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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) 2003-2008, 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.crs;

import java.util.Iterator;
import java.util.NoSuchElementException;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.feature.FeatureIterator;
import org.geotools.feature.FeatureTypes;
import org.geotools.feature.SchemaException;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.opengis.feature.IllegalAttributeException;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.referencing.crs.CoordinateReferenceSystem;

/**
 * ForceCoordinateSystemFeatureReader provides a CoordinateReferenceSystem for FeatureTypes.
 *
 * ForceCoordinateSystemFeatureReader is a wrapper used to force GeometryAttributes to a user
 * supplied CoordinateReferenceSystem rather then the default supplied by the DataStore.
 *
 * 
Example Use:
 *
 * 

 * ForceCoordinateSystemFeatureReader reader =
 *     new ForceCoordinateSystemFeatureReader( originalReader, forceCS );
 *
 * CoordinateReferenceSystem originalCS =
 *     originalReader.getFeatureType().getDefaultGeometry().getCoordianteSystem();
 *
 * CoordinateReferenceSystem newCS =
 *     reader.getFeatureType().getDefaultGeometry().getCoordinateSystem();
 *
 * assertEquals( forceCS, newCS );
 * 
 *
 * @author jgarnett, Refractions Research, Inc.
 * @author aaime
 * @author $Author: jive $ (last modification)
 * @version $Id$
 */
public class ForceCoordinateSystemIterator
        implements SimpleFeatureIterator, Iterator {
    protected FeatureIterator reader;
    protected SimpleFeatureBuilder builder;

    /** Shortcut constructor that can be used if the new schema has already been computed */
    ForceCoordinateSystemIterator(FeatureIterator reader, SimpleFeatureType schema) {
        this.reader = reader;
        this.builder = new SimpleFeatureBuilder(schema);
    }

    /** Builds a new ForceCoordinateSystemFeatureReader */
    public ForceCoordinateSystemIterator(
            FeatureIterator reader,
            SimpleFeatureType type,
            CoordinateReferenceSystem cs)
            throws SchemaException {
        if (cs == null) {
            throw new NullPointerException("CoordinateSystem required");
        }
        CoordinateReferenceSystem originalCs =
                type.getGeometryDescriptor().getCoordinateReferenceSystem();

        if (!cs.equals(originalCs)) {
            type = FeatureTypes.transform(type, cs);
        }
        builder = new SimpleFeatureBuilder(type);

        this.reader = reader;
    }

    /** @see org.geotools.data.FeatureReader#getFeatureType() */
    public SimpleFeatureType getFeatureType() {
        if (reader == null || builder == null) {
            throw new IllegalStateException("Reader has already been closed");
        }
        return builder.getFeatureType();
    }

    /** @see org.geotools.data.FeatureReader#next() */
    public SimpleFeature next() throws NoSuchElementException {
        if (reader == null) {
            throw new IllegalStateException("Reader has already been closed");
        }

        SimpleFeature next = reader.next();
        if (builder == null) return next;

        try {
            return SimpleFeatureBuilder.retype(next, builder);
        } catch (IllegalAttributeException eep) {
            throw (IllegalStateException)
                    new IllegalStateException(eep.getMessage()).initCause(eep);
        }
    }

    /** @see org.geotools.data.FeatureReader#hasNext() */
    public boolean hasNext() {
        if (reader == null) {
            throw new IllegalStateException("Reader has already been closed");
        }

        return reader.hasNext();
    }

    public void remove() {
        throw new UnsupportedOperationException();
    }
    /** @see org.geotools.data.FeatureReader#close() */
    public void close() {
        if (reader == null) {
            return;
        }
        reader.close();
        reader = null;
        builder = null;
    }
}