/*
 * 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 <assert.h>
#include <xqilla/operators/GreaterThanEqual.hpp>
#include <xqilla/operators/LessThan.hpp>
#include <xqilla/items/ATBooleanOrDerived.hpp>
#include <xqilla/context/DynamicContext.hpp>
#include <xqilla/context/impl/CodepointCollation.hpp>
#include <xqilla/exceptions/XPath2ErrorException.hpp>

/*static*/ const XMLCh GreaterThanEqual::name[]={ XERCES_CPP_NAMESPACE_QUALIFIER chLatin_g, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_e, XERCES_CPP_NAMESPACE_QUALIFIER chNull };

GreaterThanEqual::GreaterThanEqual(const VectorOfASTNodes &args, XPath2MemoryManager* memMgr)
  : ComparisonOperator(name, args, memMgr)
{
}

/*static*/ bool GreaterThanEqual::greater_than_equal(const AnyAtomicType::Ptr &arg1, const AnyAtomicType::Ptr &arg2, Collation* collation, DynamicContext* context, const LocationInfo *info)
{
  // A ge B numeric               numeric                 op:numeric-greater-than(A, B) or op:numeric-equal(A, B)
  // A ge B xs:boolean            xs:boolean              fn:not(op:boolean-less-than(A, B))
  // A ge B xs:string             xs:string               op:numeric-greater-than(fn:compare(A, B), -1)
  // A ge B xs:date               xs:date                 fn:not(op:date-less-than(A, B))
  // A ge B xs:time               xs:time                 fn:not(op:time-less-than(A, B))
  // A ge B xs:dateTime           xs:dateTime             fn:not(op:datetime-less-than(A, B))
  // A ge B xdt:yearMonthDuration xdt:yearMonthDuration   fn:not(op:yearMonthDuration-less-than(A, B))
  // A ge B xdt:dayTimeDuration   xdt:dayTimeDuration     fn:not(op:dayTimeDuration-less-than(A, B))
  // numeric values need a special comparison, for the others we can just rely on LessThan
  if(arg1->isNumericValue() && arg2->isNumericValue()) {
    if(((Numeric*)arg1.get())->getState() == Numeric::NaN ||
       ((Numeric*)arg2.get())->getState() == Numeric::NaN) return false;
  }

  return !LessThan::less_than(arg1,arg2,collation,context, info);
}

bool GreaterThanEqual::execute(const AnyAtomicType::Ptr &atom1, const AnyAtomicType::Ptr &atom2, DynamicContext *context) const
{
  return greater_than_equal(atom1,atom2,context->getDefaultCollation(this),context, this);
}

