/**
 * $Id$
 * $Date$
 *
 */

package org.xmlsh.sh.core;

import java.io.PrintWriter;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.xmlsh.sh.shell.Shell;

public class SubShell extends CompoundCommandExpr {
  private CommandExpr mCommand;
  static Logger mLogger = LogManager.getLogger();

  public SubShell(CommandExpr c) {
    mCommand = c;
    setLocation(c);
  }

  @Override
  public void print(PrintWriter out, boolean bExec) {
    out.print("(");
    mCommand.print(out, bExec);
    out.print(")");
  }

  /*
   * (non-Javadoc)
   * 
   * @see org.xmlsh.sh.core.Command#exec(org.xmlsh.sh.shell.Shell)
   */
  @Override
  public int exec(Shell shell) throws Exception {

    mLogger.entry(shell);
    /*
     * Save the IO environment then redirect before cloning
     * the shell so that port redirections take place in the parent shell
     */
    shell.getEnv().saveIO();
    try {
      applyRedirect(shell);
      // Clone shell to run command inside new shell
      try (Shell subshell = shell.clone()) {
        return mLogger.exit(subshell.exec(mCommand));
      }
    } finally {
      mLogger.trace("Restoring IO after a subshell");
      shell.getEnv().restoreIO();
      mLogger.exit();
    }

  }

  /*
   * (non-Javadoc)
   * 
   * @see org.xmlsh.sh.core.Command#getName()
   */
  @Override
  public String getName() {
    return mCommand.getName();
  }

}
//
//
// Copyright (C) 2008-2014 David A. Lee.
//
// The contents of this file are subject to the "Simplified BSD License" (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.opensource.org/licenses/bsd-license.php
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is David A. Lee
//
// Portions created by (your name) are Copyright (C) (your legal entity). All
// Rights Reserved.
//
// Contributor(s): none.
//