001    /*
002     * Copyright (C) 2010 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    package org.crsh.shell.impl;
020    
021    import org.crsh.shell.ErrorType;
022    import org.crsh.shell.ShellProcess;
023    import org.crsh.shell.ShellProcessContext;
024    import org.crsh.shell.ShellResponse;
025    
026    /**
027     * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
028     */
029    abstract class CRaSHProcess implements ShellProcess {
030    
031      /** . */
032      protected final CRaSH crash;
033    
034      /** . */
035      protected final String request;
036    
037      protected CRaSHProcess(CRaSH crash, String request) {
038        this.crash = crash;
039        this.request = request;
040      }
041    
042      public void execute(ShellProcessContext processContext) {
043        ShellResponse resp;
044        try {
045          resp = invoke(processContext);
046        } catch (Throwable t) {
047          resp = new ShellResponse.Error(ErrorType.INTERNAL, t);
048        }
049    
050        //
051        processContext.end(resp);
052    
053        //
054        if (resp instanceof ShellResponse.Error) {
055          ShellResponse.Error error = (ShellResponse.Error)resp;
056          Throwable t = error.getThrowable();
057          if (t != null) {
058            crash.log.error("Error while evaluating request '" + request + "' " + error.getText(), t);
059          } else {
060            crash.log.error("Error while evaluating request '" + request + "' " + error.getText());
061          }
062        }
063      }
064    
065      abstract ShellResponse invoke(ShellProcessContext context);
066    
067      public void cancel() {
068        // No op
069      }
070    }