[pktools] 321/375: trying overwrite in createLayer in ImgWriterOgr.cc

[Bas Couwenberg]

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sebastic-guest pushed a commit to branch upstream-master
in repository pktools.

commit 232189d00cc5dd0cbc7f168e941465b2f9bca0d9
Author: Pieter Kempeneers <kempenep at gmail.com>
Date:   Sat Sep 13 22:34:28 2014 +0200

    trying overwrite in createLayer in ImgWriterOgr.cc
---
 src/imageclasses/ImgWriterOgr.cc | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/imageclasses/ImgWriterOgr.cc b/src/imageclasses/ImgWriterOgr.cc
index 4f040cf..226fff3 100644
--- a/src/imageclasses/ImgWriterOgr.cc
+++ b/src/imageclasses/ImgWriterOgr.cc
@@ -176,6 +176,29 @@ OGRLayer* ImgWriterOgr::createLayer(const std::string& layername, const std::str
   //if points: use wkbPoint
   //if no constraints on the types geometry to be written: use wkbUnknown 
   OGRLayer* poLayer;
+
+  //always overwrite...
+  //todo: test if overwrite works...
+  //check if layername already exists for this dataset
+  int iLayer = -1;
+  poLayer=m_datasource->GetLayerByName(layername.c_str());
+  if(poLayer!=NULL){
+    int nLayerCount = m_datasource->GetLayerCount();
+    for(iLayer = 0; iLayer < nLayerCount; iLayer++ ){
+      OGRLayer *tmpLayer = m_datasource->GetLayer(iLayer);
+      if (tmpLayer == poLayer)
+	break;
+    }
+    if (iLayer == nLayerCount){
+      // shouldn't happen with an ideal driver
+      poLayer = NULL;
+    }
+    if(m_datasource->DeleteLayer(iLayer)!=OGRERR_NONE){
+      std::string errorstring="DeleteLayer() failed when overwrite requested";
+      throw(errorstring);
+    }
+  }
+
   OGRSpatialReference oSRS;
 
   if(theProjection!=""){

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