SimpleCommand.java

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

package org.xmlsh.sh.core;

import java.io.PrintWriter;
import java.util.List;

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.xmlsh.core.CommandFactory;
import org.xmlsh.core.ICommand;
import org.xmlsh.core.ThrowException;
import org.xmlsh.core.XValue;
import org.xmlsh.sh.shell.Module;
import org.xmlsh.sh.shell.Shell;
import org.xmlsh.xpath.ShellContext;

public class SimpleCommand extends Command {
	

	private static Logger mLogger = LogManager.getLogger(SimpleCommand.class);
	
	private CommandPrefix  mPrefix;
	private Word			mCommand;
	private CommandSuffix	mSuffix;
	public	boolean		isSimple() { return true ; }

	
	
	public SimpleCommand(CommandPrefix prefix , Word command, CommandSuffix suffix )
	{
		mPrefix = prefix;
		mCommand = command;
		mSuffix = suffix ;
		
	}
	
	

	/* (non-Javadoc)
	 * @see org.xmlsh.sh.core.Command#print(java.io.PrintStream)
	 */
	@Override
	public void print(PrintWriter out, boolean bExec) {
		if( mPrefix != null )
			mPrefix.print(out);
		if( mCommand != null )
			mCommand.print(out);
		
		if( mSuffix  != null ){
			out.print(" ");

			mSuffix.print(out);
		}

	}



	/* (non-Javadoc)
	 * @see org.xmlsh.sh.core.Command#exec(org.xmlsh.core.XEnvironment)
	 */
	@Override
	public int exec(Shell shell) throws Exception {
		
		
		
		if( mCommand == null || mCommand.isEmpty() )
			return execNull( shell );
		
		List<XValue>	cmdLine = mSuffix.toCmdLine(shell, mCommand , getLocation() );
		
		String cmdName = cmdLine.remove(0).toString();
		
		ICommand cmd = CommandFactory.getInstance().getCommand( shell , cmdName , getLocation() );
		
		if( cmd == null ){
			printLoc(shell);
			
			shell.printErr(mCommand + ": not found");
			return 1;
			
		}
		
		
		Shell		   saved_shell = null;
		Module		   saved_module = null;
		
		/*
		 * If there is a prefix then clone the shell, otherwise just clone the IO
		 */
		if( mPrefix == null )
			shell.getEnv().saveIO();
		
		else {
			saved_shell = shell ;
			shell = shell.clone();
			
		}
		
		saved_module = shell.getModule();
		
		Shell saved_context_shell = ShellContext.set( shell );
		try {
		
		
			if( mPrefix != null )
				mPrefix.exec( shell, getLocation() );
			
			
		
			mSuffix.exec( shell, getLocation() );
			
			// Push the current module if its different
			Module module = cmd.getModule();
			if( module != null )
				shell.setModule(module);
			
			return cmd.run(  shell, cmdName , cmdLine );

			
		} 
		catch( ThrowException e )
		{
			cmd.close();
			throw e ;// Rethrow 
		}
		
		catch( Exception e ){

			mLogger.error("Exception running command: " + cmdName  , e );
			printLoc(shell);
			shell.printErr("Exception running: " +  cmdName + "\n" +  e.toString() );

			/*
			 * Save exception here ???? 
			 */

			return -1;
		}
		
		finally {
			ShellContext.set(saved_context_shell);
			
			if( mPrefix == null )
			     shell.getEnv().restoreIO();
			else
			if( saved_shell != null )
				shell.close();
			shell.setModule( saved_module );
		}
		
	}



	private void printLoc(Shell shell) {
		shell.printLoc( mLogger , getLocation() );
	}



	private int execNull(Shell shell) throws Exception {

		int ret = 0;
		if( mPrefix != null )
			ret = mPrefix.exec( shell, getLocation() );
		
		
		if( mSuffix != null )
			mSuffix.exec( shell, getLocation() );
		
		return ret;
	}


	
	
}
//
//
//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.
//