Hello,
I would be most grateful for help with the following. Below is some annotated Java code and output for two different attempts at opening a mosaic dataset, neither of which work for me. Further below is the equivalent C# code and output, which does work. I've tried with both ArcGIS Desktop 10.2.1 and 10.2.2, standard edition.
Thanks, Peter Barrs.
// JAVA static void accessMosaicDataset() throws IOException { IWorkspaceFactory wf = new FileGDBWorkspaceFactory(); IWorkspace ws = wf.openFromFile("C:\\temp\\DataArchiveCatalog.gdb", 0); // below is the recommended access method and aligns with the object diagram // "DataSourcesRaster Object Model (Mosaic Dataset)" IMosaicWorkspaceExtensionHelper helper = new MosaicWorkspaceExtensionHelper(); IMosaicWorkspaceExtension mwex = helper .findExtension(ws); System.out.println("\nMethod 1 - direct open"); // fails here (md is always null, no error), no exception is thrown // if the name is changed to a non existent mosaic dataset name, an exception is // thrown to that effect // However, it is possible to delete the mosaic dataset IMosaicDataset md = mwex.openMosaicDataset("DataArchiveImageCatalog"); if (md == null) System.out.println("md = null"); else System.out.println("md catalog oid name = " + md.getCatalog().getOIDFieldName()); System.out.println("\nMethod 2 - open using an IWorkspaceName obtained by enumeration"); IDatasetContainer3 dscntr = (IDatasetContainer3) mwex; IEnumDatasetName dns = dscntr .getDatasetNames(esriDatasetType.esriDTMosaicDataset); IDatasetName dn = dns.next(); // actually gives a IDatasetNameProxy // which cannot be cast to IMosaicDatasetName while (dn != null) { // prints mosaic dataset name System.out.println("dataset name: " + dn.getName()); // prints geodatabase name IWorkspaceName wn = dn.getWorkspaceName(); System.out.println("workspace name = " + wn.getBrowseName()); MosaicDatasetName mdn = new MosaicDatasetName(); mdn.setWorkspaceNameByRef(wn); mdn.setName(dn.getName()); Object o = mdn.open(); // In the eclipse debugger, o is shown as an RasterDataset // and it can indeed be opened as a RasterDataset IRasterDataset rd = (IRasterDataset) mdn.open(); System.out.println("as raster dataset, format = " + rd.getFormat()); // Attempting to open it as an IMosaicDataset fails // com.esri.arcgis.datasourcesraster.RasterDataset cannot be cast to com.esri.arcgis.datasourcesraster.IMosaicDataset md = (IMosaicDataset) mdn.open(); System.out.println("md catalog oid name = " + md.getCatalog().getOIDFieldName()); dn = dns.next(); } }
Java output
Method 1 - direct open
md = null
Method 2 - open using an IWorkspaceName obtained by enumeration
dataset name: DataArchiveImageCatalog
workspace name = DataArchiveCatalog
as raster dataset, format = AMD
Exception in thread "main" java.lang.ClassCastException: com.esri.arcgis.datasourcesraster.RasterDataset cannot be cast to com.esri.arcgis.datasourcesraster.IMosaicDataset
at mosaicDataset.Main.accessMosaicDataset(Main.java:117)
at mosaicDataset.Main.main(Main.java:43)
C# Version
// C# equivalent static void accessMosaicDataset() { IWorkspaceFactory wf = new FileGDBWorkspaceFactory(); IWorkspace ws = wf.OpenFromFile("C:\\temp\\DataArchiveCatalog.gdb", 0); IMosaicWorkspaceExtensionHelper helper = new MosaicWorkspaceExtensionHelper(); IMosaicWorkspaceExtension mwex = helper .FindExtension(ws); Debug.WriteLine("\nMethod 1 - direct open - works fine"); IMosaicDataset md = mwex.OpenMosaicDataset("DataArchiveImageCatalog"); Debug.WriteLine("md catalog oid name = " + md.Catalog.OIDFieldName); Debug.WriteLine("\nMethod 2 - open using an IWorkspaceName obtained by enumeration - works fine"); IDatasetContainer3 dscntr = (IDatasetContainer3)mwex; IEnumDatasetName dns = dscntr .get_DatasetNames(esriDatasetType.esriDTMosaicDataset); IDatasetName dn = dns.Next(); while (dn != null) { // prints mosaic dataset name Debug.WriteLine("dataset name: " + dn.Name); // prints geodatabase name IWorkspaceName wn = dn.WorkspaceName; Debug.WriteLine("workspace name = " + wn.BrowseName); MosaicDatasetNameClass mdn = new MosaicDatasetNameClass(); mdn.WorkspaceName = wn; mdn.Name = dn.Name; IMosaicDataset md2 = (IMosaicDataset)mdn.Open(); IFeatureClass cat = md2.Catalog; Debug.WriteLine("md catalog oid name = " + md2.Catalog.OIDFieldName); dn = dns.Next(); } }
C# output
Method 1 - direct open - works fine
md catalog oid name = OBJECTID
Method 2 - open using an IWorkspaceName obtained by enumeration - works fine
dataset name: DataArchiveImageCatalog
workspace name = DataArchiveCatalog
md catalog oid name = OBJECTID
