/*
* Copyright 2002-2010 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.web.bind.support;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.validation.BindException;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.multipart.MultipartRequest;
/**
* Special {@link org.springframework.validation.DataBinder} to perform data binding
* from web request parameters to JavaBeans, including support for multipart files.
*
* <p>See the DataBinder/WebDataBinder superclasses for customization options,
* which include specifying allowed/required fields, and registering custom
* property editors.
*
* <p>Can also used for manual data binding in custom web controllers or interceptors
* that build on Spring's {@link org.springframework.web.context.request.WebRequest}
* abstraction: e.g. in a {@link org.springframework.web.context.request.WebRequestInterceptor}
* implementation. Simply instantiate a WebRequestDataBinder for each binding
* process, and invoke <code>bind</code> with the current WebRequest as argument:
*
* <pre class="code">
* MyBean myBean = new MyBean();
* // apply binder to custom target object
* WebRequestDataBinder binder = new WebRequestDataBinder(myBean);
* // register custom editors, if desired
* binder.registerCustomEditor(...);
* // trigger actual binding of request parameters
* binder.bind(request);
* // optionally evaluate binding errors
* Errors errors = binder.getErrors();
* ...</pre>
*
* @author Juergen Hoeller
* @since 2.5.2
* @see #bind(org.springframework.web.context.request.WebRequest)
* @see #registerCustomEditor
* @see #setAllowedFields
* @see #setRequiredFields
* @see #setFieldMarkerPrefix
*/
public class WebRequestDataBinder extends WebDataBinder {
/**
* Create a new WebRequestDataBinder instance, with default object name.
* @param target the target object to bind onto (or <code>null</code>
* if the binder is just used to convert a plain parameter value)
* @see #DEFAULT_OBJECT_NAME
*/
public WebRequestDataBinder(Object target) {
super(target);
}
/**
* Create a new WebRequestDataBinder instance.
* @param target the target object to bind onto (or <code>null</code>
* if the binder is just used to convert a plain parameter value)
* @param objectName the name of the target object
*/
public WebRequestDataBinder(Object target, String objectName) {
super(target, objectName);
}
/**
* Bind the parameters of the given request to this binder's target,
* also binding multipart files in case of a multipart request.
* <p>This call can create field errors, representing basic binding
* errors like a required field (code "required"), or type mismatch
* between value and bean property (code "typeMismatch").
* <p>Multipart files are bound via their parameter name, just like normal
* HTTP parameters: i.e. "uploadedFile" to an "uploadedFile" bean property,
* invoking a "setUploadedFile" setter method.
* <p>The type of the target property for a multipart file can be MultipartFile,
* byte[], or String. The latter two receive the contents of the uploaded file;
* all metadata like original file name, content type, etc are lost in those cases.
* @param request request with parameters to bind (can be multipart)
* @see org.springframework.web.multipart.MultipartRequest
* @see org.springframework.web.multipart.MultipartFile
* @see #bindMultipartFiles
* @see #bind(org.springframework.beans.PropertyValues)
*/
public void bind(WebRequest request) {
MutablePropertyValues mpvs = new MutablePropertyValues(request.getParameterMap());
if (request instanceof NativeWebRequest) {
MultipartRequest multipartRequest = ((NativeWebRequest) request).getNativeRequest(MultipartRequest.class);
if (multipartRequest != null) {
bindMultipart(multipartRequest.getMultiFileMap(), mpvs);
}
}
doBind(mpvs);
}
/**
* Treats errors as fatal.
* <p>Use this method only if it's an error if the input isn't valid.
* This might be appropriate if all input is from dropdowns, for example.
* @throws BindException if binding errors have been encountered
*/
public void closeNoCatch() throws BindException {
if (getBindingResult().hasErrors()) {
throw new BindException(getBindingResult());
}
}
}
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