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The main module contains the GeoTools public interfaces that are used by other GeoTools modules (and GeoTools applications). Where possible we make use industry standard terms as provided by OGC and ISO standards. The formal GeoTools public api consists of gt-metadata, jts and the gt-main module. The main module contains the default implementations that are available provided to other GeoTools modules using our factory system. Factories are obtained from an appropriate FactoryFinder, giving applications a chance configure the factory used using the Factory Hints facilities. FilterFactory ff = CommonFactoryFinder.getFilterFactory(); Expression expr = ff.add( expression1, expression2 ); If you find yourself using implementation specific classes chances are you doing it wrong: Expression expr = new AddImpl( expression1, expressiom2 );

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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 */
package org.geotools.feature;

import java.util.Collection;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.feature.simple.SimpleFeatureImpl;
import org.opengis.feature.Association;
import org.opengis.feature.Attribute;
import org.opengis.feature.ComplexAttribute;
import org.opengis.feature.Feature;
import org.opengis.feature.FeatureFactory;
import org.opengis.feature.GeometryAttribute;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.AssociationDescriptor;
import org.opengis.feature.type.AttributeDescriptor;
import org.opengis.feature.type.ComplexType;
import org.opengis.feature.type.FeatureType;
import org.opengis.feature.type.GeometryDescriptor;
import org.opengis.filter.FilterFactory2;
import org.opengis.geometry.coordinate.GeometryFactory;
import org.opengis.referencing.crs.CRSFactory;
import org.opengis.referencing.crs.CoordinateReferenceSystem;

/**
 * Factory for creating instances of the Attribute family of classes.
 *
 * @author Ian Schneider
 * @author Gabriel Roldan
 * @author Justin Deoliveira
 * @version $Id$
 */
public abstract class AbstractFeatureFactoryImpl implements FeatureFactory {

    /** Factory used to create CRS objects */
    CRSFactory crsFactory;
    /** Factory used to create geomtries */
    GeometryFactory geometryFactory;

    public FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(null);

    /**
     * Whether the features to be built should be self validating on construction and value setting,
     * or not. But default, not, subclasses do override this value
     */
    boolean validating = false;

    public CRSFactory getCRSFactory() {
        return crsFactory;
    }

    public void setCRSFactory(CRSFactory crsFactory) {
        this.crsFactory = crsFactory;
    }

    public GeometryFactory getGeometryFactory() {
        return geometryFactory;
    }

    public void setGeometryFactory(GeometryFactory geometryFactory) {
        this.geometryFactory = geometryFactory;
    }

    public Association createAssociation(Attribute related, AssociationDescriptor descriptor) {
        return new AssociationImpl(related, descriptor);
    }

    public Attribute createAttribute(Object value, AttributeDescriptor descriptor, String id) {
        return new AttributeImpl(value, descriptor, id == null ? null : ff.gmlObjectId(id));
    }

    public GeometryAttribute createGeometryAttribute(
            Object value, GeometryDescriptor descriptor, String id, CoordinateReferenceSystem crs) {

        return new GeometryAttributeImpl(value, descriptor, id == null ? null : ff.gmlObjectId(id));
    }

    public ComplexAttribute createComplexAttribute(
            Collection value, AttributeDescriptor descriptor, String id) {
        return new ComplexAttributeImpl(value, descriptor, id == null ? null : ff.gmlObjectId(id));
    }

    public ComplexAttribute createComplexAttribute(Collection value, ComplexType type, String id) {
        return new ComplexAttributeImpl(value, type, id == null ? null : ff.gmlObjectId(id));
    }

    public Feature createFeature(Collection value, AttributeDescriptor descriptor, String id) {
        return new FeatureImpl(value, descriptor, ff.featureId(id));
    }

    public Feature createFeature(Collection value, FeatureType type, String id) {
        return new FeatureImpl(value, type, ff.featureId(id));
    }

    public SimpleFeature createSimpleFeature(Object[] array, SimpleFeatureType type, String id) {
        if (type.isAbstract()) {
            throw new IllegalArgumentException(
                    "Cannot create an feature of an abstract FeatureType " + type.getTypeName());
        }
        return new SimpleFeatureImpl(array, type, ff.featureId(id), validating);
    }

    public SimpleFeature createSimpleFeautre(
            Object[] array, AttributeDescriptor descriptor, String id) {
        return createSimpleFeature(array, (SimpleFeatureType) descriptor, id);
    }
}