/* 
 *  Copyright (C) 2000 - 2008 TagServlet Ltd
 *
 *  This file is part of Open BlueDragon (OpenBD) CFML Server Engine.
 *  
 *  OpenBD is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  Free Software Foundation,version 3.
 *  
 *  OpenBD is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with OpenBD.  If not, see http://www.gnu.org/licenses/
 *  
 *  Additional permission under GNU GPL version 3 section 7
 *  
 *  If you modify this Program, or any covered work, by linking or combining 
 *  it with any of the JARS listed in the README.txt (or a modified version of 
 *  (that library), containing parts covered by the terms of that JAR, the 
 *  licensors of this Program grant you additional permission to convey the 
 *  resulting work. 
 *  README.txt @ http://www.openbluedragon.org/license/README.txt
 *  
 *  http://www.openbluedragon.org/
 */

package com.naryx.tagfusion.expression.function;

import java.util.List;

import com.nary.util.string;
import com.naryx.tagfusion.cfm.engine.cfArgStructData;
import com.naryx.tagfusion.cfm.engine.cfData;
import com.naryx.tagfusion.cfm.engine.cfSession;
import com.naryx.tagfusion.cfm.engine.cfStringData;
import com.naryx.tagfusion.cfm.engine.cfmRunTimeException;

public class getToken extends functionBase {
  
  private static final long serialVersionUID = 1L;
	
  public getToken(){  
  	min = 2; max = 3;
  	setNamedParams( new String[]{ "string", "position", "delimiters" } );
  }
  
	public String[] getParamInfo(){
		return new String[]{
			"string",
			"position",
			"delimiters - default comma (,)"
		};
	}
	
	public java.util.Map getInfo(){
		return makeInfo(
				"string", 
				"Returns the token at the given position", 
				ReturnType.STRING );
	}
	
	public cfData execute(cfSession _session, cfArgStructData argStruct ) throws cfmRunTimeException {
		
		String substring = getNamedStringParam(argStruct, "string", "");
		String delimitors = getNamedStringParam(argStruct, "delimiters", null);
		int start = getInt( _session, getNamedParam( argStruct, "position" ));
		
  	if ( start < 1 )
    	throwException( _session, "invalid start position" );

		List<String> tokens;
		
		if ( delimitors == null )
			tokens = string.split( substring );
		else
			tokens = string.split( substring, delimitors );
    
    for ( int i = 0; i < tokens.size(); i++ ){
    	if ( i+1 == start )
    		return new cfStringData( tokens.get(i).toString() );
    }
    
    return new cfStringData("");
  } 
}