/*
 * #%L
 * T3 :: Web
 * 
 * $Id$
 * $HeadURL$
 * %%
 * Copyright (C) 2010 - 2011 IRD, Codelutin, Tony Chemit
 * %%
 * 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 3 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, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 * #L%
 */
package fr.ird.t3.web.interceptors;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
import fr.ird.t3.TopiaTransactionAware;
import org.nuiton.topia.TopiaContext;

/**
 * A interceptor to close the topia transaction in the action (after the result).
 * <p/>
 * In that way no need to walk inside entities (for lazy problem) and no need
 * also to close the opened transaction.
 *
 * @author tchemit <chemit@codelutin.com>
 * @since 1.0
 */
public class CloseTopiaTransactionInterceptor extends AbstractInterceptor {
    
    private static final long serialVersionUID = 1L;

    @Override
    public String intercept(ActionInvocation invocation) throws Exception {

        TopiaTransactionAware transactionAware = null;

        Object action = invocation.getProxy().getAction();

        if (action instanceof TopiaTransactionAware) {
            transactionAware = (TopiaTransactionAware) action;
        }

        try {
            return invocation.invoke();
        } finally {
            if (transactionAware != null) {

                // we are on a action with a internal topia transaction
                TopiaContext transaction = transactionAware.getTransaction();

                if (transaction != null && !transaction.isClosed()) {

                    // close the transaction opened transaction
                    transaction.closeContext();
                }
            }
        }

    }
}