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/****************************************************************************** 
 * The contents of this file are subject to the   Compiere License  Version 1.1 
 * ("License"); You may not use this file except in compliance with the License 
 * You may obtain a copy of the License at http://www.compiere.org/license.html 
 * 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                  Compiere  ERP & CRM  Business Solution 
 * The Initial Developer of the Original Code is Jorg Janke  and ComPiere, Inc. 
 * Portions created by Jorg Janke are Copyright (C) 1999-2001 Jorg Janke, parts 
 * created by ComPiere are Copyright (C) ComPiere, Inc.;   All Rights Reserved. 
 * Contributor(s): ______________________________________. 
 *****************************************************************************/ 
package org.compiere.model; 
 
import java.util.*; 
 
/** 
 *  Callout Interface for Callout. 
 *  Used in MTab and ImpFormatRow 
 * 
 *  @author     Jorg Janke 
 *  @version    $Id: Callout.java,v 1.3 2002/08/12 01:55:12 danb Exp $ 
 */ 
public interface Callout 
{ 
	/** 
	 *	Start Callout. 
	 *  
 
	 *	Callout's are used for cross field validation and setting values in other fields 
	 *	when returning a non empty (error message) string, an exception is raised 
	 *  
 
	 *	When invoked, the Tab model has the new value! 
	 * 
	 *  @param ctx      Context 
	 *  @param method   Method name 
	 *  @param WindowNo current Window No 
	 *  @param mTab     Model Tab 
	 *  @param mField   Model Field 
	 *  @param value    The new value 
	 *  @param oldValue The old value 
	 *  @return Error message or "" 
	 */ 
	public String start (Properties ctx, String method, int WindowNo, 
		MTab mTab, MField mField, Object value, Object oldValue); 
 
	/** 
	 *	Conversion Rules. 
	 *	Convert a String 
	 * 
	 *	@param method   in notation User_Function 
	 *  @param value    the value 
	 *	@return converted String or Null if no method found 
	 */ 
	public String convert (String method, String value); 
 
}   //  callout