/* ===================================================================
 * UserRegistrationIndexInterceptor.java
 * 
 * Created Mar 8, 2005 4:26:16 PM
 * 
 * Copyright (c) 2005 Matt Magoffin (spamsqr@msqr.us)
 * 
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU General Public License as 
 * published by the Free Software Foundation; either version 2 of 
 * the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
 * 02111-1307 USA
 * ===================================================================
 * $Id: UserArgumentIndexInterceptor.java 4 2009-05-01 03:27:53Z msqr $
 * ===================================================================
 */

package magoffin.matt.ieat.aop;

import java.lang.reflect.Method;

import magoffin.matt.ieat.dao.UserDao;
import magoffin.matt.ieat.domain.User;

import org.springframework.aop.AfterReturningAdvice;

/**
 * Interceptor to support automatic indexing of updated User domain objects
 * via their login name.
 * 
 * <p>This interceptor expects a <code>User</code> method parameter 
 * passed to the {@link #afterReturning(Object, Method, Object[], Object)} 
 * method to exist for a user that needs to be indexed. This method will 
 * then either use the <code>userId</code> of that user instance (if it is 
 * set) or use the <code>login</code> value to find the userId for the user 
 * and then call the  
 * {@link magoffin.matt.ieat.biz.RecipeSearchIndexBiz#indexUser(Integer)}
 * method to index the user.</p>
 * 
 * <p>The configurable properties of this class are (in addition to those of 
 * {@link magoffin.matt.ieat.aop.AbstractIndexInterceptor}):</p>
 * 
 * <dl>
 *   <dt>userDao</dt>
 *   <dd>The {@link magoffin.matt.ieat.dao.UserDao} instance to use to 
 *   find User objects by the <code>login</code> property.</dd>
 * </dl>
 * 
 * @see magoffin.matt.ieat.aop.AbstractIndexInterceptor
 * @author Matt Magoffin (spamsqr@msqr.us)
 * @version $Revision: 4 $ $Date: 2009-05-01 15:27:53 +1200 (Fri, 01 May 2009) $
 */
public class UserArgumentIndexInterceptor extends AbstractIndexInterceptor 
implements AfterReturningAdvice {
	
	/* Injected fields. */
	
	private UserDao userDao;

	/* (non-Javadoc)
	 * @see org.springframework.aop.AfterReturningAdvice#afterReturning(java.lang.Object, java.lang.reflect.Method, java.lang.Object[], java.lang.Object)
	 */
	public void afterReturning(Object returnValue, Method method,
			Object[] args, Object target) throws Throwable {
		// assume one parameter is the User to index
		User user = null;
		for ( int i = 0; i < args.length && user == null; i++ ) {
			if ( args[i] instanceof User ) {
				user = (User)args[i];
			}
		}
		
		if ( user == null ) {
			throw new RuntimeException("User not available in method arguments");
		}
		
		Integer userId = user.getUserId();
		if ( userId == null ) {
			if ( user.getLogin() != null ) {
				String login = user.getLogin();
				user = userDao.getUser(login);
				if ( user == null ) {
					throw new RuntimeException("User not found for login '" +login +"'");
				}
				userId = user.getUserId();
			} else {
				throw new RuntimeException("No userId or login available on User instance");
			}
		}
		
		getRecipeSearchIndexBiz().indexUser(userId);
	}
	
	/**
	 * @return the userDao
	 */
	public UserDao getUserDao() {
		return userDao;
	}
	
	/**
	 * @param userDao the userDao to set
	 */
	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}

}
