modlist.cpp

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// $Id: modlist.cpp 1464 2006-07-18 12:32:26Z gerry $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
       Copyright on certain contributions may be held in joint with their
              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

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=================================XARAHEADEREND============================
 */

/*
*/

#include "camtypes.h"

#include "module.h"
#include "modlist.h"
#include "oilmods.h"    // for pOILModule.

CC_IMPLEMENT_MEMDUMP(ModuleListItem, ListItem)
CC_IMPLEMENT_MEMDUMP(ModuleList, List)

// Declare smart memory handling in Debug builds
#define new CAM_DEBUG_NEW

/********************************************************************************************

>   ModuleListItem(Module *pNewModule, OILModule *pNewOILModule)

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30/6/93
    Inputs:     NewModule - The module to fill in the list item with.
                pNewOILModule - pointer to the OILModule object to associate with this
                module.
    Outputs:    -
    Returns:    -
    Purpose:    Create a new ModuleListItem with the module pointer and info fields
                filled in.  The info fields are filled in by interrogating the module.
    Errors:     -

********************************************************************************************/

ModuleListItem::ModuleListItem(Module *pNewModule, OILModule *pNewOILModule)
{
    m_Initialised = FALSE;
    pNewModule->Describe( &m_ModInfo );
    m_pModule = pNewModule;
    m_pOILModule = pNewOILModule;
}

/********************************************************************************************

>   ModuleListItem::~ModuleListItem()

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    7/7/93
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Destroys a ModuleListItem.  Deletes the module contained within it.
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

ModuleListItem::~ModuleListItem()
{
    delete m_pModule;
    m_pModule = NULL;
    
    if( NULL != m_pOILModule )
    {
//      PORTNOTETRACE("other","ModuleListItem::~ModuleListItem - m_pOILModule NOT deleted");
//#ifndef EXCLUDE_FROM_XARALX
        delete m_pOILModule;
//#endif
        m_pOILModule = NULL;
    }
}

/********************************************************************************************

>   ModuleList::~ModuleList

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    7/7/93
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Destroys a module list, destroying all modules in the list too.
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

ModuleList::~ModuleList()
{
    // Call destructors on all objects in the list
    
    ModuleListItem *Item = (ModuleListItem *) RemoveHead();
    
    while (Item != NULL)
    {
        // Delete the list item
        delete Item;
        
        // Try the next item
        Item = (ModuleListItem *) RemoveHead();
    }

}

/********************************************************************************************

>   ModuleListItem *ModuleList::Add(Module *pNewModule, OILModule *pNewOILModule)

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30/6/93
    Inputs:     pNewModule - pointer to the module to add into the list.
                pNewOILModule - pointer to the OILModule object to associate with this
                module.
    Outputs:    -
    Returns:    Pointer to the new item in the list if the module was successfully added,
                NULL otherwise.
    Purpose:    Safe addition of modules to the kernel's list of known modules.  A module
                will only be added if its ID has not already been used.
    Errors:     -
    SeeAlso:    ModuleListItem

********************************************************************************************/

ModuleListItem *ModuleList::Add(Module *pNewModule, OILModule *pNewOILModule)
{
    // Construct a tentative list item.
    ModuleListItem *NewItem = new ModuleListItem(pNewModule, pNewOILModule);
    if (NewItem == NULL)
        return NULL;
        
    // Fill in the OILModule pointer with the pointer provided by the caller.
    NewItem->m_pOILModule = pNewOILModule;
    
    // Interrogate module about itself.
    if( NewItem->m_ModInfo.ID == MODULEID_INVALID )
    {
        // Invalid ID - discard new list item and abort.
        NewItem->m_pModule = NULL;                          // dont delete the module
        delete NewItem;
        return NULL;
    }
    
    
    // Search list to make sure this ID is not already in use.
    ModuleListItem *Item = (ModuleListItem *) GetHead();
    
    while (Item != NULL)
    {
        if( Item->m_ModInfo.ID == NewItem->m_ModInfo.ID )
        {
            // Found ID already in use - discard new list item and abort.
            NewItem->m_pModule = NULL;                      // dont delete the module
            delete NewItem;
            return NULL;
        }
        
        // Try the next node in the list.
        Item = (ModuleListItem *) GetNext(Item);
    }
    
    // The ID is not already in use so add the module to the list.
    AddTail(NewItem);
    return NewItem;
}

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