/*
 * 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: XQCastableAs.hpp 475 2008-01-08 18:47:44Z jpcs $
 */

#ifndef _XQCASTABLEAS_HPP
#define _XQCASTABLEAS_HPP

#include <xqilla/framework/XQillaExport.hpp>

#include <xqilla/ast/ASTNodeImpl.hpp>
#include <xqilla/runtime/SingleResult.hpp>

class SequenceType;

class XQILLA_API XQCastableAs : public ASTNodeImpl
{
public:
  XQCastableAs(ASTNode* expr, SequenceType* exprType, XPath2MemoryManager* memMgr);

  virtual Result createResult(DynamicContext* context, int flags=0) const;
  virtual ASTNode* staticResolution(StaticContext *context);
  virtual ASTNode *staticTyping(StaticContext *context);

  const ASTNode *getExpression() const;
  const SequenceType *getSequenceType() const;
  bool isPrimitive() const { return _isPrimitive; }
  AnyAtomicType::AtomicObjectType getTypeIndex() const { return _typeIndex; }  

  void setExpression(ASTNode *item);

protected:
  class CastableAsResult : public SingleResult
  {
  public:
    CastableAsResult(const XQCastableAs *di);

    Item::Ptr getSingleResult(DynamicContext *context) const;
    std::string asString(DynamicContext *context, int indent) const;

  private:
    const XQCastableAs *_di;
  };

  ASTNode* _expr;
  SequenceType* _exprType;
  bool _isPrimitive;
  AnyAtomicType::AtomicObjectType _typeIndex;
};

#endif // _XQCASTABLEAS_HPP
