/*
 * Copyright (c) 2001-2006
 *     DecisionSoft Limited. All rights reserved.
 * Copyright (c) 2004-2006
 *     Progress Software Corporation. All rights reserved.
 * Copyright (c) 2004-2006
 *     Oracle. All rights reserved.
 *
 * See the file LICENSE for redistribution information.
 *
 * $Id: FunctionString.hpp,v 1.9 2006/11/01 16:37:13 jpcs Exp $
 */

/*

  String function

*/

#ifndef _FUNCTIONSTRING_HPP
#define _FUNCTIONSTRING_HPP

#include <xqilla/framework/XQillaExport.hpp>

#include <xqilla/ast/XQFunction.hpp>

/** String operator function. */
class XQILLA_API FunctionString : public XQFunction
{
public:
  static const XMLCh name[];
  static const unsigned int minArgs;
  static const unsigned int maxArgs;

  FunctionString(const VectorOfASTNodes &args, XPath2MemoryManager* memMgr);
  
  /**
   * Called during static analysis to determine if statically correct.
   * Performs constant folding if the function has an argument, and it
   * is constant.
   */
  virtual ASTNode* staticResolution(StaticContext *context);
  virtual ASTNode *staticTyping(StaticContext *context);

  /** Returns the argument as a String **/
  Sequence collapseTreeInternal(DynamicContext* context, int flags=0) const;

  static Item::Ptr string(const Item::Ptr &item, DynamicContext *context);
};

#endif // _FUNCTIONSTRING_HPP