Function msUnionLayerInitItemInfo

mapunion.c:259–334

allocate the iteminfo index array - same order as the item list */

/* allocate the iteminfo index array - same order as the item list */
int msUnionLayerInitItemInfo(layerObj *layer)
{
    int i, numitems;
    int *itemindexes;
    char* itemlist = NULL;

    msUnionLayerInfo* layerinfo = (msUnionLayerInfo*)layer->layerinfo;

    if(layer->numitems == 0)
    {
        return MS_SUCCESS;
    }

    if (!layerinfo || !layer->map)
        return MS_FAILURE;

    /* Cleanup any previous item selection */
    msUnionLayerFreeItemInfo(layer);

    layer->iteminfo = (int *) malloc(sizeof(int) * layer->numitems);
    MS_CHECK_ALLOC(layer->iteminfo, sizeof(int) * layer->numitems, MS_FAILURE);

    itemindexes = (int*)layer->iteminfo;

    /* check whether we require attributes from the source layers also */
    numitems = 0;
    for (i = 0; i < layer->numitems; i++)
    {
        if (EQUAL(layer->items[i], MSUNION_SOURCELAYERNAME))
            itemindexes[i] = MSUNION_SOURCELAYERNAMEINDEX;
        else if (EQUAL(layer->items[i], MSUNION_SOURCELAYERGROUP))
            itemindexes[i] = MSUNION_SOURCELAYERGROUPINDEX;
        else if (EQUAL(layer->items[i], MSUNION_SOURCELAYERVISIBLE))
            itemindexes[i] = MSUNION_SOURCELAYERVISIBLEINDEX;
        else
        {
            itemindexes[i] = numitems++;
            if (itemlist)
            {
                itemlist = msStringConcatenate(itemlist, ",");
                itemlist = msStringConcatenate(itemlist, layer->items[i]);
            }
            else
            {
                itemlist = msStrdup(layer->items[i]);
            }
        }
    }

    for (i = 0; i < layerinfo->layerCount; i++)
    { 
        layerObj* srclayer = &layerinfo->layers[i];

        msUnionLayerFreeExpressionTokens(srclayer);
        
        if (itemlist)
        {
            /* get items requested by the union layer plus the required items */