Application: gvSIG desktop » gvSIG data provider for WFS

/* gvSIG. Geographic Information System of the Valencian Government

 *

 * Copyright (C) 2007-2008 Infrastructures and Transports Department

 * of the Valencian Government (CIT)

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 */

/*

 * AUTHORS (In addition to CIT):

 * 2009 {Iver T.I.}   {Task}

 */

package org.gvsig.fmap.dal.store.wfs;

import java.awt.geom.AffineTransform;

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import org.cresques.cts.ICoordTrans;

import org.cresques.cts.IProjection;

import org.gvsig.fmap.crs.CRSFactory;

import org.gvsig.fmap.dal.DALLocator;

import org.gvsig.fmap.dal.DataManager;

import org.gvsig.fmap.dal.DataServerExplorer;

import org.gvsig.fmap.dal.DataStoreParameters;

import org.gvsig.fmap.dal.DataTypes;

import org.gvsig.fmap.dal.exception.ConnectionServerException;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.exception.InitializeException;

import org.gvsig.fmap.dal.exception.OpenException;

import org.gvsig.fmap.dal.exception.ProviderNotRegisteredException;

import org.gvsig.fmap.dal.exception.ReadException;

import org.gvsig.fmap.dal.feature.EditableFeatureAttributeDescriptor;

import org.gvsig.fmap.dal.feature.EditableFeatureType;

import org.gvsig.fmap.dal.feature.FeatureQuery;

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.dal.feature.FeatureType;

import org.gvsig.fmap.dal.feature.spi.AbstractFeatureStoreProvider;

import org.gvsig.fmap.dal.feature.spi.FeatureProvider;

import org.gvsig.fmap.dal.feature.spi.FeatureReferenceProviderServices;

import org.gvsig.fmap.dal.feature.spi.FeatureSetProvider;

import org.gvsig.fmap.dal.resource.spi.ResourceProvider;

import org.gvsig.fmap.dal.serverexplorer.wfs.WFSServerExplorer;

import org.gvsig.fmap.dal.serverexplorer.wfs.WFSServerExplorerParameters;

import org.gvsig.fmap.dal.spi.DataStoreProviderServices;

import org.gvsig.fmap.dal.store.gpe.GPEStoreProvider;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.Geometry.SUBTYPES;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

import org.gvsig.fmap.geom.exception.CreateEnvelopeException;

import org.gvsig.fmap.geom.operation.GeometryOperationException;

import org.gvsig.fmap.geom.operation.GeometryOperationNotSupportedException;

import org.gvsig.fmap.geom.primitive.Envelope;

import org.gvsig.gpe.lib.api.exceptions.WriterHandlerCreationException;

import org.gvsig.metadata.MetadataLocator;

import org.gvsig.metadata.MetadataManager;

import org.gvsig.metadata.exceptions.MetadataException;

import org.gvsig.remoteclient.ogc.OGCClientOperation;

import org.gvsig.remoteclient.utils.BoundaryBox;

import org.gvsig.remoteclient.wfs.WFSClient;

import org.gvsig.remoteclient.wfs.WFSFeature;

import org.gvsig.remoteclient.wfs.WFSFeatureField;

import org.gvsig.remoteclient.wfs.WFSStatus;

import org.gvsig.remoteclient.wfs.exceptions.WFSException;

import org.gvsig.remoteclient.wfs.request.WFSGetFeatureRequestInformation;

import org.gvsig.remoteclient.wfs.request.WFSTransactionRequestInformation;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dynobject.DynStruct;

import org.gvsig.xmlschema.lib.api.XMLSchemaLocator;

import org.gvsig.xmlschema.lib.api.XMLSchemaManager;

import org.gvsig.xmlschema.lib.api.som.IXSGeometryTypeDefinition;

import org.gvsig.xmlschema.lib.api.som.IXSTypeDefinition;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * @author <a href="mailto:jpiera@gvsig.org">Jorge Piera</a>

 */

public class WFSStoreProvider extends AbstractFeatureStoreProvider {

        private static final Logger logger = LoggerFactory

                        .getLogger(WFSStoreProvider.class);

        public static String NAME = "WFSStore";

        public static String DESCRIPTION = "WFS store to load WFS resources";

        private static final MetadataManager metadataManager = MetadataLocator

                        .getMetadataManager();

        private static final String METADATA_DEFINITION_NAME = "WFSStore";

        private static final String METADATA_DEFINITION_DESCRIPTION = "WFSStore metadata definition";

        // private IProjection projection;

        private long featureCount = -1;

        private boolean isKnownEnvelope = false;

        /**

         * If the user has selected the filter by area option

         */

        private boolean hasFilterByArea = false;

        /**

         * GML provider used by delegation to read the GML files

         */

        private GPEStoreProvider storeProviderDelegate = null;

        private static final DataManager dataManager = DALLocator.getDataManager();

        private static final XMLSchemaManager xmlSchemaManager = XMLSchemaLocator

                        .getXMLSchemaManager();

        boolean isFilterByAreaSupported = true;

        // WFS Parameters

        private WFSClient wfsClient;

        private WFSStatus wfsStatus;

        public WFSStoreProvider(DataStoreParameters params,

                        DataStoreProviderServices storeServices) throws InitializeException {

                super(

                                params,

                                storeServices,

                                ToolsLocator

                                                .getDynObjectManager()

                                                .createDynObject(

                                                                metadataManager

                                                                                .getDefinition(METADATA_DEFINITION_NAME)));

                initParams();

                try {

                        initFeatureType();

                } catch (WFSException e) {

                        throw new InitializeException(e);

                } catch (ReadException e) {

                        throw new InitializeException(e);

                }

        }

        private void initParams() throws InitializeException {

                try {

                        WFSOpenStoreParameters wfsParameters = getWFSParameters();

                        try {

                                if (wfsParameters.getVersion() == null) {

                                        wfsClient = new WFSClient(wfsParameters.getUrl(),

                                                        wfsParameters.getIgnoreCache());

                                        wfsParameters.setVersion(wfsClient.getVersion());

                                } else {

                                        wfsClient = new WFSClient(wfsParameters.getUrl(),

                                                        wfsParameters.getVersion(),

                                                        wfsParameters.getIgnoreCache());

                                }

                        } catch (IOException e) {

                                throw new InitializeException(e);

                        }

                        wfsStatus = new WFSStatus(wfsParameters.getFeatureType(),

                                        wfsParameters.getFeatureNamespace());

                        wfsStatus.setNamespacePrefix(wfsParameters.getFeaturePrefix());

                        wfsStatus.setFields(wfsParameters.getFields());

                        // Select the filter by area

                        Geometry filterByAreaGeometry = wfsParameters

                                        .getFilterByAreaGeometry();

                        Envelope filterByAreaEnvelope = wfsParameters

                                        .getFilterByAreaEnvelope();

                        if (filterByAreaGeometry != null) {

                                wfsStatus.setFilterByArea(filterByAreaGeometry,

                                                wfsParameters.getFilterByAreaAttribute(),

                                                wfsParameters.getFilterByAreaCrs().getFullCode(),

                                                wfsParameters.getFilterByAreaOperation());

                        } else if (filterByAreaEnvelope != null) {

                                wfsStatus.setFilterByArea(filterByAreaEnvelope,

                                                wfsParameters.getFilterByAreaAttribute(),

                                                wfsParameters.getFilterByAreaCrs().getFullCode(),

                                                wfsParameters.getFilterByAreaOperation());

                        }

                        this.hasFilterByArea = (wfsStatus.getFilterByArea() != null);

                        // Select the filter by attribute

                        wfsStatus.setFilterByAttribute(wfsParameters

                                        .getFilterEncodingByAttribute());

                        String _srs = wfsParameters.getCrs();

                        wfsStatus.setSrs(_srs);

                        wfsStatus.setTimeout(wfsParameters.getTimeOut());

                        wfsStatus.setMaxFeatures(wfsParameters.getMaxFeatures());

                        wfsStatus.setUserName(wfsParameters.getUser());

                        wfsStatus.setPassword(wfsParameters.getPassword());

                        // Setting the envelope for the layer

                        wfsClient.getCapabilities(wfsStatus, false, null);

                        Envelope envelope = calculateFullEnvelope();

                        if (envelope != null) {

                                this.setDynValue("Envelope", envelope);

                                isKnownEnvelope = true;

                        }

                } catch (WFSException e) {

                        throw new InitializeException("Impossible to retrieve the file", e);

                }

        }

        private WFSFeature getSelectedWFSFeature() throws ReadException,

                        WFSException {

                WFSOpenStoreParameters wfsParameters = getWFSParameters();

                return ((WFSServerExplorer) getExplorer()).getFeatureInfo(

                                wfsParameters.getFeatureNamespace(),

                                wfsParameters.getFeatureType());

        }

        private void initFeatureType() throws WFSException, ReadException {

                WFSFeature feature = getSelectedWFSFeature();

                if (feature == null) {

                        // TODO read from GML

                        throw new WFSException("It is not possible to parse the schema");

                }

                IProjection ipro = null;

                try {

                        ipro = CRSFactory.getCRS(wfsStatus.getSrs());

                        this.setDynValue("CRS", ipro);

                } catch (Exception ex) {

                        logger.info("Error: did not set CRS in store provider.", ex);

                }

                EditableFeatureType featureType = getStoreServices()

                                .createFeatureType();

                for (int i = 0; i < feature.getFieldSize(); i++) {

                        WFSFeatureField featureField = feature.getFieldAt(i);

                        int dataType = DataTypes.STRING;

                        String typeName = featureField.getType();

                        EditableFeatureAttributeDescriptor attributeDescriptor = null;

                        IXSTypeDefinition typeDefinition = null;

                        if (typeName != null) {

                                typeDefinition = xmlSchemaManager.getTypeDefinition(typeName);

                        }

                        if (typeDefinition != null) {

                                if (typeDefinition.getDataType() != null) {

                                        if (typeDefinition.getDataType().getType() == DataTypes.GEOMETRY) {

                                                dataType = typeDefinition.getDataType().getType();

                                        }

                                }

                                attributeDescriptor = featureType.add(featureField.getName(),

                                                dataType);

                                if (typeDefinition instanceof IXSGeometryTypeDefinition) {

                                        if (ipro != null) {

                                                attributeDescriptor.setSRS(ipro);

                                        } else {

                                                if (feature.getSrs().size() > 0) {

                                                        attributeDescriptor.setSRS(CRSFactory

                                                                        .getCRS((String) feature.getSrs().get(0)));

                                                } else {

                                                        logger.info("Unable to set CRS in feature type.");

                                                }

                                        }

                                        attributeDescriptor

                                                        .setGeometryType(((IXSGeometryTypeDefinition) typeDefinition)

                                                                        .getGeometryType());

                                        attributeDescriptor.setGeometrySubType(SUBTYPES.GEOM3D);

                                        featureType.setDefaultGeometryAttributeName(featureField

                                                        .getName());

                                }

                        } else {

                                attributeDescriptor = featureType.add(typeName, dataType);

                        }

                        // length, relevant for all (strings) except geometry

                        attributeDescriptor.setSize(128);

                }

                featureType.setHasOID(true);

                FeatureType defaultType = featureType.getNotEditableCopy();

                List types = new ArrayList(1);

                types.add(defaultType);

                this.getStoreServices().setFeatureTypes(types, defaultType);

        }

        private Envelope calculateFullEnvelope() {

                GeometryManager geometryManager = GeometryLocator.getGeometryManager();

                try {

                        WFSFeature feature = getSelectedWFSFeature();

                        if (feature != null) {

                                String _srs = wfsStatus.getSrs();

                                if (_srs != null) {

                                        BoundaryBox boundaryBox = feature.getBbox(_srs);

                                        // The projection is found

                                        if (boundaryBox != null) {

                                                return geometryManager.createEnvelope(

                                                                boundaryBox.getXmin(), boundaryBox.getYmin(),

                                                                boundaryBox.getXmax(), boundaryBox.getYmax(),

                                                                SUBTYPES.GEOM2D);

                                        }

                                        // Check if there is a latlon envelope

                                        boundaryBox = feature.getLatLonBbox();

                                        if (boundaryBox != null) {

                                                Envelope envelope = geometryManager.createEnvelope(

                                                                boundaryBox.getXmin(), boundaryBox.getYmin(),

                                                                boundaryBox.getXmax(), boundaryBox.getYmax(),

                                                                SUBTYPES.GEOM2D);

                                                if (!"EPSG:4326".equals(_srs)) {

                                                        IProjection sourceProjection = CRSFactory

                                                                        .getCRS("EPSG:4326");

                                                        IProjection destinationProjection = CRSFactory

                                                                        .getCRS(_srs);

                                                        if (destinationProjection != null) {

                                                                ICoordTrans coordTrans = sourceProjection

                                                                                .getCT(destinationProjection);

                                                                return envelope.convert(coordTrans);

                                                        }

                                                }

                                        }

                                } else {

                                        // If there is not a SRS is thrown a request for the first

                                        // 500 features

                                        int odlMaxFeatures = wfsStatus.getMaxFeatures();

                                        wfsStatus.setMaxFeatures(500);

                                        createSet(null, null);

                                        return storeProviderDelegate.getEnvelope();

                                }

                        }

                } catch (CreateEnvelopeException e) {

                        logger.error("Impossible to create an envelope", e);

                } catch (ReadException e) {

                        logger.error("Impossible to create an envelope", e);

                } catch (WFSException e) {

                        logger.error("Impossible to create an envelope", e);

                } catch (DataException e) {

                        logger.error("Impossible to create an envelope", e);

                }

                return null;

        }

        private WFSOpenStoreParameters getWFSParameters() {

                return (WFSOpenStoreParameters) getParameters();

        }

        /*

         * (non-Javadoc)

         *

         * @see org.gvsig.fmap.dal.store.gpe.GPEStoreProvider#open()

         */

        public void open() throws OpenException {

                try {

                        List featureTypes = this.getFeatureStore().getFeatureTypes();

                        for (int i = 0; i < featureTypes.size(); i++) {

                                FeatureType featureType = (FeatureType) featureTypes.get(i);

                        }

                } catch (DataException e) {

                        throw new OpenException("Reading the geometry type", e);

                }

        }

        protected static void registerMetadataDefinition() throws MetadataException {

                if (metadataManager.getDefinition(METADATA_DEFINITION_NAME) == null) {

                        DynStruct metadataDefinition = metadataManager.addDefinition(

                                        METADATA_DEFINITION_NAME, METADATA_DEFINITION_DESCRIPTION);

                        metadataDefinition.addDynFieldObject("Envelope")

                                        .setClassOfValue(Envelope.class).setMandatory(false);

                        metadataDefinition.addDynFieldObject("CRS")

                                        .setClassOfValue(IProjection.class).setMandatory(true);

                        metadataDefinition.extend(metadataManager

                                        .getDefinition(FeatureStore.METADATA_DEFINITION_NAME));

                }

        }

        /*

         * (non-Javadoc)

         *

         * @see

         * org.gvsig.fmap.dal.feature.spi.AbstractFeatureStoreProvider#getExplorer()

         */

        public DataServerExplorer getExplorer() throws ReadException {

                DataManager manager = DALLocator.getDataManager();

                WFSServerExplorerParameters params;

                try {

                        params = (WFSServerExplorerParameters) manager

                                        .createServerExplorerParameters(WFSServerExplorer.NAME);

                        params.setUrl(wfsClient.getHost());

                        return manager.openServerExplorer(WFSServerExplorer.NAME, params);

                } catch (Exception e) {

                        throw new ReadException(this.getName(), e);

                }

        }

        public String getProviderName() {

                return NAME;

        }

        public FeatureSetProvider createSet(FeatureQuery query)

                        throws DataException {

                return createSet(query, null);

        }

        public FeatureSetProvider createSet(FeatureQuery query,

                        FeatureType featureType) throws DataException {

                if ((featureCount == -1) || (storeProviderDelegate == null)

                                || (featureCount >= wfsStatus.getMaxFeatures())) {

                        File file = executeSpatialQuery();

                        storeProviderDelegate = createProvider(file);

                }

                return storeProviderDelegate.createSet(query, featureType);

        }

        /**

         * It creates the provider that is used to retrieve features from a file.

         *

         * @param file

         *            the file that contains the downloaded file

         * @return

         * @throws InitializeException

         * @throws ProviderNotRegisteredException

         */

        private GPEStoreProvider createProvider(File file)

                        throws InitializeException, ProviderNotRegisteredException {

                return new GPEStoreProvider(createStoreParameters(file),

                                getStoreServices());

        }

        private DataStoreParameters createStoreParameters(File file)

                        throws InitializeException, ProviderNotRegisteredException {

                DataStoreParameters parameters = dataManager

                                .createStoreParameters(GPEStoreProvider.NAME);

                parameters.setDynValue("File", file.getAbsolutePath());

                parameters.setDynValue("Envelope", this.getDynValue("Envelope"));

                parameters.setDynValue("useAxisOrderYX", this.getWFSParameters()

                                .getUseAxisOrderYX());

                parameters.setDynValue("Crs", this.getWFSParameters().getCrs());

                return parameters;

        }

        private File executeSpatialQuery() throws DataException {

                try {

                        Envelope filterByAreaEnvelope = getWFSParameters()

                                        .getFilterByAreaEnvelope();

                        Geometry filterByAreaGeometry = getWFSParameters()

                                        .getFilterByAreaGeometry();

                        if (filterByAreaEnvelope != null) {

                                String crs = getWFSParameters().getCrs();

                                String the_geom = getWFSParameters().getFilterByAreaAttribute();

                                int operator = getWFSParameters().getFilterByAreaOperation();

                                IProjection envelopeCrs = this.getWFSParameters().getFilterByAreaCrs();

                                if (!crs.equalsIgnoreCase(envelopeCrs.getFullCode())) {

                                        Envelope envelope = null;

                                        try {

                                                envelope = (Envelope) filterByAreaEnvelope.clone();

                                        } catch (CloneNotSupportedException e) {

                                                // Do nothing

                                        }

                                        ICoordTrans ct = envelopeCrs.getCT(CRSFactory.getCRS(crs));

                                        filterByAreaEnvelope = envelope.convert(ct);

                                }

                                if (this.getWFSParameters().getUseAxisOrderYX()) {

                                        Envelope envelope = null;

                                        try {

                                                envelope = (Envelope) filterByAreaEnvelope.clone();

                                        } catch (CloneNotSupportedException e) {

                                                // Do nothing

                                        }

                                        double x = envelope.getLowerCorner().getX();

                                        envelope.getLowerCorner().setX(

                                                        envelope.getLowerCorner().getY());

                                        envelope.getLowerCorner().setY(x);

                                        x = envelope.getUpperCorner().getX();

                                        envelope.getUpperCorner().setX(

                                                        envelope.getUpperCorner().getY());

                                        envelope.getUpperCorner().setY(x);

                                        filterByAreaEnvelope = envelope;

                                }

                                wfsStatus.setFilterByArea(filterByAreaEnvelope, the_geom, crs,

                                                operator);

                        } else if (filterByAreaGeometry != null) {

                                String crs = getWFSParameters().getCrs();

                                String the_geom = getWFSParameters().getFilterByAreaAttribute();

                                int operator = getWFSParameters().getFilterByAreaOperation();

                                IProjection geometryCrs = this.getWFSParameters().getFilterByAreaCrs();

                                if (!crs.equalsIgnoreCase(geometryCrs.getFullCode())) {

                                        Geometry geom = null;

                                        geom = (Geometry) filterByAreaGeometry.cloneGeometry();

                                        ICoordTrans ct = geometryCrs.getCT(CRSFactory.getCRS(crs));

                                        geom.reProject(ct);

                                        filterByAreaGeometry = geom;

                                }

                                if (this.getWFSParameters().getUseAxisOrderYX()) {

                                        Geometry geom = filterByAreaGeometry.cloneGeometry();

                                        AffineTransform at = new AffineTransform(0, 1, 1, 0, 0, 1);

                                        geom.transform(at);

                                        filterByAreaGeometry = geom;

                                }

                                wfsStatus.setFilterByArea(filterByAreaGeometry, the_geom, crs,

                                                operator);

                        }

                        wfsStatus.setProtocol(OGCClientOperation.PROTOCOL_POST);

                        // If it is not possible to calculate the

                        wfsStatus.setResultType(WFSStatus.RESULTYPE_RESULTS);

                        return wfsClient.getFeature(wfsStatus, getWFSParameters()

                                        .getIgnoreCache(), null);

                } catch (WFSException e) {

                        throw new InitializeException("Impossible to retrieve the file", e);

                }

        }

        public Object getSourceId() {

                StringBuffer sourceID = new StringBuffer(getWFSParameters().getUrl());

                sourceID.append("_" + getWFSParameters().getFeatureType());

                int hash = sourceID.hashCode();

                if (sourceID.length() > 60) {

                        return sourceID.substring(0, 60) + "_" + hash;

                } else {

                        return sourceID.toString() + "_" + hash;

                }

        }

        public Object createNewOID() {

                try {

                        return String.valueOf(getFeatureCount() + 1);

                } catch (DataException e) {

                        return String.valueOf(Math.random());

                }

        }

        public long getFeatureCount() throws DataException {

                if (featureCount == -1) {

                        wfsStatus.setResultType(WFSStatus.RESULTYPE_HITS);

                                // The filter encoding is better supported using POST

                                if (hasFilterByArea) {

                                        wfsStatus.setProtocol(OGCClientOperation.PROTOCOL_POST);

                                } else {

                                        wfsStatus.setProtocol(OGCClientOperation.PROTOCOL_GET);

                                }

                                File file = executeSpatialQuery();

                                featureCount = ((WFSGetFeatureRequestInformation) wfsClient

                                                .getLastWfsRequestInformation()).getNumberOfFeatures();

                                // If the service doesn't support RESULTTYPE_HITS, parse the

                                // file and get the FeatureCount

                                if (featureCount == -1) {

                                        storeProviderDelegate = createProvider(file);

                                        featureCount = storeProviderDelegate.getFeatureCount();

                                }

                }

                return featureCount;

        }

        public int getOIDType() {

                return DataTypes.STRING;

        }

        public ResourceProvider getResource() {

                return storeProviderDelegate.getResource();

        }

        protected FeatureProvider internalGetFeatureProviderByReference(

                        FeatureReferenceProviderServices reference, FeatureType featureType)

                        throws DataException {

                return storeProviderDelegate.internalGetFeatureProviderByReference(

                                reference, featureType);

        }

        public String getFullName() {

                return getWFSParameters().getUrl() + "_"

                                + getWFSParameters().getFeatureType();

        }

        public String getName() {

                return getWFSParameters().getFeatureType();

        }

        public boolean isKnownEnvelope() {

                return isKnownEnvelope;

        }

        public boolean hasRetrievedFeaturesLimit() {

                return true;

        }

        public int getRetrievedFeaturesLimit() {

                // WFS 1.0.0 can not know where is the limit

                if (getWFSParameters().getVersion().equals("1.0.0")) {

                        return 0;

                } else {

                        return wfsClient.getServiceInformation().getMaxFeatures();

                }

        }

        public void performChanges(Iterator deleteds, Iterator inserteds,

                        Iterator updateds, Iterator featureTypesChanged)

                        throws DataException {

                wfsStatus.setProtocol(OGCClientOperation.PROTOCOL_POST);

                WFSTTransactionBuilder transactionBuilder = new WFSTTransactionBuilder(

                                wfsStatus, wfsClient);

                // Create the Query

                try {

                        // Add new features

                        while (inserteds.hasNext()) {

                                transactionBuilder.addInsertFeature((FeatureProvider) inserteds

                                                .next());

                        }

                        // Add deleted features

                        while (deleteds.hasNext()) {

                                transactionBuilder

                                                .addDeleteFeature(internalGetFeatureProviderByReference(

                                                                (FeatureReferenceProviderServices) deleteds

                                                                                .next(), null).getOID().toString());

                                ;

                        }

                        // Add updated features

                        while (updateds.hasNext()) {

                                transactionBuilder.addUpdateFeature((FeatureProvider) updateds

                                                .next());

                        }

                } catch (WriterHandlerCreationException e) {

                        throw new WFSTTRansactionException(e);

                } catch (GeometryOperationNotSupportedException e) {

                        throw new WFSTTRansactionException(e);

                } catch (GeometryOperationException e) {

                        throw new WFSTTRansactionException(e);

                }

                // Send the query to the server

                try {

                        wfsClient.transaction(wfsStatus, true, null);

                        WFSTransactionRequestInformation transactionRequestInformation = (WFSTransactionRequestInformation) wfsClient

                                        .getLastWfsRequestInformation();

                        if (transactionRequestInformation.getStatus() == WFSTransactionRequestInformation.STATUS_FAILED) {

                                throw new WFSTTRansactionException(

                                                transactionRequestInformation.getMessage());

                        }

                } catch (WFSException e) {

                        throw new WFSTTRansactionException(e);

                }

        }

        public boolean allowWrite() {

                return wfsClient.getServiceInformation().isOperationSupported(

                                "Transaction");

        }

        public Envelope getEnvelope() throws DataException {

                return (Envelope) this.getDynValue("Envelope");

        }

        public FeatureProvider createFeatureProvider(FeatureType type)

                        throws DataException {

                return super.createFeatureProvider(type);

        }

}