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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 org.opengis.feature.simple.SimpleFeatureType;

/**
 * A Default FIDReader. Just auto-increments an index. May be sufficient for files, representing
 * rows in a file. For jdbc datasources a ResultSetFIDReader should be used.
 *
 * @author Chris Holmes
 * @version $Id$
 */
public class DefaultFIDReader implements FIDReader {
    protected static final String CLOSE_MESG =
            "Close has already been called" + " on this FIDReader";

    private int len;
    protected int index = 0;
    protected StringBuffer buffer;

    public DefaultFIDReader(String typeName) {
        buffer = new StringBuffer(typeName);
        buffer.append('.');
        len = typeName.length() + 1;
    }

    public DefaultFIDReader(SimpleFeatureType featureType) {
        this(featureType.getTypeName());
    }

    /** Release any resources associated with this reader */
    public void close() {
        index = -1;
    }

    /**
     * Does another set of attributes exist in this reader?
     *
     * @return true if more attributes exist
     * @throws IOException If closed
     */
    public boolean hasNext() throws IOException {
        if (index < 0) {
            throw new IOException(CLOSE_MESG);
        }

        return index < Integer.MAX_VALUE;
    }

    /**
     * Read the attribute at the given index.
     *
     * @return Attribute at index
     * @throws IOException If closed
     */
    public String next() throws IOException {
        if (index < 0) {
            throw new IOException(CLOSE_MESG);
        }

        buffer.setLength(len);
        buffer.append(++index);

        return buffer.toString();
    }
}