core/sql/optimizer/DomainDesc.h

#ifndef DOMAINDESC_H
#define DOMAINDESC_H
/* -*-C++-*-
**************************************************************************
*
* File:         DomainDesc.h        
* Description:  A Domain descriptor
* Created:      4/27/94
* Language:     C++
*
*
// @@@ START COPYRIGHT @@@
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.
//
// @@@ END COPYRIGHT @@@
*
*
**************************************************************************
*/

// -----------------------------------------------------------------------

#include "BaseTypes.h"
#include "CmpCommon.h"		// CMPASSERT
#include "Collections.h"
#include "NAType.h"

// -----------------------------------------------------------------------
// contents of this file
// -----------------------------------------------------------------------
class DomainDesc;
class DomainDescList;

// -----------------------------------------------------------------------
// forward references
// -----------------------------------------------------------------------
class SchemaDB;

// ***********************************************************************
// DomainDesc
//
// A descriptor for a Domain
// ***********************************************************************

class DomainDesc : public NABasicObject
{
public:

  // ---------------------------------------------------------------------
  // Constructor functions
  // ---------------------------------------------------------------------
  DomainDesc(SchemaDB *schemaDB,
             const NAType& refToType);

  // ---------------------------------------------------------------------
  // Accessor functions
  // ---------------------------------------------------------------------
  const NAType& getType() const 	{ return *type_; }
  
  void changeType(const NAType *type)	{ CMPASSERT(type); type_ = type; }

  NAString getTypeSQLname(NABoolean terse = FALSE) const 
				{ return getType().getTypeSQLname(terse); }

  const NAString getDomainName() const	{ return getTypeSQLname(); }

  // ---------------------------------------------------------------------
  // A default value may be associated with a column.
  // ---------------------------------------------------------------------
  ////	inline void setDefaultValue(void *bufPtr, long buflen);
  ////	inline void getDefaultValue(void *bufPtr, long *bufLen) const;

  // ---------------------------------------------------------------------
  // The following methods are required for each descriptor.
  // ---------------------------------------------------------------------
  NABoolean operator==(const DomainDesc& other) const
	     { return (getTypeSQLname() == other.getTypeSQLname()); }

private:

  // ---------------------------------------------------------------------
  // The actual descriptor for the type.
  // ---------------------------------------------------------------------
  const NAType *type_;
  
  // ---------------------------------------------------------------------
  // The default value is stored in a buffer that is of the nominal
  // size for the data type to which this column belongs (maximum size
  // for character strings.
  // The storage is untyped.
  // ---------------------------------------------------------------------
  ////	void  *defaultvalue_;

}; // class DomainDesc

// ***********************************************************************
// Implementation for inline functions
// ***********************************************************************

// -----------------------------------------------------------------------
// Accessor function for the default value
// -----------------------------------------------------------------------

////	void DomainDesc::getDefaultValue(void* bufPtr, long *bufLen) const
////	{
////	  char *dstp = (char *)bufPtr;
////	  char *srcp = (char *)defaultvalue_; // Use the size of the data type below
////	  for (int index = 0; index < *bufLen; index++)
////	    *dstp[index] = *srcp[index];
////	}

////	void DomainDesc::setDefaultValue(void *bufPtr, long buflen)
////	{
////	  char *srcp = (char *)bufPtr;
////	  char *dstp = (char *)defaultvalue_;
////	  for (int index = 0; index < buflen; index++)
////	    *dstp[index] = *srcp[index];
////	}

// ***********************************************************************
// DomainDescList
//
// A collection of descriptors for a Domain
// ***********************************************************************

class DomainDescList : public LIST(DomainDesc *)
{
public:
  DomainDescList(CollHeap* h/*=0*/) :  LIST(DomainDesc *)(h)  {}
}; // class DomainDescList

#endif /* DOMAINDESC_H */