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/*
 * Copyright 2002-2006 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.springframework.validation;

import java.io.Serializable;

import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
import org.springframework.beans.ConfigurablePropertyAccessor;
import org.springframework.util.Assert;

/**
 * Default implementation of the {@link Errors} and {@link BindingResult}
 * interfaces, for the registration and evaluation of binding errors on
 * JavaBean objects.
 * 
 * 

Performs standard JavaBean property access, also supporting nested * properties. Normally, application code will work with the * Errors interface or the BindingResult interface. * A {@link DataBinder} returns its BindingResult via * {@link org.springframework.validation.DataBinder#getBindingResult()}. * * @author Juergen Hoeller * @since 2.0 * @see DataBinder#getBindingResult() * @see DataBinder#initBeanPropertyAccess() * @see DirectFieldBindingResult */ public class BeanPropertyBindingResult extends AbstractPropertyBindingResult implements Serializable { private final Object target; private transient BeanWrapper beanWrapper; /** * Creates a new instance of the {@link BeanPropertyBindingResult} class. * @param target the target bean to bind onto * @param objectName the name of the target object * @throws IllegalArgumentException if the supplied target is null */ public BeanPropertyBindingResult(Object target, String objectName) { super(objectName); Assert.notNull(target, "Target bean must not be null"); this.target = target; } public final Object getTarget() { return this.target; } /** * Returns the {@link BeanWrapper} that this instance uses. * Creates a new one if none existed before. * @see #createBeanWrapper() */ public final ConfigurablePropertyAccessor getPropertyAccessor() { if (this.beanWrapper == null) { this.beanWrapper = createBeanWrapper(); this.beanWrapper.setExtractOldValueForEditor(true); } return this.beanWrapper; } /** * Create a new {@link BeanWrapper} for the underlying target object. * @see #getTarget() */ protected BeanWrapper createBeanWrapper() { return new BeanWrapperImpl(getTarget()); } }





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