org.springframework.validation.DirectFieldBindingResult Maven / Gradle / Ivy
/*
* 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.ConfigurablePropertyAccessor;
import org.springframework.beans.PropertyAccessorFactory;
import org.springframework.lang.Nullable;
/**
* Special implementation of the Errors and BindingResult interfaces,
* supporting registration and evaluation of binding errors on value objects.
* Performs direct field access instead of going through JavaBean getters.
*
* Since Spring 4.1 this implementation is able to traverse nested fields.
*
* @author Juergen Hoeller
* @since 2.0
* @see DataBinder#getBindingResult()
* @see DataBinder#initDirectFieldAccess()
* @see BeanPropertyBindingResult
*/
@SuppressWarnings("serial")
public class DirectFieldBindingResult extends AbstractPropertyBindingResult {
@Nullable
private final Object target;
private final boolean autoGrowNestedPaths;
@Nullable
private transient ConfigurablePropertyAccessor directFieldAccessor;
/**
* Create a new DirectFieldBindingResult instance.
* @param target the target object to bind onto
* @param objectName the name of the target object
*/
public DirectFieldBindingResult(@Nullable Object target, String objectName) {
this(target, objectName, true);
}
/**
* Create a new DirectFieldBindingResult instance.
* @param target the target object to bind onto
* @param objectName the name of the target object
* @param autoGrowNestedPaths whether to "auto-grow" a nested path that contains a null value
*/
public DirectFieldBindingResult(@Nullable Object target, String objectName, boolean autoGrowNestedPaths) {
super(objectName);
this.target = target;
this.autoGrowNestedPaths = autoGrowNestedPaths;
}
@Override
@Nullable
public final Object getTarget() {
return this.target;
}
/**
* Returns the DirectFieldAccessor that this instance uses.
* Creates a new one if none existed before.
* @see #createDirectFieldAccessor()
*/
@Override
public final ConfigurablePropertyAccessor getPropertyAccessor() {
if (this.directFieldAccessor == null) {
this.directFieldAccessor = createDirectFieldAccessor();
this.directFieldAccessor.setExtractOldValueForEditor(true);
this.directFieldAccessor.setAutoGrowNestedPaths(this.autoGrowNestedPaths);
}
return this.directFieldAccessor;
}
/**
* Create a new DirectFieldAccessor for the underlying target object.
* @see #getTarget()
*/
protected ConfigurablePropertyAccessor createDirectFieldAccessor() {
if (this.target == null) {
throw new IllegalStateException("Cannot access fields on null target instance '" + getObjectName() + "'");
}
return PropertyAccessorFactory.forDirectFieldAccess(this.target);
}
}