/*
 * $Id: ValidateActionForm.java 471754 2006-11-06 14:55:09Z husted $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.struts.chain.commands.servlet;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.chain.commands.AbstractValidateActionForm;
import org.apache.struts.chain.contexts.ActionContext;
import org.apache.struts.chain.contexts.ServletActionContext;
import org.apache.struts.config.ActionConfig;

/**
 * <p>Validate the properties of the form bean for this request.  If there are
 * any validation errors, execute the child commands in our chain; otherwise,
 * proceed normally.  Also, if any errors are found and the request is a
 * multipart request, rollback the <code>MultipartRequestHandler</code>.</p>
 *
 * @version $Rev: 471754 $ $Date: 2005-06-04 10:58:46 -0400 (Sat, 04 Jun 2005)
 *          $
 */
public class ValidateActionForm extends AbstractValidateActionForm {

    // ------------------------------------------------------ Instance Variables

    private static final Log LOG = LogFactory.getLog(ValidateActionForm.class);

    // ------------------------------------------------------- Protected Methods

    /**
     * <p>Call the <code>validate()</code> method of the specified form bean,
     * and return the resulting <code>ActionErrors</code> object.</p>
     *
     * @param context    The context for this request
     * @param actionForm The form bean for this request
     */
    @Override
    protected ActionErrors validate(final ActionContext<String, Object> context,
            final ActionConfig actionConfig, final ActionForm actionForm) {
        ServletActionContext saContext = (ServletActionContext) context;
        ActionErrors errors = null;
        if (ActionMapping.class.isInstance(actionConfig)) {
            errors = actionForm.validate((ActionMapping) actionConfig, saContext.getRequest());
        }

        // Special handling for multipart request
        if ((errors != null) && !errors.isEmpty()) {
            if (actionForm.getMultipartRequestHandler() != null) {
                if (LOG.isTraceEnabled()) {
                    LOG.trace("  Rolling back multipart request");
                }
                actionForm.getMultipartRequestHandler().rollback();
            }
        }

        return errors;
    }
}
