/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2007-2008, 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.imageio.metadata;

/**
 * A {@code CoordinateSystem} node in the metadata tree.
 * <p>
 * A coordinate system (CS) is the non-repeating sequence of coordinate system
 * axes that spans a given coordinate space. A 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.
 * </p>
 * 
 * @author Daniele Romagnoli, GeoSolutions
 * @author Alessio Fabiani, GeoSolutions
 *
 *
 * @source $URL: http://svn.osgeo.org/geotools/trunk/modules/unsupported/coverage-experiment/coverage-core/src/main/java/org/geotools/imageio/metadata/CoordinateSystem.java $
 */
public class CoordinateSystem extends IdentifiableMetadataAccessor {

    /** Axes * */
    private final ChildList<Axis> axes;

    /**
     * Implicit constructor.
     * 
     * @param metadata
     * @param absoluteParentCRSPath
     */
    protected CoordinateSystem(SpatioTemporalMetadata metadata,
            String absoluteParentCRSPath) {
        super(metadata, new StringBuilder(absoluteParentCRSPath).append(SEPARATOR)
        		.append(SpatioTemporalMetadataFormat.MD_COORDINATESYSTEM).toString(),
                SpatioTemporalMetadataFormat.MD_CS_AXES);
        axes = new ChildList.Axes(metadata, absoluteParentCRSPath);
    }

    protected int childCount() {
        return axes.childCount();
    }

    public Axis getAxis(int index) {
        return axes.getChild(index);
    }

    public Axis addAxis() {
        return axes.addChild();
    }
}