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/*
 * 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); } }





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