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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;

import java.io.IOException;
import java.util.NoSuchElementException;
import org.geotools.feature.SchemaException;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
import org.opengis.feature.IllegalAttributeException;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;

/**
 * Basic support for reading Features from an AttributeReader.
 *
 * @author Ian Schneider
 * @version $Id$
 */
public class DefaultFeatureReader implements FeatureReader {
    private final AttributeReader attributeReader;
    private final SimpleFeatureType schema;
    protected final Object[] attributes;

    /**
     * Creates a new instance of AbstractFeatureReader
     *
     * @param attributeReader AttributeReader for contents
     * @param schema FeatureType to use, null if not provided
     * @throws SchemaException If Schema could not be obtained
     */
    public DefaultFeatureReader(AttributeReader attributeReader, SimpleFeatureType schema)
            throws SchemaException {
        this.attributeReader = attributeReader;

        if (schema == null) {
            schema = createSchema();
        }

        this.schema = schema;
        this.attributes = new Object[attributeReader.getAttributeCount()];
    }

    public DefaultFeatureReader(AttributeReader attributeReader) throws SchemaException {
        this(attributeReader, null);
    }

    public SimpleFeature next()
            throws IOException, IllegalAttributeException, NoSuchElementException {
        SimpleFeature f = null;

        if (attributeReader.hasNext()) {
            attributeReader.next();
            f = readFeature(attributeReader);
        }

        return f;
    }

    protected SimpleFeatureType createSchema() throws SchemaException {

        SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder();
        for (int i = 0, ii = attributeReader.getAttributeCount(); i < ii; i++) {
            builder.add(attributeReader.getAttributeType(i));
        }

        return builder.buildFeatureType();
    }

    protected SimpleFeature readFeature(AttributeReader atts)
            throws IllegalAttributeException, IOException {
        for (int i = 0, ii = atts.getAttributeCount(); i < ii; i++) {
            attributes[i] = atts.read(i);
        }

        return SimpleFeatureBuilder.build(schema, attributes, null);
    }

    public void close() throws IOException {
        attributeReader.close();
    }

    public SimpleFeatureType getFeatureType() {
        return schema;
    }

    public boolean hasNext() throws IOException {
        return attributeReader.hasNext();
    }
}