org.exoplatform.frameworks.jcr.web.CommandControllerServlet.java Source code

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Here is the source code for org.exoplatform.frameworks.jcr.web.CommandControllerServlet.java

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/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.exoplatform.frameworks.jcr.web;

import org.apache.commons.chain.Command;
import org.exoplatform.container.ExoContainer;
import org.exoplatform.container.PortalContainer;
import org.exoplatform.frameworks.jcr.command.web.GenericWebAppContext;
import org.exoplatform.services.command.impl.CommandService;
import org.exoplatform.services.jcr.RepositoryService;
import org.exoplatform.services.jcr.config.RepositoryConfigurationException;
import org.exoplatform.services.jcr.ext.app.SessionProviderService;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.services.log.Log;

import java.io.IOException;

import javax.jcr.RepositoryException;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Created by The eXo Platform SAS .
 * 
 * @author <a href="mailto:gennady.azarenkov@exoplatform.com">Gennady Azarenkov</a>
 * @version $Id: CommandControllerServlet.java 14756 2008-05-26 14:47:15Z pnedonosko $
 */

@SuppressWarnings("serial")
public class CommandControllerServlet extends HttpServlet {

    private static Log log = ExoLogger.getLogger("exo.jcr.framework.command.CommandControllerServlet");

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        ServletContext servletCtx = getServletContext();
        ExoContainer container = (ExoContainer) servletCtx.getAttribute(WebConstants.EXO_CONTAINER);
        final ClassLoader currentClassLoader = Thread.currentThread().getContextClassLoader();
        boolean hasChanged = false;
        ClassLoader pcClassLoader = null;
        if (container == null) {
            container = PortalContainer.getCurrentInstance(servletCtx);
            if (container instanceof PortalContainer) {
                PortalContainer pc = (PortalContainer) container;
                pcClassLoader = pc.getPortalClassLoader();
                servletCtx = pc.getPortalContext();
            }
        }

        SessionProviderService sessionProviderService = (SessionProviderService) container
                .getComponentInstanceOfType(SessionProviderService.class);

        RepositoryService repositoryService = (RepositoryService) container
                .getComponentInstanceOfType(RepositoryService.class);

        GenericWebAppContext ctx;
        try {
            ctx = new GenericWebAppContext(servletCtx, request, response,
                    sessionProviderService.getSessionProvider(null), // null for
                    // ThreadLocalSessionProvider
                    repositoryService.getDefaultRepository());
        } catch (final RepositoryException e) {
            throw new IOException() {
                @Override
                public Throwable getCause() {
                    return e;
                }
            };
        } catch (final RepositoryConfigurationException e) {
            throw new IOException() {
                @Override
                public Throwable getCause() {
                    return e;
                }
            };
        }

        CommandService commandService = (CommandService) container.getComponentInstanceOfType(CommandService.class);
        String catalogName = (String) ctx.get(WebConstants.CATALOG_NAME);

        // command from context
        String commandName = (String) ctx.get("Command");
        if (commandName == null)
            throw new ServletException("No Command found at the Context");
        Command cmd;
        if (catalogName == null)
            cmd = commandService.getCatalog().getCommand(commandName);
        else
            cmd = commandService.getCatalog(catalogName).getCommand(commandName);

        if (cmd == null)
            throw new ServletException("No Command found " + commandName);
        try {
            if (pcClassLoader != null) {
                // Set the portal classloader to get all the resources defined within the portal context
                Thread.currentThread().setContextClassLoader(pcClassLoader);
                hasChanged = true;
            }
            cmd.execute(ctx);
        } catch (Exception e) {
            log.error("An error occurs while executing the command " + commandName, e);
            throw new ServletException(e);
        } finally {
            if (hasChanged) {
                // Re-set the old classloader
                Thread.currentThread().setContextClassLoader(currentClassLoader);
            }
        }
    }

}