/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2011, Open Source Geospatial Foundation (OSGeo)
 *    (C) 2003-2005, Open Geospatial Consortium Inc.
 *    
 *    All Rights Reserved. http://www.opengis.org/legal/
 */
package org.opengis.referencing.cs;

import org.opengis.referencing.IdentifiedObject;
import org.opengis.annotation.UML;

import static org.opengis.annotation.Obligation.*;
import static org.opengis.annotation.Specification.*;


/**
 * The set of coordinate system axes that spans a given coordinate space. A coordinate system (CS)
 * is derived from a set of (mathematical) rules for specifying how coordinates in a given space
 * are to be assigned to points. The coordinate values in a coordinate tuple shall be recorded in
 * the order in which the coordinate system axes associations are recorded, whenever those
 * coordinates use a coordinate reference system that uses this coordinate system.
 *
 *
 * @source $URL: http://svn.osgeo.org/geotools/trunk/modules/library/opengis/src/main/java/org/opengis/referencing/cs/CoordinateSystem.java $
 * @version <A HREF="http://portal.opengeospatial.org/files/?artifact_id=6716">Abstract specification 2.0</A>
 * @author  Martin Desruisseaux (IRD)
 * @since   GeoAPI 1.0
 *
 * @see org.opengis.referencing.cs.CoordinateSystemAxis
 * @see javax.measure.unit.Unit
 * @see org.opengis.referencing.datum.Datum
 * @see org.opengis.referencing.crs.CoordinateReferenceSystem
 */
@UML(identifier="CS_CoordinateSystem", specification=ISO_19111)
public interface CoordinateSystem extends IdentifiedObject {
    /**
     * Returns the dimension of the coordinate system.
     *
     * @return The dimension of the coordinate system.
     */
    int getDimension();

    /**
     * Returns the axis for this coordinate system at the specified dimension.
     * Each coordinate system must have at least one axis.
     *
     * @param  dimension The zero based index of axis.
     * @return The axis at the specified dimension.
     * @throws IndexOutOfBoundsException if {@code dimension} is out of bounds.
     */
    @UML(identifier="usesAxis", obligation=MANDATORY, specification=ISO_19111)
    CoordinateSystemAxis getAxis(int dimension) throws IndexOutOfBoundsException;
}