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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) 2002-2015, 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.renderer.crs;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.util.LazySet;
import org.geotools.util.factory.FactoryCreator;
import org.geotools.util.factory.FactoryRegistry;
import org.geotools.util.factory.GeoTools;
import org.geotools.util.factory.Hints;
import org.geotools.util.logging.Logging;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;

/**
 * Looks up the {@link ProjectionHandler} for the specified rendering area. WARNING: this API is not
 * finalized and is meant to be used by StreamingRenderer only
 *
 * @author Andrea Aime - OpenGeo
 */
public class ProjectionHandlerFinder {

    private static FactoryRegistry registry;

    static final Logger LOGGER = Logging.getLogger(ProjectionHandlerFinder.class);

    public static final String WRAP_LIMIT_KEY = "org.geotools.render.wrapLimit";

    static int WRAP_LIMIT;

    static {
        if (registry == null) {
            registry =
                    new FactoryCreator(
                            Arrays.asList(new Class[] {ProjectionHandlerFactory.class}));
        }

        String wrapLimit = System.getProperty(WRAP_LIMIT_KEY);
        int limit = 10;
        try {
            if (wrapLimit != null) {
                limit = Integer.valueOf(wrapLimit);
            }
        } catch (NumberFormatException e) {
            LOGGER.log(
                    Level.SEVERE,
                    WRAP_LIMIT_KEY
                            + " has invalid value, it should be an integer number but it was: "
                            + wrapLimit);
        }
        WRAP_LIMIT = limit;
    }

    /**
     * Programmatically sets the number of wraps per direction the wrapping projection handlers will
     * apply
     */
    public static void setWrapLimit(int wrapLimit) {
        ProjectionHandlerFinder.WRAP_LIMIT = wrapLimit;
    }

    private static LazySet getProjectionHandlerFactories() {
        Hints hints = GeoTools.getDefaultHints();
        return new LazySet(
                registry.getFactories(ProjectionHandlerFactory.class, null, hints));
    }

    /**
     * Returns a projection handler for the specified rendering area, or null if not found
     *
     * @param renderingArea The area to be painted (mind, the CRS must be property set for
     *     projection handling to work)
     * @param wrap Enable continuous map wrapping if it's possible for the current projection
     */
    public static ProjectionHandler getHandler(
            ReferencedEnvelope renderingArea, CoordinateReferenceSystem sourceCrs, boolean wrap)
            throws FactoryException {
        return getHandler(renderingArea, sourceCrs, wrap, new HashMap());
    }

    /**
     * Returns a projection handler for the specified rendering area, or null if not found
     *
     * @param renderingArea The area to be painted (mind, the CRS must be property set for
     *     projection handling to work)
     * @param wrap Enable continuous map wrapping if it's possible for the current projection
     * @param projectionParameters map of options for the projection handler, allows finer
     *     configuration of the handler from the final user of it
     */
    public static ProjectionHandler getHandler(
            ReferencedEnvelope renderingArea,
            CoordinateReferenceSystem sourceCrs,
            boolean wrap,
            Map projectionParameters)
            throws FactoryException {
        if (renderingArea.getCoordinateReferenceSystem() == null) return null;

        for (ProjectionHandlerFactory factory : getProjectionHandlerFactories()) {
            ProjectionHandler handler =
                    factory.getHandler(renderingArea, sourceCrs, wrap, WRAP_LIMIT);
            if (handler != null) {
                handler.setProjectionParameters(projectionParameters);
                return handler;
            }
        }

        return null;
    }
}