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Implementations of Coordinate Reference Systems (CRS), conversion and transformation services derived from ISO 19111.
There is a newer version: 3.20-geoapi-3.0
/*
 *    Geotoolkit.org - An Open Source Java GIS Toolkit
 *    http://www.geotoolkit.org
 *
 *    (C) 2004-2011, Open Source Geospatial Foundation (OSGeo)
 *    (C) 2009-2011, Geomatys
 *
 *    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.
 *
 *    This package contains documentation from OpenGIS specifications.
 *    OpenGIS consortium's work is fully acknowledged here.
 */
package org.geotoolkit.referencing.cs;

import java.util.Map;
import net.jcip.annotations.Immutable;

import org.opengis.referencing.cs.LinearCS;
import org.opengis.referencing.cs.CoordinateSystemAxis;
import org.opengis.geometry.MismatchedDimensionException;

import org.geotoolkit.measure.Measure;


/**
 * A one-dimensional coordinate system that consists of the points that lie on the single axis
 * described. The associated ordinate is the distance from the specified origin to the point
 * along the axis. Example: usage of the line feature representing a road to describe points
 * on or along that road. A {@code LinearCS} shall have one
 * {@linkplain #getAxis axis}.
 *
 * 
 * 
 * Used with CRS type(s)

 *   {@link org.geotoolkit.referencing.crs.DefaultEngineeringCRS Engineering}
 * 
 *
 * @author Martin Desruisseaux (IRD, Geomatys)
 * @version 3.19
 *
 * @since 2.0
 * @module
 */
@Immutable
public class DefaultLinearCS extends AbstractCS implements LinearCS {
    /**
     * Serial number for inter-operability with different versions.
     */
    private static final long serialVersionUID = -6890723478287625763L;

    /**
     * Constructs a new object in which every attributes are set to a default value.
     * This is not a valid object. This constructor is strictly
     * reserved to JAXB, which will assign values to the fields using reflexion.
     */
    private DefaultLinearCS() {
        this(org.geotoolkit.internal.referencing.NilReferencingObject.INSTANCE);
    }

    /**
     * Constructs a new coordinate system with the same values than the specified one.
     * This copy constructor provides a way to convert an arbitrary implementation into a
     * Geotk one or a user-defined one (as a subclass), usually in order to leverage
     * some implementation-specific API. This constructor performs a shallow copy,
     * i.e. the properties are not cloned.
     *
     * @param cs The coordinate system to copy.
     *
     * @since 2.2
     */
    public DefaultLinearCS(final LinearCS cs) {
        super(cs);
    }

    /**
     * Constructs a coordinate system from a name.
     *
     * @param name  The coordinate system name.
     * @param axis  The axis.
     */
    public DefaultLinearCS(final String name, final CoordinateSystemAxis axis) {
        super(name, axis);
    }

    /**
     * Constructs a coordinate system from a set of properties.
     * The properties map is given unchanged to the
     * {@linkplain AbstractCS#AbstractCS(Map,CoordinateSystemAxis[]) super-class constructor}.
     *
     * @param properties Set of properties. Should contains at least {@code "name"}.
     * @param axis       The axis.
     */
    public DefaultLinearCS(final Map properties, final CoordinateSystemAxis axis) {
        super(properties, axis);
    }

    /**
     * Returns a Geotk coordinate system implementation with the same values than the given arbitrary
     * implementation. If the given object is {@code null}, then this method returns {@code null}.
     * Otherwise if the given object is already a Geotk implementation, then the given object is
     * returned unchanged. Otherwise a new Geotk implementation is created and initialized to the
     * attribute values of the given object.
     *
     * @param  object The object to get as a Geotk implementation, or {@code null} if none.
     * @return A Geotk implementation containing the values of the given object (may be the
     *         given object itself), or {@code null} if the argument was null.
     *
     * @since 3.18
     */
    public static DefaultLinearCS castOrCopy(final LinearCS object) {
        return (object == null) || (object instanceof DefaultLinearCS)
                ? (DefaultLinearCS) object : new DefaultLinearCS(object);
    }

    /**
     * @deprecated Renamed {@link #castOrCopy castOrCopy}.
     * @param object The object to get as a Geotk implementation, or {@code null} if none.
     * @return The given object as a Geotk implementation.
     */
    @Deprecated
    public static DefaultLinearCS wrap(final LinearCS object) {
        return castOrCopy(object);
    }

    /**
     * Computes the distance between two points.
     *
     * @param  coord1 Coordinates of the first point.
     * @param  coord2 Coordinates of the second point.
     * @return The distance between {@code coord1} and {@code coord2}.
     * @throws MismatchedDimensionException if a coordinate doesn't have the expected dimension.
     */
    @Override
    public Measure distance(final double[] coord1, final double[] coord2)
            throws MismatchedDimensionException
    {
        ensureDimensionMatch("coord1", coord1);
        ensureDimensionMatch("coord2", coord2);
        return new Measure(Math.abs(coord1[0] - coord2[0]), getDistanceUnit());
    }
}