/**************************************************************
 * 
 * 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.
 * 
 *************************************************************/



#ifndef ADC_CPP_SUB_PE_HXX
#define ADC_CPP_SUB_PE_HXX



// USED SERVICES
	// BASE CLASSES
	// COMPONENTS
	// PARAMETERS


class ParseEnvironment;

template <class PE, class SUB>
class SubPe
{
  public:
	typedef SubPe< PE, SUB > 	self;

						SubPe(
							PE &				i_rParent );
	PE &				Parent() const;
	SUB &				Child() const;

	ParseEnvironment &	Get() const;

  private:
	SUB &				CreateChild() const;

	PE &				rParent;
	Dyn<SUB>			pChild;
};



// IMPLEMENTATION


// 	SubPe

template <class PE, class SUB>
SubPe<PE,SUB>::SubPe( PE & i_rParent )
	:	rParent(i_rParent)
{
}

template <class PE, class SUB>
PE &
SubPe<PE,SUB>::Parent() const
{
 	return rParent;
}

template <class PE, class SUB>
inline SUB &
SubPe<PE,SUB>::Child() const
{
	return pChild ? *pChild.MutablePtr() : CreateChild();
}

template <class PE, class SUB>
ParseEnvironment &
SubPe<PE,SUB>::Get() const
{
	return Child();
}

template <class PE, class SUB>
SUB &
SubPe<PE,SUB>::CreateChild() const
{
    self * pThis = const_cast< self* >(this);

    SUB * pNewChild = new SUB( &rParent);

	pThis->pChild = pNewChild;

	return *pChild.MutablePtr();
}




#endif