Exemplo n.º 1
0
        public void Execute(ESRI.ArcGIS.esriSystem.IArray paramvalues, ESRI.ArcGIS.esriSystem.ITrackCancel TrackCancel, ESRI.ArcGIS.Geoprocessing.IGPEnvironmentManager envMgr, ESRI.ArcGIS.Geodatabase.IGPMessages message)
        {
            try
            {
                IGPUtilities3 execute_Utilities = new GPUtilitiesClass();

                if (TrackCancel == null)
                {
                    TrackCancel = new CancelTrackerClass();
                }

                IGPParameter inputOSMParameter = paramvalues.get_Element(in_osmFeatureClass) as IGPParameter;
                IGPValue     inputOSMGPValue   = execute_Utilities.UnpackGPValue(inputOSMParameter);

                IGPParameter  tagCollectionParameter = paramvalues.get_Element(in_attributeSelector) as IGPParameter;
                IGPMultiValue tagCollectionGPValue   = execute_Utilities.UnpackGPValue(tagCollectionParameter) as IGPMultiValue;

                if (tagCollectionGPValue == null)
                {
                    message.AddError(120048, string.Format(resourceManager.GetString("GPTools_NullPointerParameterType"), tagCollectionParameter.Name));
                    return;
                }

                bool useUpdateCursor = false;

                IFeatureClass osmFeatureClass = null;
                ITable        osmInputTable   = null;
                IQueryFilter  osmQueryFilter  = null;

                try
                {
                    execute_Utilities.DecodeFeatureLayer(inputOSMGPValue, out osmFeatureClass, out osmQueryFilter);
                    if (osmFeatureClass != null)
                    {
                        if (osmFeatureClass.Extension is IOSMClassExtension)
                        {
                            useUpdateCursor = false;
                        }
                        else
                        {
                            useUpdateCursor = true;
                        }
                    }

                    osmInputTable = osmFeatureClass as ITable;
                }
                catch { }

                try
                {
                    if (osmInputTable == null)
                    {
                        execute_Utilities.DecodeTableView(inputOSMGPValue, out osmInputTable, out osmQueryFilter);
                    }
                }
                catch { }

                if (osmInputTable == null)
                {
                    string errorMessage = String.Format(resourceManager.GetString("GPTools_OSMGPAttributeSelecto_unableopentable"), inputOSMGPValue.GetAsText());
                    message.AddError(120053, errorMessage);
                    return;
                }

                // find the field that holds tag binary/xml field
                int osmTagCollectionFieldIndex = osmInputTable.FindField("osmTags");


                // if the Field doesn't exist - wasn't found (index = -1) get out
                if (osmTagCollectionFieldIndex == -1)
                {
                    message.AddError(120005, resourceManager.GetString("GPTools_OSMGPAttributeSelector_notagfieldfound"));
                    return;
                }

                // check if the tag collection includes the keyword "ALL", if does then we'll need to extract all tags
                bool extractAll = false;
                for (int valueIndex = 0; valueIndex < tagCollectionGPValue.Count; valueIndex++)
                {
                    if (tagCollectionGPValue.get_Value(valueIndex).GetAsText().Equals("ALL"))
                    {
                        extractAll = true;
                        break;
                    }
                }
                //if (extractAll)
                //{
                //    if (osmTagKeyCodedValues == null)
                //        extractAllTags(ref osmTagKeyCodedValues, osmInputTable, osmQueryFilter, osmTagCollectionFieldIndex, false);

                //    if (osmTagKeyCodedValues == null)
                //    {
                //        message.AddAbort(resourceManager.GetString("GPTools_OSMGPAttributeSelector_Unable2RetrieveTags"));
                //        return;
                //    }

                //    // empty the existing gp multivalue object
                //    tagCollectionGPValue = new GPMultiValueClass();

                //    // fill the coded domain in gp multivalue object
                //    for (int valueIndex = 0; valueIndex < osmTagKeyCodedValues.CodeCount; valueIndex++)
                //    {
                //        tagCollectionGPValue.AddValue(osmTagKeyCodedValues.get_Value(valueIndex));
                //    }
                //}

                // get an overall feature count as that determines the progress indicator
                int featureCount = osmInputTable.RowCount(osmQueryFilter);

                // set up the progress indicator
                IStepProgressor stepProgressor = TrackCancel as IStepProgressor;

                if (stepProgressor != null)
                {
                    stepProgressor.MinRange  = 0;
                    stepProgressor.MaxRange  = featureCount;
                    stepProgressor.Position  = 0;
                    stepProgressor.Message   = resourceManager.GetString("GPTools_OSMGPAttributeSelector_progressMessage");
                    stepProgressor.StepValue = 1;
                    stepProgressor.Show();
                }

                // let's get all the indices of the desired fields
                // if the field already exists get the index and if it doesn't exist create it
                Dictionary <string, int> tagsAttributesIndices = new Dictionary <string, int>();
                Dictionary <int, int>    attributeFieldLength  = new Dictionary <int, int>();

                IFeatureWorkspaceManage featureWorkspaceManage = ((IDataset)osmInputTable).Workspace as IFeatureWorkspaceManage;

                String illegalCharacters = String.Empty;

                ISQLSyntax sqlSyntax = ((IDataset)osmInputTable).Workspace as ISQLSyntax;
                if (sqlSyntax != null)
                {
                    illegalCharacters = sqlSyntax.GetInvalidCharacters();
                }

                IFieldsEdit fieldsEdit = osmInputTable.Fields as IFieldsEdit;


                using (SchemaLockManager lockMgr = new SchemaLockManager(osmInputTable))
                {
                    try
                    {
                        string tagKey = String.Empty;
                        ESRI.ArcGIS.Geoprocessing.IGeoProcessor2 gp = new ESRI.ArcGIS.Geoprocessing.GeoProcessorClass();

                        // if we have explicitly defined tags to extract then go through the list of values now
                        if (extractAll == false)
                        {
                            for (int valueIndex = 0; valueIndex < tagCollectionGPValue.Count; valueIndex++)
                            {
                                if (TrackCancel.Continue() == false)
                                {
                                    return;
                                }

                                try
                                {
                                    // Check if the input field already exists.
                                    string nameofTag = tagCollectionGPValue.get_Value(valueIndex).GetAsText();
                                    tagKey = convert2AttributeFieldName(nameofTag, illegalCharacters);

                                    int fieldIndex = osmInputTable.FindField(tagKey);

                                    if (fieldIndex < 0)
                                    {
                                        // generate a new attribute field
                                        IFieldEdit fieldEdit = new FieldClass();
                                        fieldEdit.Name_2      = tagKey;
                                        fieldEdit.AliasName_2 = nameofTag + resourceManager.GetString("GPTools_OSMGPAttributeSelector_aliasaddition");
                                        fieldEdit.Type_2      = esriFieldType.esriFieldTypeString;
                                        fieldEdit.Length_2    = 100;

                                        osmInputTable.AddField(fieldEdit);

                                        message.AddMessage(string.Format(resourceManager.GetString("GPTools_OSMGPAttributeSelector_addField"), tagKey, nameofTag));

                                        // re-generate the attribute index
                                        fieldIndex = osmInputTable.FindField(tagKey);
                                    }

                                    if (fieldIndex > 0)
                                    {
                                        tagsAttributesIndices.Add(nameofTag, fieldIndex);
                                        attributeFieldLength.Add(fieldIndex, osmInputTable.Fields.get_Field(fieldIndex).Length);
                                    }
                                }
                                catch (Exception ex)
                                {
                                    // the key is already there, this might result because from multiple upper and lower-case combinations of the same key
                                    message.AddWarning(ex.Message + " (" + convert2OSMKey(tagKey, illegalCharacters) + ")");
                                }
                            }
                        }
                        else
                        {
                            List <string> listofAllTags = extractAllTags(osmInputTable, osmQueryFilter, osmTagCollectionFieldIndex);

                            foreach (string nameOfTag in listofAllTags)
                            {
                                if (TrackCancel.Continue() == false)
                                {
                                    return;
                                }

                                try
                                {
                                    // Check if the input field already exists.
                                    tagKey = convert2AttributeFieldName(nameOfTag, illegalCharacters);

                                    int fieldIndex = osmInputTable.FindField(tagKey);

                                    if (fieldIndex < 0)
                                    {
                                        // generate a new attribute field
                                        IFieldEdit fieldEdit = new FieldClass();
                                        fieldEdit.Name_2      = tagKey;
                                        fieldEdit.AliasName_2 = nameOfTag + resourceManager.GetString("GPTools_OSMGPAttributeSelector_aliasaddition");
                                        fieldEdit.Type_2      = esriFieldType.esriFieldTypeString;
                                        fieldEdit.Length_2    = 100;

                                        osmInputTable.AddField(fieldEdit);

                                        message.AddMessage(string.Format(resourceManager.GetString("GPTools_OSMGPAttributeSelector_addField"), tagKey, nameOfTag));

                                        // re-generate the attribute index
                                        fieldIndex = osmInputTable.FindField(tagKey);
                                    }

                                    if (fieldIndex > 0)
                                    {
                                        tagsAttributesIndices.Add(nameOfTag, fieldIndex);
                                        attributeFieldLength.Add(fieldIndex, osmInputTable.Fields.get_Field(fieldIndex).Length);
                                    }
                                }
                                catch (Exception ex)
                                {
                                    // the key is already there, this might result because from multiple upper and lower-case combinations of the same key
                                    message.AddWarning(ex.Message + " (" + convert2OSMKey(tagKey, illegalCharacters) + ")");
                                }
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        message.AddWarning(ex.Message);
                    }
                }

                try
                {
                    execute_Utilities.DecodeFeatureLayer(inputOSMGPValue, out osmFeatureClass, out osmQueryFilter);
                    if (osmFeatureClass != null)
                    {
                        if (osmFeatureClass.Extension is IOSMClassExtension)
                        {
                            useUpdateCursor = false;
                        }
                        else
                        {
                            useUpdateCursor = true;
                        }
                    }

                    osmInputTable = osmFeatureClass as ITable;
                }
                catch { }

                try
                {
                    if (osmInputTable == null)
                    {
                        execute_Utilities.DecodeTableView(inputOSMGPValue, out osmInputTable, out osmQueryFilter);
                    }
                }
                catch { }

                if (osmInputTable == null)
                {
                    string errorMessage = String.Format(resourceManager.GetString("GPTools_OSMGPAttributeSelecto_unableopentable"), inputOSMGPValue.GetAsText());
                    message.AddError(120053, errorMessage);
                    return;
                }

                using (ComReleaser comReleaser = new ComReleaser())
                {
                    using (SchemaLockManager lockMgr = new SchemaLockManager(osmInputTable))
                    {
                        // get an update cursor for all the features to process
                        ICursor rowCursor = null;
                        if (useUpdateCursor)
                        {
                            rowCursor = osmInputTable.Update(osmQueryFilter, false);
                        }
                        else
                        {
                            rowCursor = osmInputTable.Search(osmQueryFilter, false);
                        }

                        comReleaser.ManageLifetime(rowCursor);

                        IRow osmRow = null;


                        Dictionary <string, string> tagKeys = new Dictionary <string, string>();
                        int progessIndex = 0;
#if DEBUG
                        message.AddMessage("useUpdateCursor: " + useUpdateCursor.ToString());
#endif

                        // as long as there are features....
                        while ((osmRow = rowCursor.NextRow()) != null)
                        {
                            // retrieve the tags of the current feature
                            tag[] storedTags = _osmUtility.retrieveOSMTags(osmRow, osmTagCollectionFieldIndex, ((IDataset)osmInputTable).Workspace);

                            bool rowChanged = false;
                            if (storedTags != null)
                            {
                                foreach (tag tagItem in storedTags)
                                {
                                    // Check for matching values so we only change a minimum number of rows
                                    if (tagsAttributesIndices.ContainsKey(tagItem.k))
                                    {
                                        int fieldIndex = tagsAttributesIndices[tagItem.k];

                                        //...then stored the value in the attribute field
                                        // ensure that the content of the tag actually does fit into the field length...otherwise do truncate it
                                        string tagValue = tagItem.v;

                                        int fieldLength = attributeFieldLength[fieldIndex];

                                        if (tagValue.Length > fieldLength)
                                        {
                                            tagValue = tagValue.Substring(0, fieldLength);
                                        }

                                        osmRow.set_Value(fieldIndex, tagValue);
                                        rowChanged = true;
                                    }
                                    else
                                    {
#if DEBUG
                                        //message.AddWarning(tagItem.k);
#endif
                                    }
                                }
                            }

                            storedTags = null;

                            try
                            {
                                if (rowChanged)
                                {
                                    if (useUpdateCursor)
                                    {
                                        rowCursor.UpdateRow(osmRow);
                                    }
                                    else
                                    {
                                        // update the feature through the cursor
                                        osmRow.Store();
                                    }
                                }
                                progessIndex++;
                            }
                            catch (Exception ex)
                            {
                                System.Diagnostics.Debug.WriteLine(ex.Message);
                                message.AddWarning(ex.Message);
                            }

                            if (osmRow != null)
                            {
                                Marshal.ReleaseComObject(osmRow);
                            }

                            if (stepProgressor != null)
                            {
                                // update the progress UI
                                stepProgressor.Position = progessIndex;
                            }

                            // check for user cancellation (every 100 rows)
                            if ((progessIndex % 100 == 0) && (TrackCancel.Continue() == false))
                            {
                                return;
                            }
                        }

                        if (stepProgressor != null)
                        {
                            stepProgressor.Hide();
                        }
                    }
                }

                execute_Utilities.ReleaseInternals();
                Marshal.ReleaseComObject(execute_Utilities);
            }
            catch (Exception ex)
            {
                message.AddError(120054, ex.Message);
            }
        }
Exemplo n.º 2
0
        public void Execute(ESRI.ArcGIS.esriSystem.IArray paramvalues, ESRI.ArcGIS.esriSystem.ITrackCancel TrackCancel, ESRI.ArcGIS.Geoprocessing.IGPEnvironmentManager envMgr, ESRI.ArcGIS.Geodatabase.IGPMessages message)
        {
            try
            {
                IGPUtilities3 execute_Utilities = new GPUtilitiesClass();

                if (TrackCancel == null)
                {
                    TrackCancel = new CancelTrackerClass();
                }

                IGPParameter inputFeatureDatasetParameter = paramvalues.get_Element(in_featureDatasetParameterNumber) as IGPParameter;
                IGPValue inputFeatureDatasetGPValue = execute_Utilities.UnpackGPValue(inputFeatureDatasetParameter);
                IGPValue outputOSMFileGPValue = execute_Utilities.UnpackGPValue(paramvalues.get_Element(out_osmFileLocationParameterNumber));

                // get the name of the feature dataset
                int fdDemlimiterPosition = inputFeatureDatasetGPValue.GetAsText().LastIndexOf("\\");

                string nameOfFeatureDataset = inputFeatureDatasetGPValue.GetAsText().Substring(fdDemlimiterPosition + 1);


                XmlWriterSettings settings = new XmlWriterSettings();
                settings.Indent = true;

                System.Xml.XmlWriter xmlWriter = null;

                try
                {
                    xmlWriter = XmlWriter.Create(outputOSMFileGPValue.GetAsText(), settings);
                }
                catch (Exception ex)
                {
                    message.AddError(120021, ex.Message);
                    return;
                }

                xmlWriter.WriteStartDocument();
                xmlWriter.WriteStartElement("osm"); // start the osm root node
                xmlWriter.WriteAttributeString("version", "0.6"); // add the version attribute
                xmlWriter.WriteAttributeString("generator", "ArcGIS Editor for OpenStreetMap"); // add the generator attribute

                // write all the nodes
                // use a feature search cursor to loop through all the known points and write them out as osm node

                IFeatureClassContainer osmFeatureClasses = execute_Utilities.OpenDataset(inputFeatureDatasetGPValue) as IFeatureClassContainer;

                if (osmFeatureClasses == null)
                {
                    message.AddError(120022, string.Format(resourceManager.GetString("GPTools_NullPointerParameterType"), inputFeatureDatasetParameter.Name));
                    return;
                }

                IFeatureClass osmPointFeatureClass = osmFeatureClasses.get_ClassByName(nameOfFeatureDataset + "_osm_pt");

                if (osmPointFeatureClass == null)
                {
                    message.AddError(120023, string.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_no_pointfeatureclass"), nameOfFeatureDataset + "_osm_pt"));
                    return;
                }

                // check the extension of the point feature class to determine its version
                int internalOSMExtensionVersion = osmPointFeatureClass.OSMExtensionVersion();

                IFeatureCursor searchCursor = null;

                System.Xml.Serialization.XmlSerializerNamespaces xmlnsEmpty = new System.Xml.Serialization.XmlSerializerNamespaces();
                xmlnsEmpty.Add("", "");

                message.AddMessage(resourceManager.GetString("GPTools_OSMGPExport2OSM_exporting_pts_msg"));
                int pointCounter = 0;

                string nodesExportedMessage = String.Empty;

                // collect the indices for the point feature class once
                int pointOSMIDFieldIndex = osmPointFeatureClass.Fields.FindField("OSMID");
                int pointChangesetFieldIndex = osmPointFeatureClass.Fields.FindField("osmchangeset");
                int pointVersionFieldIndex = osmPointFeatureClass.Fields.FindField("osmversion");
                int pointUIDFieldIndex = osmPointFeatureClass.Fields.FindField("osmuid");
                int pointUserFieldIndex = osmPointFeatureClass.Fields.FindField("osmuser");
                int pointTimeStampFieldIndex = osmPointFeatureClass.Fields.FindField("osmtimestamp");
                int pointVisibleFieldIndex = osmPointFeatureClass.Fields.FindField("osmvisible");
                int pointTagsFieldIndex = osmPointFeatureClass.Fields.FindField("osmTags");

                using (ComReleaser comReleaser = new ComReleaser())
                {
                    searchCursor = osmPointFeatureClass.Search(null, false);
                    comReleaser.ManageLifetime(searchCursor);

                    System.Xml.Serialization.XmlSerializer pointSerializer = new System.Xml.Serialization.XmlSerializer(typeof(node));

                    IFeature currentFeature = searchCursor.NextFeature();

                    IWorkspace pointWorkspace = ((IDataset)osmPointFeatureClass).Workspace;

                    while (currentFeature != null)
                    {
                        if (TrackCancel.Continue() == true)
                        {
                            // convert the found point feature into a osm node representation to store into the OSM XML file
                            node osmNode = ConvertPointFeatureToOSMNode(currentFeature, pointWorkspace, pointTagsFieldIndex, pointOSMIDFieldIndex, pointChangesetFieldIndex, pointVersionFieldIndex, pointUIDFieldIndex, pointUserFieldIndex, pointTimeStampFieldIndex, pointVisibleFieldIndex, internalOSMExtensionVersion);

                            pointSerializer.Serialize(xmlWriter, osmNode, xmlnsEmpty);

                            // increase the point counter to later status report
                            pointCounter++;

                            currentFeature = searchCursor.NextFeature();
                        }
                        else
                        {
                            // properly close the document
                            xmlWriter.WriteEndElement(); // closing the osm root element
                            xmlWriter.WriteEndDocument(); // finishing the document

                            xmlWriter.Close(); // closing the document

                            // report the number of elements loader so far
                            nodesExportedMessage = String.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_pts_exported_msg"), pointCounter);
                            message.AddMessage(nodesExportedMessage);

                            return;
                        }
                    }
                }

                nodesExportedMessage = String.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_pts_exported_msg"), pointCounter);
                message.AddMessage(nodesExportedMessage);

                // next loop through the line and polygon feature classes to export those features as ways
                // in case we encounter a multi-part geometry, store it in a relation collection that will be serialized when exporting the relations table
                IFeatureClass osmLineFeatureClass = osmFeatureClasses.get_ClassByName(nameOfFeatureDataset + "_osm_ln");

                if (osmLineFeatureClass == null)
                {
                    message.AddError(120023, string.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_no_linefeatureclass"), nameOfFeatureDataset + "_osm_ln"));
                    return;
                }

                message.AddMessage(resourceManager.GetString("GPTools_OSMGPExport2OSM_exporting_ways_msg"));

                // as we are looping through the line and polygon feature classes let's collect the multi-part features separately 
                // as they are considered relations in the OSM world
                List<relation> multiPartElements = new List<relation>();

                System.Xml.Serialization.XmlSerializer waySerializer = new System.Xml.Serialization.XmlSerializer(typeof(way));
                int lineCounter = 0;
                int relationCounter = 0;
                string waysExportedMessage = String.Empty;

                using (ComReleaser comReleaser = new ComReleaser())
                {
                    searchCursor = osmLineFeatureClass.Search(null, false);
                    comReleaser.ManageLifetime(searchCursor);

                    IFeature currentFeature = searchCursor.NextFeature();

                    // collect the indices for the point feature class once
                    int lineOSMIDFieldIndex = osmLineFeatureClass.Fields.FindField("OSMID");
                    int lineChangesetFieldIndex = osmLineFeatureClass.Fields.FindField("osmchangeset");
                    int lineVersionFieldIndex = osmLineFeatureClass.Fields.FindField("osmversion");
                    int lineUIDFieldIndex = osmLineFeatureClass.Fields.FindField("osmuid");
                    int lineUserFieldIndex = osmLineFeatureClass.Fields.FindField("osmuser");
                    int lineTimeStampFieldIndex = osmLineFeatureClass.Fields.FindField("osmtimestamp");
                    int lineVisibleFieldIndex = osmLineFeatureClass.Fields.FindField("osmvisible");
                    int lineTagsFieldIndex = osmLineFeatureClass.Fields.FindField("osmTags");
                    int lineMembersFieldIndex = osmLineFeatureClass.Fields.FindField("osmMembers");

                    IWorkspace lineWorkspace = ((IDataset)osmLineFeatureClass).Workspace;

                    while (currentFeature != null)
                    {
                        if (TrackCancel.Continue() == false)
                        {
                            // properly close the document
                            xmlWriter.WriteEndElement(); // closing the osm root element
                            xmlWriter.WriteEndDocument(); // finishing the document

                            xmlWriter.Close(); // closing the document

                            // report the number of elements loaded so far
                            waysExportedMessage = String.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_ways_exported_msg"), lineCounter);
                            message.AddMessage(waysExportedMessage);

                            return;
                        }

                        //test if the feature geometry has multiple parts
                        IGeometryCollection geometryCollection = currentFeature.Shape as IGeometryCollection;

                        if (geometryCollection != null)
                        {
                            if (geometryCollection.GeometryCount == 1)
                            {
                                // convert the found polyline feature into a osm way representation to store into the OSM XML file
                                way osmWay = ConvertFeatureToOSMWay(currentFeature, lineWorkspace, osmPointFeatureClass, pointOSMIDFieldIndex, lineTagsFieldIndex, lineOSMIDFieldIndex, lineChangesetFieldIndex, lineVersionFieldIndex, lineUIDFieldIndex, lineUserFieldIndex, lineTimeStampFieldIndex, lineVisibleFieldIndex, internalOSMExtensionVersion);
                                waySerializer.Serialize(xmlWriter, osmWay, xmlnsEmpty);

                                // increase the line counter for later status report
                                lineCounter++;
                            }
                            else
                            {
                                relation osmRelation = ConvertRowToOSMRelation((IRow)currentFeature, lineWorkspace, lineTagsFieldIndex, lineOSMIDFieldIndex, lineChangesetFieldIndex, lineVersionFieldIndex, lineUIDFieldIndex, lineUserFieldIndex, lineTimeStampFieldIndex, lineVisibleFieldIndex, lineMembersFieldIndex, internalOSMExtensionVersion);
                                multiPartElements.Add(osmRelation);

                                // increase the line counter for later status report
                                relationCounter++;
                            }
                        }

                        currentFeature = searchCursor.NextFeature();
                    }
                }


                IFeatureClass osmPolygonFeatureClass = osmFeatureClasses.get_ClassByName(nameOfFeatureDataset + "_osm_ply");
                IFeatureWorkspace commonWorkspace = ((IDataset)osmPolygonFeatureClass).Workspace as IFeatureWorkspace;

                if (osmPolygonFeatureClass == null)
                {
                    message.AddError(120024, string.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_no_polygonfeatureclass"), nameOfFeatureDataset + "_osm_ply"));
                    return;
                }

                using (ComReleaser comReleaser = new ComReleaser())
                {
                    searchCursor = osmPolygonFeatureClass.Search(null, false);
                    comReleaser.ManageLifetime(searchCursor);

                    IFeature currentFeature = searchCursor.NextFeature();

                    // collect the indices for the point feature class once
                    int polygonOSMIDFieldIndex = osmPolygonFeatureClass.Fields.FindField("OSMID");
                    int polygonChangesetFieldIndex = osmPolygonFeatureClass.Fields.FindField("osmchangeset");
                    int polygonVersionFieldIndex = osmPolygonFeatureClass.Fields.FindField("osmversion");
                    int polygonUIDFieldIndex = osmPolygonFeatureClass.Fields.FindField("osmuid");
                    int polygonUserFieldIndex = osmPolygonFeatureClass.Fields.FindField("osmuser");
                    int polygonTimeStampFieldIndex = osmPolygonFeatureClass.Fields.FindField("osmtimestamp");
                    int polygonVisibleFieldIndex = osmPolygonFeatureClass.Fields.FindField("osmvisible");
                    int polygonTagsFieldIndex = osmPolygonFeatureClass.Fields.FindField("osmTags");
                    int polygonMembersFieldIndex = osmPolygonFeatureClass.Fields.FindField("osmMembers");

                    IWorkspace polygonWorkspace = ((IDataset)osmPolygonFeatureClass).Workspace;

                    while (currentFeature != null)
                    {
                        if (TrackCancel.Continue() == false)
                        {
                            // properly close the document
                            xmlWriter.WriteEndElement(); // closing the osm root element
                            xmlWriter.WriteEndDocument(); // finishing the document

                            xmlWriter.Close(); // closing the document

                            // report the number of elements loaded so far
                            waysExportedMessage = String.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_ways_exported_msg"), lineCounter);
                            message.AddMessage(waysExportedMessage);

                            message.AddAbort(resourceManager.GetString("GPTools_toolabort"));
                            return;
                        }

                        //test if the feature geometry has multiple parts
                        IGeometryCollection geometryCollection = currentFeature.Shape as IGeometryCollection;

                        if (geometryCollection != null)
                        {
                            if (geometryCollection.GeometryCount == 1)
                            {
                                // convert the found polyline feature into a osm way representation to store into the OSM XML file
                                way osmWay = ConvertFeatureToOSMWay(currentFeature, polygonWorkspace, osmPointFeatureClass, pointOSMIDFieldIndex, polygonTagsFieldIndex, polygonOSMIDFieldIndex, polygonChangesetFieldIndex, polygonVersionFieldIndex, polygonUIDFieldIndex, polygonUserFieldIndex, polygonTimeStampFieldIndex, polygonVisibleFieldIndex, internalOSMExtensionVersion);
                                waySerializer.Serialize(xmlWriter, osmWay, xmlnsEmpty);

                                // increase the line counter for later status report
                                lineCounter++;
                            }
                            else
                            {
                                relation osmRelation = ConvertRowToOSMRelation((IRow)currentFeature, polygonWorkspace, polygonTagsFieldIndex, polygonOSMIDFieldIndex, polygonChangesetFieldIndex, polygonVersionFieldIndex, polygonUIDFieldIndex, polygonUserFieldIndex, polygonTimeStampFieldIndex, polygonVisibleFieldIndex, polygonMembersFieldIndex, internalOSMExtensionVersion);
                                multiPartElements.Add(osmRelation);

                                // increase the line counter for later status report
                                relationCounter++;
                            }
                        }

                        currentFeature = searchCursor.NextFeature();
                    }
                }

                waysExportedMessage = String.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_ways_exported_msg"), lineCounter);
                message.AddMessage(waysExportedMessage);


                // now let's go through the relation table 
                message.AddMessage(resourceManager.GetString("GPTools_OSMGPExport2OSM_exporting_relations_msg"));
                ITable relationTable = commonWorkspace.OpenTable(nameOfFeatureDataset + "_osm_relation");

                if (relationTable == null)
                {
                    message.AddError(120025, String.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_no_relationTable"), nameOfFeatureDataset + "_osm_relation"));
                    return;
                }


                System.Xml.Serialization.XmlSerializer relationSerializer = new System.Xml.Serialization.XmlSerializer(typeof(relation));
                string relationsExportedMessage = String.Empty;

                using (ComReleaser comReleaser = new ComReleaser())
                {
                    ICursor rowCursor = relationTable.Search(null, false);
                    comReleaser.ManageLifetime(rowCursor);

                    IRow currentRow = rowCursor.NextRow();

                    // collect the indices for the relation table once
                    int relationOSMIDFieldIndex = relationTable.Fields.FindField("OSMID");
                    int relationChangesetFieldIndex = relationTable.Fields.FindField("osmchangeset");
                    int relationVersionFieldIndex = relationTable.Fields.FindField("osmversion");
                    int relationUIDFieldIndex = relationTable.Fields.FindField("osmuid");
                    int relationUserFieldIndex = relationTable.Fields.FindField("osmuser");
                    int relationTimeStampFieldIndex = relationTable.Fields.FindField("osmtimestamp");
                    int relationVisibleFieldIndex = relationTable.Fields.FindField("osmvisible");
                    int relationTagsFieldIndex = relationTable.Fields.FindField("osmTags");
                    int relationMembersFieldIndex = relationTable.Fields.FindField("osmMembers");

                    IWorkspace polygonWorkspace = ((IDataset)osmPolygonFeatureClass).Workspace;


                    while (currentRow != null)
                    {
                        if (TrackCancel.Continue() == false)
                        {
                            // properly close the document
                            xmlWriter.WriteEndElement(); // closing the osm root element
                            xmlWriter.WriteEndDocument(); // finishing the document

                            xmlWriter.Close(); // closing the document

                            // report the number of elements loaded so far
                            relationsExportedMessage = String.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_relations_exported_msg"), relationCounter);
                            message.AddMessage(relationsExportedMessage);

                            message.AddAbort(resourceManager.GetString("GPTools_toolabort"));
                            return;
                        }

                        relation osmRelation = ConvertRowToOSMRelation(currentRow, (IWorkspace)commonWorkspace, relationTagsFieldIndex, relationOSMIDFieldIndex, relationChangesetFieldIndex, relationVersionFieldIndex, relationUIDFieldIndex, relationUserFieldIndex, relationTimeStampFieldIndex, relationVisibleFieldIndex, relationMembersFieldIndex, internalOSMExtensionVersion);
                        relationSerializer.Serialize(xmlWriter, osmRelation, xmlnsEmpty);

                        // increase the line counter for later status report
                        relationCounter++;

                        currentRow = rowCursor.NextRow();
                    }
                }

                // lastly let's serialize the collected multipart-geometries back into relation elements
                foreach (relation currentRelation in multiPartElements)
                {
                    if (TrackCancel.Continue() == false)
                    {
                        // properly close the document
                        xmlWriter.WriteEndElement(); // closing the osm root element
                        xmlWriter.WriteEndDocument(); // finishing the document

                        xmlWriter.Close(); // closing the document

                        // report the number of elements loaded so far
                        relationsExportedMessage = String.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_relations_exported_msg"), relationCounter);
                        message.AddMessage(relationsExportedMessage);

                        return;
                    }

                    relationSerializer.Serialize(xmlWriter, currentRelation, xmlnsEmpty);
                    relationCounter++;
                }

                relationsExportedMessage = String.Format(resourceManager.GetString("GPTools_OSMGPExport2OSM_relations_exported_msg"), relationCounter);
                message.AddMessage(relationsExportedMessage);


                xmlWriter.WriteEndElement(); // closing the osm root element
                xmlWriter.WriteEndDocument(); // finishing the document

                xmlWriter.Close(); // closing the document
            }
            catch (Exception ex)
            {
                message.AddError(11111, ex.StackTrace);
                message.AddError(120026, ex.Message);
            }
        }