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

package org.xmlsh.sh.core;

import java.io.PrintWriter;
import org.xmlsh.sh.shell.Shell;

public class IfClause extends CompoundCommandExpr {
  private CommandExpr mIfPart;
  private CommandExpr mThenPart;
  private CommandExpr mElsePart;

  public IfClause(CommandExpr ifPart, CommandExpr thenPart,
      CommandExpr elsePart) {
    super();
    mIfPart = ifPart;
    mThenPart = thenPart;
    mElsePart = elsePart;
    setLocation(ifPart);

  }

  /*
   * (non-Javadoc)
   * 
   * @see org.xmlsh.sh.core.Command#print(java.io.PrintWriter)
   */
  @Override
  public void print(PrintWriter out, boolean bExec) {
    out.print("if ");
    mIfPart.print(out, bExec);
    out.println("; ");
    if(mThenPart != null) {
      out.println("then");
      mThenPart.print(out, bExec);
    }
    if(mElsePart != null) {
      out.println("else");
      mElsePart.print(out, bExec);
    }
    out.println("fi");

  }

  @Override
  public int exec(Shell shell) throws Exception {
    shell.getEnv().saveIO();
    try {
      applyRedirect(shell);

      /*
       * Check condition and execute then part or else part
       * Returns 0 if there is no else part
       */

      int cond = shell.execCondition(mIfPart);
      int ret = 0;
      if(cond == 0 && shell.keepRunning())
        ret = shell.exec(mThenPart);
      else if(mElsePart != null && shell.keepRunning())
        ret = shell.exec(mElsePart);
      return ret;
    } finally {
      shell.getEnv().restoreIO();
    }
  }
}

//
//
// 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.
//