Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 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 3

 * 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.fmap.dal.store.simplereader;

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

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

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

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

import org.gvsig.fmap.geom.Geometry;

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

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

public abstract class AbstractFeatureProviderLoadedOnDemand extends DefaultFeatureProvider {

    private static final Logger LOGGER = LoggerFactory.getLogger(AbstractFeatureProviderLoadedOnDemand.class);

    protected boolean loading;

    protected boolean loaded;

    protected String geomName;

    public AbstractFeatureProviderLoadedOnDemand(FeatureType type) {

        super(type);

        loading = false;

        loaded = false;

        FeatureAttributeDescriptor geomdesc = type.getDefaultGeometryAttribute();

        if( geomdesc!=null ) {

            geomName = geomdesc.getName();

        }

    }

    protected void load() {

        if (loading || loaded || this.isNew()) {

            return;

        }

        loading = true;

        try {

            doLoad();

        } catch (Exception e) {

            this.warn("Can't load feature", e);

        } finally {

            loading = false;

            loaded = true;

        }

    }

    protected abstract void doLoad();

    @Override

    public void set(int i, Object value) {

        this.load();

        super.set(i, value);

    }

    @Override

    public void set(String name, Object value) {

        this.load();

        super.set(featureType.getIndex(name), value);

    }

    @Override

    public Object get(int i) {

        this.load();

        return super.get(i);

    }

    @Override

    public Object get(String name) {

        this.load();

        return super.get(name);

    }

    @Override

    public Geometry getDefaultGeometry() {

        if( geomName == null ) {

            return null;

        }

        return (Geometry) this.get(geomName);

    }

    @Override

    public Envelope getDefaultEnvelope() {

        Geometry geom = this.getDefaultGeometry();

        if( geom==null ) {

            return null;

        }

        try {

            return geom.getEnvelope();

        } catch(Exception ex) {

            // En ocasiones con geometrias incorrectas getEnvelop falla.

            return null;

        }

    }

    @Override

    public void setOID(Object oid) {

        this.loaded = false;

        super.setOID(oid);

    }

    @Override

    public FeatureProvider getCopy() {

        this.load();

        return super.getCopy();

    }

    protected void warn(String message, Throwable t) {

    }

}