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       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #include <helper/ocomponentenumeration.hxx>
      21             : 
      22             : #include <vcl/svapp.hxx>
      23             : 
      24             : namespace framework{
      25             : 
      26             : using namespace ::com::sun::star::container;
      27             : using namespace ::com::sun::star::lang;
      28             : using namespace ::com::sun::star::uno;
      29             : using namespace ::cppu;
      30             : using namespace ::osl;
      31             : 
      32             : //  constructor
      33             : 
      34         170 : OComponentEnumeration::OComponentEnumeration( const Sequence< css::uno::Reference< XComponent > >& seqComponents )
      35             :         :   m_nPosition     ( 0                             )   // 0 is the first position for a valid list and the right value for an invalid list to!
      36         170 :         ,   m_seqComponents ( seqComponents                 )
      37         170 : {}
      38             : 
      39             : //  destructor
      40             : 
      41         510 : OComponentEnumeration::~OComponentEnumeration()
      42             : {
      43             :     // Reset instance, free memory ....
      44         170 :     impl_resetObject();
      45         340 : }
      46             : 
      47             : //  XEventListener
      48           0 : void SAL_CALL OComponentEnumeration::disposing( const EventObject& aEvent ) throw( RuntimeException, std::exception )
      49             : {
      50           0 :     SolarMutexGuard g;
      51             : 
      52             :     // Safe impossible cases
      53             :     // This method is not specified for all incoming parameters.
      54             :     (void) aEvent;
      55             :     SAL_WARN_IF( !aEvent.Source.is(), "fwk", "OComponentEnumeration::disposing(): Invalid parameter detected!" );
      56             : 
      57             :     // Reset instance to defaults, release references and free memory.
      58           0 :     impl_resetObject();
      59           0 : }
      60             : 
      61             : //  XEnumeration
      62         526 : sal_Bool SAL_CALL OComponentEnumeration::hasMoreElements() throw( RuntimeException, std::exception )
      63             : {
      64         526 :     SolarMutexGuard g;
      65             : 
      66             :     // First position in a valid list is 0.
      67             :     // => The last one is getLength() - 1!
      68             :     // m_nPosition's current value is the position for the next element, which will be return, if user call "nextElement()"
      69             :     // => We have more elements if current position less then the length of the list!
      70         526 :     return ( m_nPosition < (sal_uInt32)(m_seqComponents.getLength()) );
      71             : }
      72             : 
      73             : //  XEnumeration
      74             : 
      75         178 : Any SAL_CALL OComponentEnumeration::nextElement() throw(    NoSuchElementException  ,
      76             :                                                              WrappedTargetException ,
      77             :                                                             RuntimeException, std::exception        )
      78             : {
      79         178 :     SolarMutexGuard g;
      80             : 
      81             :     // If we have no elements or end of enumeration is arrived ...
      82         178 :     if ( hasMoreElements() == sal_False )
      83             :     {
      84             :         // .. throw an exception!
      85           0 :         throw NoSuchElementException();
      86             :     }
      87             : 
      88             :     // Else; Get next element from list ...
      89         178 :     Any aComponent;
      90         178 :     aComponent <<= m_seqComponents[m_nPosition];
      91             :     // ... and step to next element!
      92         178 :     ++m_nPosition;
      93             : 
      94             :     // Return listitem.
      95         178 :     return aComponent;
      96             : }
      97             : 
      98             : //  proteced method
      99             : 
     100         170 : void OComponentEnumeration::impl_resetObject()
     101             : {
     102             :     // Attention:
     103             :     // Write this for multiple calls - NOT AT THE SAME TIME - but for more than one call again)!
     104             :     // It exist two ways to call this method. From destructor and from disposing().
     105             :     // I can't say, which one is the first. Normally the disposing-call - but other way ....
     106             : 
     107             :     // Delete list of components.
     108         170 :     m_seqComponents.realloc( 0 );
     109             :     // Reset position in list.
     110             :     // The list has no elements anymore. m_nPosition is normally the current position in list for nextElement!
     111             :     // But a position of 0 in a list of 0 items is an invalid state. This constellation can't work in future.
     112             :     // End of enumeration is arrived!
     113             :     // (see hasMoreElements() for more details...)
     114         170 :     m_nPosition = 0;
     115         170 : }
     116             : 
     117         951 : }       //  namespace framework
     118             : 
     119             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */