/**************************************************************
 * 
 * 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_svl.hxx"
#include <svl/pickerhistory.hxx>
#include <svl/pickerhistoryaccess.hxx>
#include <cppuhelper/weakref.hxx>
#include <vector>

//.........................................................................
namespace svt
{
//.........................................................................
	using namespace ::com::sun::star::uno;

	namespace
	{
		typedef ::com::sun::star::uno::WeakReference< XInterface >	InterfaceAdapter;
		typedef ::std::vector< InterfaceAdapter  >					InterfaceArray;

		// ----------------------------------------------------------------
		InterfaceArray& getFolderPickerHistory()
		{
			static InterfaceArray s_aHistory;
			return s_aHistory;
		}

		// ----------------------------------------------------------------
		InterfaceArray& getFilePickerHistory()
		{
			static InterfaceArray s_aHistory;
			return s_aHistory;
		}

		// ----------------------------------------------------------------
		void implPushBackPicker( InterfaceArray& _rHistory, const Reference< XInterface >& _rxPicker )
		{
			if ( !_rxPicker.is() )
				return;

            //=============================================================
			// first, check which of the objects we hold in s_aHistory can be removed
			{
				InterfaceArray aCleanedHistory;
				for	(	InterfaceArray::const_iterator aLoop = _rHistory.begin();
						aLoop != _rHistory.end();
						++aLoop
					)
				{
					Reference< XInterface > xCurrent( aLoop->get() );
					if ( xCurrent.is() )
					{
						if ( aCleanedHistory.empty() )
							// make some room, assume that all interfaces (from here on) are valie
							aCleanedHistory.reserve( _rHistory.size() - ( aLoop - _rHistory.begin() ) );
						aCleanedHistory.push_back( InterfaceAdapter( xCurrent ) );
					}
				}
				_rHistory.swap( aCleanedHistory );
			}

            //=============================================================
			// then push_back the picker
			_rHistory.push_back( InterfaceAdapter( _rxPicker ) );
		}

		//-----------------------------------------------------------------
		Reference< XInterface > implGetTopMostPicker( const InterfaceArray& _rHistory )
		{
			Reference< XInterface > xTopMostAlive;

            //=============================================================
			// search the first picker which is still alive ...
			for	(	InterfaceArray::const_reverse_iterator aLoop = _rHistory.rbegin();
					( aLoop != _rHistory.rend() ) && !xTopMostAlive.is();
					++aLoop
				)
			{
				xTopMostAlive = aLoop->get();
			}

			return xTopMostAlive;
		}
	}

	//---------------------------------------------------------------------
	Reference< XInterface > GetTopMostFolderPicker( )
	{
		return implGetTopMostPicker( getFolderPickerHistory() );
	}

	//---------------------------------------------------------------------
	Reference< XInterface > GetTopMostFilePicker( )
	{
		return implGetTopMostPicker( getFilePickerHistory() );
	}

	//---------------------------------------------------------------------
	void addFolderPicker( const Reference< XInterface >& _rxPicker )
	{
		implPushBackPicker( getFolderPickerHistory(), _rxPicker );
	}

	//---------------------------------------------------------------------
	void addFilePicker( const Reference< XInterface >& _rxPicker )
	{
		implPushBackPicker( getFilePickerHistory(), _rxPicker );
	}

//.........................................................................
}	// namespace svt
//.........................................................................