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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) 2015-2016, 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.io.IOException;
import org.geotools.data.FeatureReader;
import org.geotools.data.Query;
import org.geotools.data.store.ContentEntry;
import org.geotools.data.store.ContentFeatureSource;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.opengis.feature.FeatureVisitor;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.Filter;
import org.opengis.referencing.crs.CoordinateReferenceSystem;

/**
 * Read access to feature content held in memory.
 *
 * @author Jody Garnett (Boundless)
 */
public class MemoryFeatureSource extends ContentFeatureSource {

    public MemoryFeatureSource(ContentEntry entry) {
        this(entry, Query.ALL);
    }

    public MemoryFeatureSource(ContentEntry entry, Query query) {
        super(entry, query);
    }

    /** Access parent MemoryDataStore. */
    public MemoryDataStore getDataStore() {
        return (MemoryDataStore) super.getDataStore();
    }

    public MemoryState getState() {
        return (MemoryState) super.getState();
    }
    /** The entry for the feature source. */
    public MemoryEntry getEntry() {
        return (MemoryEntry) super.getEntry();
    }

    @Override
    protected ReferencedEnvelope getBoundsInternal(Query query) throws IOException {
        if (query.getFilter() == Filter.INCLUDE) { // filtering not implemented
            FeatureReader featureReader =
                    getReaderInternal(query);
            CoordinateReferenceSystem crs =
                    featureReader.getFeatureType().getCoordinateReferenceSystem();
            ReferencedEnvelope bounds = ReferencedEnvelope.create(crs);
            try {
                while (featureReader.hasNext()) {
                    SimpleFeature feature = featureReader.next();
                    bounds.include(feature.getBounds());
                }
            } finally {
                featureReader.close();
            }
            return bounds;
        }
        return null; // feature by feature scan required to count records
    }

    @Override
    protected int getCountInternal(Query query) throws IOException {
        if (query.getFilter() == Filter.INCLUDE) {
            MemoryEntry entry = getEntry();
            return entry.getMemory().size();
        }
        // feature by feature count required
        return -1;
    }

    @Override
    protected FeatureReader getReaderInternal(Query query)
            throws IOException {
        return new MemoryFeatureReader(getState(), query);
    }

    @Override
    protected SimpleFeatureType buildFeatureType() {
        return getState()
                .getEntry()
                .schema; // cache schema unchanged (as we do not retype/reproject)
    }

    @Override
    protected boolean handleVisitor(Query query, FeatureVisitor visitor) throws IOException {
        return super.handleVisitor(query, visitor);
    }
}