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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.data.memory;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.geotools.data.Transaction;
import org.geotools.feature.NameImpl;
import org.opengis.feature.type.Name;
import org.opengis.filter.Filter;
import org.opengis.filter.capability.FilterCapabilities;
import org.opengis.referencing.crs.CoordinateReferenceSystem;

/**
 * Used to quickly adapt a collection for APIs expecting to be able to query generic content.
 *
 * Please note that this is read-only access.
 *
 * @author Jody Garnett
 */
public final class CollectionSource {

    private Collection collection;
    private CoordinateReferenceSystem crs;

    public CollectionSource(Collection collection) {
        this(collection, null);
    }

    public CollectionSource(Collection collection, CoordinateReferenceSystem crs) {
        this.collection = Collections.unmodifiableCollection(collection);
        this.crs = crs;
    }

    public Collection content() {
        return collection;
    }

    public Collection content(String query, String queryLanguage) {
        throw new UnsupportedOperationException("Please help me hook up the parser!");
    }

    public Collection content(Filter filter) {
        return content(filter, Integer.MAX_VALUE);
    }

    public Collection content(Filter filter, int countLimit) {
        List list = new ArrayList();
        int count = 0;
        for (Iterator i = collection.iterator(); i.hasNext() && count < countLimit; ) {
            Object obj = i.next();
            if (filter.evaluate(obj)) {
                list.add(obj);
                count++;
            }
        }
        return Collections.unmodifiableList(list);
    }

    public Object describe() {
        return Object.class; // TODO: be more specific
    }

    public void dispose() {
        collection = null;
    }

    public FilterCapabilities getFilterCapabilities() {
        return null;
    }

    public Name getName() {
        return new NameImpl("localhost/memory");
    }

    public void setTransaction(Transaction t) {
        // ignored
    }

    public CoordinateReferenceSystem getCRS() {
        return crs;
    }
}