next();
Object key = entry.getKey();
if (!(key instanceof String)) {
// skipping validation of elements that are mapped to non-string keys for there is no proper
// representation of such elements as property path.
continue;
}
Object value = entry.getValue();
String nestedPath = propertyName + PROPERTY_KEY_PREFIX + String.valueOf(key) + PROPERTY_KEY_SUFFIX;
errors.pushNestedPath(nestedPath);
validateObjectGraphConstraints(root, value, errors, validatedObjects);
errors.popNestedPath();
}
}
/**
* Validates the given nested property bean (sub-bean).
*
* @param root The root of the object graph that is being validated.
* @param subBean The given nested property value (the sub-bean).
* @param propertyName The name of the array property.
* @param errors The {@link Errors} instance where all validation errors will be registered.
* @param validatedObjects A registry of all objects that were already validated.
*/
protected void validatedSubBean(
Object root,
Object subBean,
String propertyName,
Errors errors,
Set validatedObjects) {
errors.pushNestedPath(propertyName);
validateObjectGraphConstraints(root, subBean, errors, validatedObjects);
errors.popNestedPath();
}
/**
* Applying the validation rules listed in the given validation configuration on the given object, and registering
* all validation errors with the given {@link Errors} object.
*
* @param configuration The bean validation configuration that define the validation rules to be applied.
* @param obj The validated object.
* @param errors The {@link Errors} instance where the validation error will be registered.
*/
protected void applyBeanValidation(BeanValidationConfiguration configuration, Object obj, Errors errors) {
if (logger.isDebugEnabled()) {
logger.debug("Validating global rules...");
}
applyGlobalValidationRules(configuration, obj, errors);
if (logger.isDebugEnabled()) {
logger.debug("Validating properties rules...");
}
applyPropertiesValidationRules(configuration, obj, errors);
if (logger.isDebugEnabled()) {
logger.debug("Executing custom validator...");
}
applyCustomValidator(configuration, obj, errors);
}
/**
* Applies the global validation rules as listed in the given validation configuration on the given object, and
* registering all global validation errors with the given {@link Errors}.
*
* @param configuration The bean validation configuration that holds all the global validation rules.
* @param obj The validated object.
* @param errors The {@link Errors} instance where all global validation errors will be registered.
*/
protected void applyGlobalValidationRules(BeanValidationConfiguration configuration, Object obj, Errors errors) {
ValidationRule[] globalRules = configuration.getGlobalRules();
for (int i = 0; i < globalRules.length; i++) {
ValidationRule rule = globalRules[i];
if (rule.isApplicable(obj) && !rule.getCondition().check(obj)) {
String errorCode = errorCodeConverter.convertGlobalErrorCode(rule.getErrorCode(), obj.getClass());
// if there is a nested path in errors, the global errors should be registered as field errors
// for the nested path. Otherwise, they should be registered as global errors. Starting from Spring 2.0-rc2
// this is actually not required - it's just enough to call rejectValue() with null as the field name,
// but we keep this implementation for now to support earlier versions.
if (StringUtils.hasLength(errors.getNestedPath())) {
String nestedPath = errors.getNestedPath();
String propertyName = nestedPath.substring(0, nestedPath.length() - 1);
errors.popNestedPath();
errors.rejectValue(propertyName, errorCode, rule.getErrorArguments(obj), rule.getDefaultErrorMessage());
errors.pushNestedPath(propertyName);
} else {
errors.reject(errorCode, rule.getErrorArguments(obj), rule.getDefaultErrorMessage());
}
}
}
}
/**
* Applies the property validation rules as listed in the given validation configuration on the given object, and
* registering all property validation errors with the given {@link Errors}.
*
* @param configuration The bean validation configuration that holds all the property validation rules.
* @param obj The validated object.
* @param errors The {@link Errors} instance where all property validation errors will be registered
* (see {@link Errors#rejectValue(String, String)}).
*/
protected void applyPropertiesValidationRules(BeanValidationConfiguration configuration, Object obj, Errors errors) {
String[] propertyNames = configuration.getValidatedProperties();
for (int i = 0; i < propertyNames.length; i++) {
String propertyName = propertyNames[i];
if (logger.isDebugEnabled()) {
logger.debug("Validating property '" + propertyName + "' rules...");
}
ValidationRule[] rules = configuration.getPropertyRules(propertyName);
// only allow one error to be associated with a property at once. This is to prevent situations where
// dependent validation rules will fail. An example can be a "minLength()" validation rule that is dependent
// on "notNull()" rule (there is not length to a null value), in this case, if the "notNull()" rule
// produces an error, the "minLength()" rule should not be applied.
validateAndShortCircuitRules(rules, propertyName, obj, errors);
}
}
/**
* Applying the given validation rules on the given property of the given object. The validation stops as soon as
* one of the validation rules produces validation errors. This errors are then registered with the given
* {@link Errors) instance.
*
* @param rules The validation rules that should be applied on the given property of the given object.
* @param propertyName The name of the property to be validated.
* @param obj The validated object.
* @param errors The {@link Errors} instance where the validation errors will be registered.
*/
protected void validateAndShortCircuitRules(ValidationRule[] rules, String propertyName, Object obj, Errors errors) {
for (int i = 0; i < rules.length; i++) {
ValidationRule rule = rules[i];
if (rule.isApplicable(obj) && !rule.getCondition().check(obj)) {
String errorCode = errorCodeConverter.convertPropertyErrorCode(rule.getErrorCode(), obj.getClass(), propertyName);
errors.rejectValue(propertyName, errorCode, rule.getErrorArguments(obj), rule.getDefaultErrorMessage());
return;
}
}
}
/**
* Applies the custom validator of the given configuration (if one exists) on the given object.
*
* @param configuration The configuration from which the custom validator will be taken from.
* @param obj The object to be validated.
* @param errors The {@link Errors} instance where all validation errors will be registered.
*/
protected void applyCustomValidator(BeanValidationConfiguration configuration, Object obj, Errors errors) {
Validator validator = configuration.getCustomValidator();
if (validator != null) {
if (validator.supports(obj.getClass())) {
validator.validate(obj, errors);
}
}
}
}
