function DuplicateSessionLayer($map, $resourceService, $sourceLayerId, $suffix)
{
//create the new session MgResourceIdentifier
$destinationLayerId = CreateSessionResourceId($sourceLayerId, $suffix);
//copy content from source layer
$contentReader = $resourceService->GetResourceContent($sourceLayerId);
$layerContent = $contentReader->ToString();
//set the feature source this layer references -- must be in the session
//the feature source need not exist before calling this function
$sourceLayer = new MgLayer($sourceLayerId, $resourceService);
$sourceFeatureSourceId = new MgResourceIdentifier($sourceLayer->GetFeatureSourceId());
$destinationFeatureSourceId = CreateSessionResourceId($sourceFeatureSourceId, $suffix);
//replace the featuresourceid and write xml to the session copy
$layerContent = str_replace($sourceFeatureSourceId->ToString(), $destinationFeatureSourceId->ToString(), $layerContent);
$byteSource = new MgByteSource($layerContent, strlen($layerContent));
$resourceService->SetResource($destinationLayerId, $byteSource->GetReader(), null);
//instantiate the new layer from its MgResourceIdentifier
$layer = new MgLayer($destinationLayerId, $resourceService);
//add the edit layer to the session map and set it to redraw but not be visible in the legend
$layerCollection = $map->GetLayers();
$originalLayer = FindLayer($layerCollection, $sourceLayer->GetLayerDefinition()->ToString());
$nPosition = $layerCollection->IndexOf($originalLayer);
$layerCollection->Insert($nPosition, $layer);
$layer->SetDisplayInLegend(false);
$layer->SetSelectable(true);
$layer->ForceRefresh();
//OR
//remove the source layer from the session map and replace it with the
//session copy
//ReplaceLayer($map, $sourceLayer, $layer);
//save the session map
try {
$map->Save($resourceService);
} catch (MgException $e) {
echo "ERROR: " . $e->GetExceptionMessage() . "n";
echo $e->GetDetails() . "n";
echo $e->GetStackTrace() . "n";
}
return $layer;
}
*****************************************************************************/
/*****************************************************************************
TODO: check user permissions to edit the resource
*****************************************************************************/
/*****************************************************************************
get the layer's geometric type(s)
*****************************************************************************/
/*****************************************************************************
get the layer's attributes and types
*****************************************************************************/
$attributes = GetFeatureSourceAttributes($map, $layer->GetLayerDefinition(), $featureService);
/*****************************************************************************
determine whether a shadow feature source has been created for the layer
*****************************************************************************/
// convert the feature resource for the selected layer to the shadow version
$shadowResourceId = CreateSessionResourceId($dataSourceId, '-shadow');
$hasShadow = 'false';
if (DataSourceExists($resourceService, $shadowResourceId)) {
$hasShadow = 'true';
}
//get class definition from the featureSource
$classDefinition = GetFeatureClassDefinition($featureService, $layer, $dataSourceId);
//MgPropertyDefinition classProps
$classProps = $classDefinition->GetProperties();
$featureGeometryName = $layer->GetFeatureGeometryName();
$aLayerTypes = array();
$aProperties = array();
for ($i = 0; $i < $classProps->GetCount(); $i++) {
$prop = $classProps->GetItem($i);
if ($prop->GetPropertyType() == MgFeaturePropertyType::GeometricProperty) {
$featureClass = $prop->GetGeometryTypes();