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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) 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.data;

import java.io.IOException;
import org.geotools.util.factory.Hints;
import org.opengis.filter.identity.GmlObjectId;

/**
 * Interface providing lookup operations for gml objects.
 *
 * This interface may be implemented by data stores to provide an additional operation for
 * looking object a "gml object" directly. A gml object is typically a feature or a geometry.
 *
 * @author Justin Deoliveira, The Open Planning Project, [email protected]
 * @since 2.5
 */
public interface GmlObjectStore {

    /**
     * Looks up an object by its gml id.
     *
     * This method returns null if no such object exists.
     *
     * @param id The id of the object, must not be null.
     * @param hints Any hints to use when looking up the gml object, this value may be null
     *     .
     * @return The gml object, or null if one could not be found matching the specified
     *     id.
     * @throws IOException Any I/O errors that occur.
     */
    Object getGmlObject(GmlObjectId id, Hints hints) throws IOException;
}