/*
 * Copyright (c) 2001-2008
 *     DecisionSoft Limited. All rights reserved.
 * Copyright (c) 2004-2008
 *     Oracle. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * $Id$
 */

#include "../config/xqilla_config.h"
#include <xqilla/functions/FunctionPrefixFromQName.hpp>
#include <xqilla/context/DynamicContext.hpp>
#include <xqilla/items/ATQNameOrDerived.hpp>
#include <xqilla/items/ATStringOrDerived.hpp>
#include <xqilla/items/DatatypeFactory.hpp>
#include <xercesc/validators/schema/SchemaSymbols.hpp>

const XMLCh FunctionPrefixFromQName::name[] = {
  XERCES_CPP_NAMESPACE_QUALIFIER chLatin_p, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_r, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_e, 
  XERCES_CPP_NAMESPACE_QUALIFIER chLatin_f, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_i, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_x, 
  XERCES_CPP_NAMESPACE_QUALIFIER chDash,    XERCES_CPP_NAMESPACE_QUALIFIER chLatin_f, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_r, 
  XERCES_CPP_NAMESPACE_QUALIFIER chLatin_o, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_m, XERCES_CPP_NAMESPACE_QUALIFIER chDash, 
  XERCES_CPP_NAMESPACE_QUALIFIER chLatin_Q, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_N, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_a, 
  XERCES_CPP_NAMESPACE_QUALIFIER chLatin_m, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_e, XERCES_CPP_NAMESPACE_QUALIFIER chNull 
};
const unsigned int FunctionPrefixFromQName::minArgs = 1;
const unsigned int FunctionPrefixFromQName::maxArgs = 1;

/**
 * fn:prefix-from-QName($arg as xs:QName?) as xs:NCNAME?
**/

FunctionPrefixFromQName::FunctionPrefixFromQName(const VectorOfASTNodes &args, XPath2MemoryManager* memMgr)
  : ConstantFoldingFunction(name, minArgs, maxArgs, "QName?", args, memMgr)
{
  _src.getStaticType() = StaticType(StaticType::STRING_TYPE, 0, 1);
}

Sequence FunctionPrefixFromQName::createSequence(DynamicContext* context, int flags) const
{
  Sequence arg=getParamNumber(1,context)->toSequence(context);
  if(arg.isEmpty())
    return Sequence(context->getMemoryManager());
  const XMLCh* prefix=((const ATQNameOrDerived*)(const Item*)arg.first())->getPrefix();
  if(prefix && *prefix)
    return Sequence(context->getItemFactory()->createStringOrDerived(XERCES_CPP_NAMESPACE_QUALIFIER SchemaSymbols::fgURI_SCHEMAFORSCHEMA,
                                                                     XERCES_CPP_NAMESPACE_QUALIFIER SchemaSymbols::fgDT_NCNAME,
                                                                     prefix, 
                                                                     context),
                    context->getMemoryManager());
  return Sequence(context->getMemoryManager());
}
