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org.springframework.boot.context.properties.bind.validation.ValidationBindHandler Maven / Gradle / Ivy
/*
* Copyright 2012-2019 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.boot.context.properties.bind.validation;
import java.util.Arrays;
import java.util.Deque;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.Set;
import java.util.stream.Collectors;
import org.springframework.boot.context.properties.bind.AbstractBindHandler;
import org.springframework.boot.context.properties.bind.BindContext;
import org.springframework.boot.context.properties.bind.BindHandler;
import org.springframework.boot.context.properties.bind.Bindable;
import org.springframework.boot.context.properties.source.ConfigurationProperty;
import org.springframework.boot.context.properties.source.ConfigurationPropertyName;
import org.springframework.validation.BeanPropertyBindingResult;
import org.springframework.validation.BindingResult;
import org.springframework.validation.Validator;
/**
* {@link BindHandler} to apply {@link Validator Validators} to bound results.
*
* @author Phillip Webb
* @author Madhura Bhave
* @since 2.0.0
*/
public class ValidationBindHandler extends AbstractBindHandler {
private final Validator[] validators;
private final Set boundProperties = new LinkedHashSet<>();
private final Deque exceptions = new LinkedList<>();
public ValidationBindHandler(Validator... validators) {
this.validators = validators;
}
public ValidationBindHandler(BindHandler parent, Validator... validators) {
super(parent);
this.validators = validators;
}
@Override
public Object onSuccess(ConfigurationPropertyName name, Bindable target,
BindContext context, Object result) {
if (context.getConfigurationProperty() != null) {
this.boundProperties.add(context.getConfigurationProperty());
}
return super.onSuccess(name, target, context, result);
}
@Override
public void onFinish(ConfigurationPropertyName name, Bindable target,
BindContext context, Object result) throws Exception {
validate(name, target, context, result);
super.onFinish(name, target, context, result);
}
@Override
public Object onFailure(ConfigurationPropertyName name, Bindable target,
BindContext context, Exception error) throws Exception {
Object result = super.onFailure(name, target, context, error);
validate(name, target, context, null);
return result;
}
private void validate(ConfigurationPropertyName name, Bindable target,
BindContext context, Object result) {
Object validationTarget = getValidationTarget(target, context, result);
Class validationType = target.getBoxedType().resolve();
if (validationTarget != null) {
validateAndPush(name, validationTarget, validationType);
}
if (context.getDepth() == 0 && !this.exceptions.isEmpty()) {
throw this.exceptions.pop();
}
}
private Object getValidationTarget(Bindable target, BindContext context,
Object result) {
if (result != null) {
return result;
}
if (context.getDepth() == 0 && target.getValue() != null) {
return target.getValue().get();
}
return null;
}
private void validateAndPush(ConfigurationPropertyName name, Object target,
Class type) {
BindingResult errors = new BeanPropertyBindingResult(target, name.toString());
Arrays.stream(this.validators).filter((validator) -> validator.supports(type))
.forEach((validator) -> validator.validate(target, errors));
if (errors.hasErrors()) {
this.exceptions.push(getBindValidationException(name, errors));
}
}
private BindValidationException getBindValidationException(
ConfigurationPropertyName name, BindingResult errors) {
Set boundProperties = this.boundProperties.stream()
.filter((property) -> name.isAncestorOf(property.getName()))
.collect(Collectors.toCollection(LinkedHashSet::new));
ValidationErrors validationErrors = new ValidationErrors(name, boundProperties,
errors.getAllErrors());
return new BindValidationException(validationErrors);
}
}