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



// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_sw.hxx"



#include "ring.hxx"


/*************************************************************************
|*
|*    Ring::Ring()
|*
|*    Ersterstellung    VB	02.07.91
|*    Letzte Aenderung  JP 10.10.97
|*
*************************************************************************/

Ring::Ring( Ring *pObj )
{
	if( !pObj )
		pNext = this, pPrev = this;
	else
	{
		pNext = pObj;
		pPrev = pObj->pPrev;
		pObj->pPrev = this;
		pPrev->pNext = this;
	}
}

/*************************************************************************
|*
|*    Ring::~Ring()
|*
|*    Ersterstellung    VB	02.07.91
|*    Letzte Aenderung  JP 10.10.97
|*
*************************************************************************/

Ring::~Ring()
{
	pNext->pPrev = pPrev;
	pPrev->pNext = pNext;
}

/*************************************************************************
|*
|*    Ring::MoveTo
|*
|*    Ersterstellung    VB 4.3.91
|*    Letzte Aenderung  JP 10.10.97
|*
*************************************************************************/

void Ring::MoveTo(Ring *pDestRing)
{
	// loeschen aus dem alten
	pNext->pPrev = pPrev;
	pPrev->pNext = pNext;

	// im neuen einfuegen
	if( pDestRing )
	{
		pNext = pDestRing;
		pPrev = pDestRing->pPrev;
		pDestRing->pPrev = this;
		pPrev->pNext = this;
	}
	else
		pNext = pPrev = this;

}

void Ring::MoveRingTo(Ring *pDestRing)
{
	// den gesamten Ring in den DestRing einfuegen
	Ring* pMyPrev = pPrev;
	Ring* pDestPrev = pDestRing->pPrev;

	pMyPrev->pNext = pDestRing;
	pDestPrev->pNext = this;
	pDestRing->pPrev = pMyPrev;
	pPrev = pDestPrev;
}

sal_uInt32 Ring::numberOf() const
{
    sal_uInt32 nRet = 1;
    const Ring* pNxt = pNext;
    while( pNxt != this )
    {
        ++nRet;
        pNxt = pNxt->GetNext();
    }
    return nRet;
}