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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.EventObject;
import org.geotools.data.FeatureEvent;
import org.opengis.feature.Feature;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.type.FeatureType;

/**
 * A simple event object to represent all events triggered by FeatureCollection instances (typically
 * change events).
 */
public class CollectionEvent extends EventObject {
    private static final long serialVersionUID = -1864190177730929948L;

    /*
     * Design Notes:
     *  - Must look at other classes for hints on how to implement nicely.
     */

    /** event type constant denoting the adding of a feature */
    public static final int FEATURES_ADDED = 0;

    /** event type constant denoting the removal of a feature */
    public static final int FEATURES_REMOVED = 1;

    /** event type constant denoting that features in the collection has been modified */
    public static final int FEATURES_CHANGED = 2;

    /** Indicates one of FEATURES_ADDED, FEATURES_REMOVED, FEATURES_CHANGED */
    private int type;

    /** Holds value of property features. */
    private SimpleFeature[] features;

    public CollectionEvent(
            FeatureCollection collection,
            FeatureEvent event) {
        super(collection);

        switch (event.getType()) {
            case ADDED:
                this.type = CollectionEvent.FEATURES_ADDED;
                break;

            case CHANGED:
                this.type = CollectionEvent.FEATURES_CHANGED;
                break;

            case REMOVED:
                this.type = CollectionEvent.FEATURES_REMOVED;
                break;

            default:
                this.type = CollectionEvent.FEATURES_REMOVED;
        }
        this.features = null;
    }

    /**
     * Constructs a new CollectionEvent.
     *
     * @param source the collection which triggered the event
     */
    public CollectionEvent(
            FeatureCollection source,
            SimpleFeature[] involvedFeatures,
            int type) {
        super(source);
        this.type = type;
        this.features = involvedFeatures;
    }

    /**
     * provides access to the SimpleFeatureCollection which fired the event
     *
     * @return The SimpleFeatureCollection which was the event's source.
     */
    @SuppressWarnings("unchecked")
    public FeatureCollection getCollection() {
        return (FeatureCollection) source;
    }

    /**
     * Provides information on the type of change that has occured. Possible types are: add, remove,
     * change
     *
     * @return an int which must be one of FEATURES_ADDED, FEATURES_REMOVED, FEATURES_CHANGED
     */
    public int getEventType() {
        return type;
    }

    /**
     * Getter for property features.
     *
     * @return Value of property features.
     */
    public SimpleFeature[] getFeatures() {
        return this.features;
    }
}