Application: gvSIG desktop » gvSIG data providers based on gdal

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright ? 2007-2016 gvSIG Association

 *

 * 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.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.gdal.prov.ogr;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import org.apache.commons.lang3.StringUtils;

import org.gdal.ogr.DataSource;

import org.gdal.ogr.Feature;

import org.gdal.ogr.FeatureDefn;

import org.gdal.ogr.FieldDefn;

import org.gdal.ogr.GeomFieldDefn;

import org.gdal.ogr.Geometry;

import org.gdal.ogr.Layer;

import org.gdal.ogr.ogr;

import org.gdal.ogr.ogrConstants;

import org.gvsig.fmap.dal.DataStore;

import org.gvsig.fmap.dal.DataStoreParameters;

import org.gvsig.fmap.dal.DataTypes;

import org.gvsig.fmap.dal.FileHelper;

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.ReadRuntimeException;

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

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

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

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

import org.gvsig.fmap.dal.feature.FeatureQueryOrder.FeatureQueryOrderMember;

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

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

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

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

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.feature.spi.FeatureStoreProvider;

import org.gvsig.fmap.dal.resource.ResourceAction;

import org.gvsig.fmap.dal.resource.file.FileResource;

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

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

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

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

import org.gvsig.fmap.geom.GeometryLocator;

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

import org.gvsig.fmap.geom.type.GeometryTypeNotSupportedException;

import org.gvsig.fmap.geom.type.GeometryTypeNotValidException;

import org.gvsig.tools.dynobject.DynObject;

import org.gvsig.tools.evaluator.Evaluator;

import org.gvsig.tools.exception.BaseException;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 *

 * @author <a href="mailto:lmarques@disid.com">Lluis Marques</a>

 *

 */

public class OGRDataStoreProvider extends AbstractFeatureStoreProvider implements

    FeatureStoreProvider, ResourceConsumer {

    private static final Logger LOG = LoggerFactory.getLogger(OGRDataStoreProvider.class);

    /**

     *

     */

    public static final String METADATA_DEFINITION_NAME = "OGRDataStoreProvider";

    /**

     *

     */

    public static final String NAME = "OGRDataStoreProvider";

    /**

     *

     */

    public static final String DESCRIPTION = "OGR provider to open vectorial resources";

    protected DataSource dataSource;

    private Envelope envelope;

    private Layer newLayer;

    protected ResourceProvider resourceProvider;

    private Boolean updateSupport;

    private boolean opened = false;

    protected OGRDataStoreProvider(DataStoreParameters dataParameters,

        DataStoreProviderServices storeServices, DynObject metadata) throws InitializeException {

        super(dataParameters, storeServices, metadata);

        // Set CRS parameter to metadata

        this.setDynValue(DataStore.METADATA_CRS, dataParameters.getDynValue(DataStore.METADATA_CRS));

        getResource().addConsumer(this);

        try {

            this.open();

        } catch (OpenException e) {

            throw new InitializeException(NAME, e);

        }

    }

    protected OGRDataStoreProvider(DataStoreParameters dataParameters,

        DataStoreProviderServices storeServices) throws InitializeException {

        this(dataParameters, storeServices, FileHelper

            .newMetadataContainer(METADATA_DEFINITION_NAME));

    }

    /*

     * Lazy initialization of data source

     */

    protected synchronized DataSource getDataSource() throws OGRUnsupportedFormatException {

        if (this.dataSource == null) {

            // Prioritize connection string over file

            if (StringUtils.isNotBlank(getOGRParameters().getConnectionString())) {

                // Trying to open in update mode

                this.dataSource = ogr.Open(getOGRParameters().getConnectionString(), 1);

                if (this.dataSource == null) {

                    this.dataSource = ogr.Open(getOGRParameters().getConnectionString());

                    updateSupport = false;

                } else {

                    updateSupport = true;

                }

            } else if (getOGRParameters().getFile() != null

                && getOGRParameters().getFile().exists()) {

                // Trying to open in update mode

                this.dataSource = ogr.Open(getOGRParameters().getFile().getAbsolutePath(), 1);

                if (this.dataSource == null) {

                    this.dataSource = ogr.Open(getOGRParameters().getFile().getAbsolutePath());

                    updateSupport = false;

                } else {

                    updateSupport = true;

                }

            } else {

                throw new IllegalStateException(

                    "Invalid parameters. Connection string must not be blank or file must exists");

            }

        }

        if (this.dataSource == null) {

            if (StringUtils.isNotBlank(getOGRParameters().getConnectionString())) {

                throw new OGRUnsupportedFormatException(getOGRParameters().getConnectionString());

            }

        }

        return this.dataSource;

    }

    /*

     * Lazy initialization of update support flag

     */

    private Boolean hasUpdateSupport() throws OGRUnsupportedFormatException {

        if (this.updateSupport == null) {

            getDataSource();

        }

        return this.updateSupport;

    }

    /*

     * Lazy initialization of layer

     */

    protected Layer getLayer() throws OGRUnsupportedFormatException {

        if (this.newLayer == null) {

            String layerName = getOGRParameters().getLayerName();

            if(StringUtils.isBlank(layerName)){

                this.newLayer = getDataSource().GetLayer(0);

                getOGRParameters().setLayerName(this.newLayer.GetName());

            } else {

                this.newLayer = getDataSource().GetLayer(layerName);

                if (this.newLayer == null) {

                    LOG.warn("Can not get layer with {} name. Get first layer of data source",

                        getOGRParameters().getLayerName());

                    this.newLayer = getDataSource().GetLayer(0);

                    getOGRParameters().setLayerName(this.newLayer.GetName());

                }

            }

        }

        return this.newLayer;

    }

    /*

     * Lazy envelope initialization

     */

    @Override

    public synchronized Envelope getEnvelope() throws DataException {

        open();

        if (this.envelope == null) {

            this.envelope = (Envelope) getResource().execute(new ResourceAction() {

                @Override

                public Object run() throws Exception {

                    Layer layer = getLayer();

                    double[] extent = layer.GetExtent(true);

                    if (extent != null) {

                        return GeometryLocator.getGeometryManager().createEnvelope(extent[0],

                            extent[2], extent[1], extent[3], SUBTYPES.GEOM2D);

                    } else {

                        Envelope tmpEnvelope =

                            GeometryLocator.getGeometryManager().createEnvelope(SUBTYPES.GEOM2D);

                        FeatureType featureType = getStoreServices().getDefaultFeatureType();

                        layer.ResetReading();

                        Feature feature = layer.GetNextFeature();

                        while (feature!=null) {

                            double[] envelope = new double[4];

                            int geomFieldIndex =

                                layer.GetLayerDefn().GetGeomFieldIndex(

                                    featureType.getDefaultGeometryAttributeName());

                            Geometry ogrGeometry = feature.GetGeomFieldRef(geomFieldIndex);

                            ogrGeometry.GetEnvelope(envelope);

                            tmpEnvelope.add(GeometryLocator.getGeometryManager()

                                .createEnvelope(envelope[0], envelope[2], envelope[1], envelope[3],

                                    SUBTYPES.GEOM2D));

                            feature = layer.GetNextFeature();

                        }

                        return tmpEnvelope;

                    }

                }

            });

        }

        return this.envelope;

    }

    @Override

    public String getFullName() {

        StringBuilder stb = new StringBuilder();

        stb.append(NAME);

        stb.append(":");

        if (StringUtils.isBlank(getOGRParameters().getConnectionString())) {

            stb.append(getOGRParameters().getFile().getAbsolutePath());

            stb.append(":");

            stb.append(getOGRParameters().getLayerName());

        } else {

            stb.append(getOGRParameters().getConnectionString());

        }

        return stb.toString();

    }

    @Override

    public String getName() {

        return getOGRParameters().getLayerName();

    }

    @Override

    public String getProviderName() {

        return NAME;

    }

    @Override

    public boolean allowWrite() {

        try {

            return getLayer().TestCapability(ogrConstants.OLCAlterFieldDefn)

                && getLayer().TestCapability(ogrConstants.OLCCreateField)

                && getLayer().TestCapability(ogrConstants.OLCDeleteField)

                && getLayer().TestCapability(ogrConstants.OLCDeleteFeature) && hasUpdateSupport();

        } catch (OGRUnsupportedFormatException e) {

            LOG.error("Can not determinate if data source allows write", e);

            return false;

        }

    }

    @Override

    public ResourceProvider getResource() {

        if (this.resourceProvider == null) {

            if (StringUtils.isBlank(getOGRParameters().getConnectionString())) {

                try {

                    this.resourceProvider =

                        this.createResource(FileResource.NAME, new Object[] { getOGRParameters()

                            .getFile().getAbsolutePath() });

                } catch (InitializeException e) {

                    throw new ReadRuntimeException(String.format(

                        "Can not create file resource with %1s path", getOGRParameters().getFile()

                            .getAbsolutePath()), e);

                }

            } else {

                try {

                    this.resourceProvider =

                        this.createResource(OGRResource.NAME, new Object[] { getOGRParameters()

                            .getConnectionString() });

                } catch (InitializeException e) {

                    throw new ReadRuntimeException(String.format(

                        "Can not create OGR resource with %1s", getOGRParameters()

                            .getConnectionString()), e);

                }

            }

        }

        return resourceProvider;

    }

    @Override

    public Object getSourceId() {

        return this.getOGRParameters().getFile();

    }

    @Override

    public void open() throws OpenException {

        if (opened == false) {

            try {

                this.opened = loadFeatureType();

            } catch (BaseException e) {

                LOG.error("Can not load feature type", e);

                throw new OpenException(getFullName(), e);

            }

        }

    }

    protected synchronized boolean loadFeatureType() throws OGRUnsupportedFormatException,

        GeometryTypeNotSupportedException, GeometryTypeNotValidException {

        return (boolean) getResource().execute(new ResourceAction() {

            @Override

            public Object run() throws Exception {

                FeatureDefn featureDefn = getLayer().GetLayerDefn();

                OGRConverter converter = new OGRConverter();

                String defaultGeometryField = getOGRParameters().getDefaultGeometryField();

                FeatureType featureType = converter.convert(featureDefn, defaultGeometryField);

                if (featureType.getDefaultSRS() != null) {

                    setDynValue(DataStore.METADATA_CRS, featureType.getDefaultSRS());

                }

                List<FeatureType> featureTypes = new ArrayList<FeatureType>();

                featureTypes.add(featureType);

                getStoreServices().setFeatureTypes(featureTypes, featureType);

                return true;

            }

        });

    }

    @SuppressWarnings("rawtypes")

    @Override

    public void performChanges(final Iterator deleteds, final Iterator inserteds,

        final Iterator updateds, final Iterator featureTypesChanged) throws DataException {

        getResource().execute(new ResourceAction() {

            @Override

            public Object run() throws Exception {

                OGRConverter converter = new OGRConverter();

                if (getLayer().TestCapability(ogrConstants.OLCTransactions)) {

                    getLayer().StartTransaction();

                }

                while (featureTypesChanged.hasNext()) {

                    FeatureTypeChanged featureTypeChange =

                        (FeatureTypeChanged) featureTypesChanged.next();

                    FeatureType source = featureTypeChange.getSource();

                    FeatureType target = featureTypeChange.getTarget();

                    for (int i = 0; i < source.getAttributeDescriptors().length; i++) {

                        EditableFeatureAttributeDescriptor eAttDescriptor =

                            source.getEditable().getEditableAttributeDescriptor(i);

                        if (eAttDescriptor.getOriginalName() != null) {

                            int index =

                                getLayer().GetLayerDefn().GetFieldIndex(

                                    eAttDescriptor.getOriginalName());

                            FieldDefn field = converter.convertField(eAttDescriptor);

                            getLayer().AlterFieldDefn(index, field, ogrConstants.ALTER_ALL_FLAG);

                        } else if (target.getAttributeDescriptor(eAttDescriptor.getName()) == null) {

                            int index = getLayer().FindFieldIndex(eAttDescriptor.getName(), 1);

                            getLayer().DeleteField(index);

                        }

                    }

                    List<FieldDefn> fields = converter.convertFields(target);

                    for (FieldDefn fieldDefn : fields) {

                        int index = getLayer().GetLayerDefn().GetFieldIndex(fieldDefn.GetName());

                        if (index == -1) {

                            getLayer().CreateField(fieldDefn);

                        } else {

                            getLayer()

                                .AlterFieldDefn(index, fieldDefn, ogrConstants.ALTER_ALL_FLAG);

                        }

                    }

                    if (getLayer().TestCapability(ogrConstants.OLCCreateGeomField)) {

                        List<GeomFieldDefn> geometryFields =

                            converter.convertGeometryFields(target, true);

                        for (GeomFieldDefn geomFieldDefn : geometryFields) {

                            int index =

                                getLayer().GetLayerDefn()

                                    .GetGeomFieldIndex(geomFieldDefn.GetName());

                            if (index == -1) {

                                getLayer().CreateGeomField(geomFieldDefn);

                            }

                        }

                    } else {

                        StringBuilder stb = new StringBuilder();

                        stb.append("Driver '");

                        stb.append(getDataSource().GetDriver().GetName());

                        stb.append("' does not support create geometry fields");

                        LOG.warn(stb.toString());

                    }

                }

                while (deleteds.hasNext()) {

                    FeatureReferenceProviderServices reference =

                        (FeatureReferenceProviderServices) deleteds.next();

                    getLayer().DeleteFeature((int) reference.getOID());

                }

                while (inserteds.hasNext()) {

                    FeatureProvider featureProvider = (FeatureProvider) inserteds.next();

                    getLayer().CreateFeature(converter.convert(featureProvider));

                }

                while (updateds.hasNext()) {

                    FeatureProvider featureProvider = (FeatureProvider) updateds.next();

                    Feature ogrFeature = converter.convert(featureProvider);

                    getLayer().SetFeature(ogrFeature);

                }

                if (getLayer().TestCapability(ogrConstants.OLCTransactions)) {

                    getLayer().CommitTransaction();

                }

                getDataSource().SyncToDisk();

                repack();

                getResource().notifyChanges();

                return null;

            }

        });

    }

    protected void repack() throws OGRUnsupportedFormatException {

        LOG.debug("Running SQL: REPACK ".concat(getLayer().GetName()));

        getDataSource().ExecuteSQL("REPACK ".concat(getLayer().GetName()));

    }

    @Override

    public Object createNewOID() {

        try {

            return getFeatureCount() + 1;

        } catch (DataException e) {

            LOG.error("Can't get feature count", e);

            throw new ReadRuntimeException(getFullName(), e);

        }

    }

    @Override

    public FeatureSetProvider createSet(FeatureQuery query, FeatureType featureType)

        throws DataException {

        open();

        return new OGRFetureSetProvider(this, query, featureType);

    }

    @Override

    public long getFeatureCount() throws DataException {

        open();

        return ((Number) getResource().execute(new ResourceAction() {

            @Override

            public Object run() throws Exception {

                int featureCount = getLayer().GetFeatureCount(0);

                if( featureCount == -1 ) {

                    featureCount = getLayer().GetFeatureCount();

                }

                return featureCount;

            }

        })).longValue();

    }

    @Override

    public int getOIDType() {

        return DataTypes.LONG;

    }

    @Override

    protected FeatureProvider internalGetFeatureProviderByReference(

        FeatureReferenceProviderServices providerServices, FeatureType featureType)

        throws DataException {

        int oid = (int)providerServices.getOID();

        // Parece que hay un bug en el proveedor de SQLite para gdal.

        // Cuando se lee la capa, el m?todo GetFID est? indexado empezando por 0,

        // pero cuando se busca una ogrFeature a partir de dicho FID

        // el m?todo GetFeature(fid) est? indexado empezando por 1.

        // Esto es para rodear el problema.

        if(this.dataSource.GetDriver().getName().equalsIgnoreCase("SQLite")){

            oid++;

        }

        Feature ogrFeature = getLayer().GetFeature(oid);

        int fid = ogrFeature.GetFID();

        FeatureProvider featureProvider =

            new DefaultFeatureProvider(featureType, fid);

        OGRConverter converter = new OGRConverter();

        featureProvider = converter.convert(featureProvider, featureType, ogrFeature);

        return featureProvider;

    }

    private OGRDataStoreParameters getOGRParameters() {

        return (OGRDataStoreParameters) this.getParameters();

    }

    @SuppressWarnings("rawtypes")

    protected String compoundSelect(FeatureType type, Evaluator evaluator,

        FeatureQueryOrder featureQueryOrder) {

        StringBuilder query = new StringBuilder();

        query.append("SELECT ");

        FeatureAttributeDescriptor[] attributeDescriptors = type.getAttributeDescriptors();

        for (int i = 0; i < attributeDescriptors.length; i++) {

            query.append("\"");

            query.append(attributeDescriptors[i].getName());

            query.append("\"");

            // Don't add the last comma

            if (i < attributeDescriptors.length - 1) {

                query.append(",");

            }

        }

        query.append(" FROM ");

        query.append("\"");

        query.append(getOGRParameters().getLayerName());

        query.append("\"");

        if (featureQueryOrder != null && featureQueryOrder.iterator().hasNext()) {

            query.append(" ORDER BY ");

            Iterator iterator = featureQueryOrder.iterator();

            while (iterator.hasNext()) {

                FeatureQueryOrderMember member = (FeatureQueryOrderMember) iterator.next();

                if (member.hasEvaluator()) {

                    // TODO

                } else {

                    query.append("\"");

                    query.append(member.getAttributeName());

                    query.append("\"");

                }

                if (member.getAscending()) {

                    query.append(" ASC");

                } else {

                    query.append(" DESC");

                }

                if (iterator.hasNext()) {

                    query.append(", ");

                } else {

                    query.append(' ');

                    break;

                }

            }

        }

        return query.toString();

    }

    @Override

    protected void doDispose() throws BaseException {

        super.doDispose();

        getResource().removeConsumer(this);

        this.resourceProvider = null;

        getDataSource().delete();

        this.envelope = null;

        this.newLayer = null;

        this.dataSource = null;

        this.opened = false;

        this.updateSupport = null;

    }

    @Override

    public boolean closeResourceRequested(ResourceProvider resource) {

        try {

            getDataSource().delete();

        } catch (OGRUnsupportedFormatException e) {

            LOG.warn(String.format("Can not close resource requested %1s", resource), e);

        }

        this.envelope = null;

        this.newLayer = null;

        this.dataSource = null;

        this.opened = false;

        this.updateSupport = null;

        return true;

    }

    @Override

    public void resourceChanged(ResourceProvider resource) {

        try {

            getDataSource().delete();

        } catch (OGRUnsupportedFormatException e) {

            LOG.warn(String.format("Can not close resource requested %1s", resource), e);

        }

        this.envelope = null;

        this.newLayer = null;

        this.dataSource = null;

        this.opened = false;

        this.updateSupport = null;

    }

}