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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) 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.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import org.geotools.data.store.ContentEntry;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;

/**
 * Entry used to store features (of a single FeatureType).
 *
 * 
 *
 * 
Please be sure to synchronize on entry before access:
 *
 * 
 synchronize ( entry ){
 *     entry.memory.put( feature.getID(), feature );
 * }
 *
 * @author Jody Garnett (Boundless)
 */
public class MemoryEntry extends ContentEntry {

    /** Schema of managed content. */
    final SimpleFeatureType schema;

    /**
     * Memory storage for features (addressed by fid).
     *
     * Please be sure to synchronize on entry before access:
     *
     * 
 synchronize ( entry ){
     *     entry.memory.put( feature.getID(), feature );
     * }
     */
    private final Map memory;

    /** Entry to store content of the provided SimpleFeatureType. */
    MemoryEntry(MemoryDataStore store, SimpleFeatureType schema) {
        super(store, schema.getName());
        this.schema = schema;
        memory = Collections.synchronizedMap(new LinkedHashMap());
    }

    protected MemoryState createContentState(ContentEntry entry) {
        return new MemoryState((MemoryEntry) entry);
    }

    /**
     * Access the {@link #memory} field used to store feature content.
     *
     * @return the memory
     */
    public Map getMemory() {
        return memory;
    }

    public String toString() {
        return "MemoryEntry '" + getTypeName() + "': " + getMemory().size() + " features";
    }

    /**
     * Safely add feature to {@link #memory}.
     *
     * Feature is required to be non-null, and of the expected {@link #schema}.
     */
    void addFeature(SimpleFeature feature) {
        if (feature == null) {
            throw new IllegalArgumentException("Provided Feature is empty");
        } else if (!feature.getFeatureType().equals(schema)) {
            throw new IllegalArgumentException(
                    "addFeatures expected "
                            + schema.getTypeName()
                            + "(but was "
                            + feature.getFeatureType().getTypeName()
                            + ")");
        }
        getMemory().put(feature.getID(), feature);
    }
}