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/*
 * $Header$
 * $Revision$
 * $Date$
 *
 * ====================================================================
 *
 * Copyright 2000-2002 bob mcwhirter & James Strachan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
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 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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 *
 * ====================================================================
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Jaxen Project and was originally 
 * created by bob mcwhirter  and 
 * James Strachan .  For more information on the 
 * Jaxen Project, please see .
 * 
 * $Id$
 */


package org.jaxen.expr;

import java.util.List;

/**
 * Represents an XPath function call expression. This is production 16 in the 
 * XPath 1.0 specification:
 * 
 * [16] FunctionCall ::= FunctionName '(' ( Argument ( ',' Argument )* )? ')'
 * 
 */
@SuppressWarnings({"rawtypes"})
public interface FunctionCallExpr extends Expr
{
    
    /**
     * Returns the namespace prefix of the function. This is the empty
     * string for XPath's built-in functions. 
     * 
     * @return the namespace prefix of the function
     */
    public String getPrefix();
    
    /**
     * Returns the local name of the function. 
     * 
     * @return the local name of the function
     */
    public String getFunctionName();
    
    /**
     * Add the next argument to the function. 
     * 
     * @param parameter a function argument 
     */
    public void addParameter(Expr parameter);
    
    /**
     * Returns the the ordered list of function arguments.
     * Each member of the list is an Expr object.
     * 
     * @return the ordered list of function arguments
     */
    public List getParameters();
    
}