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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.collection;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.geotools.data.DataUtilities;
import org.geotools.data.FeatureReader;
import org.geotools.data.collection.DelegateFeatureReader;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.feature.FeatureCollection;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.Filter;
import org.opengis.filter.sort.SortBy;

/**
 * SimpleFeatureCollection wrapper which limits the number of features returned.
 *
 * @author Justin Deoliveira, The Open Planning Project
 */
public class MaxSimpleFeatureCollection extends DecoratingSimpleFeatureCollection {

    SimpleFeatureCollection delegate;
    long start;
    long max;

    public MaxSimpleFeatureCollection(
            FeatureCollection delegate, long max) {
        this(DataUtilities.simple(delegate), 0, max);
    }

    public MaxSimpleFeatureCollection(SimpleFeatureCollection delegate, long max) {
        this(delegate, 0, max);
    }

    public MaxSimpleFeatureCollection(SimpleFeatureCollection delegate, long start, long max) {
        super(delegate);
        this.delegate = delegate;
        this.start = start;
        this.max = max;
    }

    FeatureReader reader() throws IOException {
        return new DelegateFeatureReader(getSchema(), features());
    }

    public SimpleFeatureIterator features() {
        return new MaxFeaturesSimpleFeatureIterator(delegate.features(), start, max);
    }

    public SimpleFeatureCollection subCollection(Filter filter) {
        throw new UnsupportedOperationException();
    }

    public SimpleFeatureCollection sort(SortBy order) {
        throw new UnsupportedOperationException();
    }

    public int size() {
        int size = delegate.size();
        if (size < start) {
            return 0;
        } else {
            return (int) Math.min(size - start, max);
        }
    }

    public boolean isEmpty() {
        return delegate.isEmpty() || max == 0 || delegate.size() - start < 1;
    }

    public Object[] toArray() {
        return toArray(new Object[size()]);
    }

    @SuppressWarnings("unchecked")
    public  T[] toArray(T[] a) {
        List list = new ArrayList();
        SimpleFeatureIterator i = features();
        try {
            while (i.hasNext()) {
                list.add((T) i.next());
            }
            return list.toArray(a);
        } finally {
            i.close();
        }
    }

    public boolean containsAll(Collection c) {
        for (Iterator i = c.iterator(); i.hasNext(); ) {
            if (!contains(i.next())) {
                return false;
            }
        }

        return true;
    }

    public ReferencedEnvelope getBounds() {
        // calculate manually
        return DataUtilities.bounds(this);
    }
}