Function msUnionLayerOpen

mapunion.c:85–205

}

int msUnionLayerOpen(layerObj *layer)
{
    msUnionLayerInfo *layerinfo;
    char **layerNames;
    mapObj* map;
    int i;
    int layerCount;

    if (layer->layerinfo != NULL)
    {
      return MS_SUCCESS;  // Nothing to do... layer is already opened
    }
    
    if (!layer->connection)
    {
        msSetError(MS_MISCERR, "The CONNECTION option is not specified for layer: %s", layer->name);
        return MS_FAILURE;
    }

    if (!layer->map)
    {
        msSetError(MS_MISCERR, "No map assigned to this layer: %s", layer->name);
        return MS_FAILURE;
    }

    map = layer->map;

    layerinfo =(msUnionLayerInfo*)malloc(sizeof(msUnionLayerInfo));
    MS_CHECK_ALLOC(layerinfo, sizeof(msUnionLayerInfo), MS_FAILURE);

    layer->layerinfo = layerinfo;
    layerinfo->layerIndex = 0;

    layerinfo->classgroup = NULL;
    layerinfo->nclasses = 0;

    layerinfo->layerCount = 0;

    layerinfo->classText = NULL;
    
    layerNames = msStringSplit(layer->connection, ',', &layerCount);

    if (layerCount == 0)
    {
        msSetError(MS_MISCERR, "No source layers specified in layer: %s", layer->name);
        if(layerNames)
                msFreeCharArray(layerNames, layerinfo->layerCount);
        msUnionLayerClose(layer);
        return MS_FAILURE;
    }

    layerinfo->layers =(layerObj*)malloc(layerCount * sizeof(layerObj));
    MS_CHECK_ALLOC(layerinfo->layers, layerCount * sizeof(layerObj), MS_FAILURE);

    layerinfo->status =(int*)malloc(layerCount * sizeof(int));
    MS_CHECK_ALLOC(layerinfo->status, layerCount * sizeof(int), MS_FAILURE);

    for(i=0; i < layerCount; i++)