package com.ice.syslogd;

import com.ice.syslog.SyslogDefs;
import com.ice.util.StringUtilities;

import java.lang.*;
import java.text.*;
import java.util.*;


/**
 * The ConfigFormat class implements the code necessary
 * to format and parse syslog configuration entries.
 *
 * @version $Revision: 1.1.1.1 $
 * @author Timothy Gerard Endres,
 *   <a href="mailto:time@ice.com">time@ice.com.
 * @see SyslogServer
 */

public class
ConfigFormat extends Format
	{																
	public static final String		RCS_ID = "$Id: ConfigFormat.java,v 1.1.1.1 1998/02/22 05:47:54 time Exp $";
	public static final String		RCS_REV = "$Revision: 1.1.1.1 $";
	public static final String		RCS_NAME = "$Name:  $";

	static public final char		configSeparator = '.';
	static public final String		paramSeparator = " \t";
	static public final String		facilitySeparator = ",";


    static public final ConfigFormat
	getInstance()
		{
		return new ConfigFormat();
		}

	public
	ConfigFormat()
		{
		super();
		}

	public String
	format( ConfigEntry entry )
		throws IllegalArgumentException
		{
		StringBuffer result =
			new StringBuffer();

		result.append
			( "UNIMPLEMENTED: ConfigFormat.format( ConfigEntry )" );

		return result.toString();
		}

	public StringBuffer
	format( Object entry, StringBuffer appendTo, FieldPosition fieldPos )
		throws IllegalArgumentException
		{
		// UNDONE - handle fieldPos!
		String tmpFormat = this.format( (ConfigEntry)entry );
		appendTo.append( tmpFormat );
		return appendTo;
		}

	public ConfigEntry
	parse( String source )
		throws ParseException
		{
		return this.parseEntry( source );
		}

	public Object
	parseObject( String source, ParsePosition pos )
		{
		ConfigEntry entry = null;

		try {
			entry = this.parseEntry( source );
			}
		catch ( ParseException ex )
			{
			entry = null;
			}

		return (Object) entry;
		}

	// UNDONE - all the positions in ParseExceptions are zero.

	public ConfigEntry
	parseEntry( String source )  
		throws ParseException
		{
		String			entryStr = source;
		String			facilityStr = null;
		String			priorityStr = null;
		String			actionStr = null;
		String			matchStr = null;
		String			parameterStr = null;
		String[]		params = null;
		int				index, tabIdx, slashIdx;
		int				facility, priority;
		int				tokeCount;
		StringTokenizer	toker;

		boolean hasMatch = false;

		index = entryStr.indexOf( ConfigFormat.configSeparator );
		if ( index < 0 )
			{
			throw new ParseException
				( "configuration entry has no facility field", 0 );
			}

		facilityStr = entryStr.substring( 0, index );
		entryStr = entryStr.substring( index + 1 );

		index = entryStr.indexOf( ConfigFormat.configSeparator );
		if ( index < 0 )
			{
			throw new ParseException
				( "configuration entry has no priority field", 0 );
			}

		priorityStr = entryStr.substring( 0, index );
		entryStr = entryStr.substring( index + 1 );

		index = entryStr.indexOf( ' ' );
		tabIdx = entryStr.indexOf( '\t' );
		slashIdx = entryStr.indexOf( '/' );

		if ( slashIdx > 0
				&& ( index < 0 || slashIdx < index )
				&& ( tabIdx < 0 || slashIdx < tabIdx ) )
			{
			// We have a regeular expression to match...
			actionStr = entryStr.substring( 0, slashIdx );
			entryStr = entryStr.substring( slashIdx + 1 );
			slashIdx = entryStr.indexOf( '/' );
			if ( slashIdx < 0 )
				{
				throw new ParseException
					( "configuration entry has bad match expression", 0 );
				}
			else
				{
				hasMatch = true;
				matchStr = entryStr.substring( 0, slashIdx );
				if ( (slashIdx + 1) < entryStr.length() )
					parameterStr = entryStr.substring( slashIdx + 1 );
				else
					parameterStr = null;
				}
			}
		else if ( index < 0 && tabIdx < 0 )
			{
			actionStr = entryStr;
			parameterStr = null;
			}
		else
			{
			if ( tabIdx >= 0 && tabIdx < index )
				index = tabIdx;
			actionStr = entryStr.substring( 0, index );
			parameterStr = entryStr.substring( index + 1 );
			}

		if ( parameterStr != null )
			{
			params =
				com.ice.util.StringUtilities.parseArgumentString
					( parameterStr );
			}

		ConfigEntry result = new ConfigEntry();

		SyslogAction action =
			new SyslogAction( actionStr, params );

		result.setAction( action );

		if ( hasMatch )
			{
			result.setMatchExpr( matchStr );
			}

		if ( priorityStr.equals( "*" ) )
			{
			priority = SyslogDefs.LOG_ALL;
			}
		else
			{
			priority = SyslogDefs.getPriority( priorityStr );
			}

		for ( int i = 0 ; i < SyslogDefs.LOG_NFACILITIES ; ++i )
			{
			result.setFacilityLevel( i, -1 ); // UNDONE !!!
			}

		if ( facilityStr.equals( "*" ) )
			{
			for ( int i = 0 ; i < SyslogDefs.LOG_NFACILITIES ; ++i )
				{
				result.setFacilityLevel( i, priority );
				}
			}
		else
			{
			toker = new StringTokenizer
						( facilityStr, ConfigFormat.facilitySeparator );

			tokeCount = toker.countTokens();

			if ( tokeCount > 0 )
				{
				for ( int pIdx = 0 ; pIdx < tokeCount ; ++pIdx )
					{
					String facilityName = null;

					try { facilityName = toker.nextToken(); }
						catch ( NoSuchElementException ex )
							{ break; }

					facility = SyslogDefs.getFacility( facilityName );

					result.setFacilityLevel( facility, priority );
					}
				}
			}

		return result;
		}

	}