Android Open Source - android-openmap-framework Length

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License

The source code is released under:

Apache License

Java Source Code

// **********************************************************************
///*from  ww w . j  a  v a 2  s  .c  o m*/
// <copyright>
//
//  BBN Technologies
//  10 Moulton Street
//  Cambridge, MA 02138
//  (617) 873-8000
//
//  Copyright (C) BBNT Solutions LLC. All rights reserved.
//
// </copyright>
// **********************************************************************

package com.jwetherell.openmap.common;

public class Length {

    /** Miles, in WGS 84 spherical earth model units. */
    public final static Length MILE = new Length("mile", "miles", Planet.wgs84_earthEquatorialCircumferenceMiles_D);
    /** Feet, in WGS 84 spherical earth model units. */
    public final static Length FEET = new Length("feet", "feet", Planet.wgs84_earthEquatorialCircumferenceMiles_D * 5280.0);
    /** Meters, in WGS 84 Spherical earth model units. */
    public final static Length METER = new Length("meter", "m", Planet.wgs84_earthEquatorialCircumferenceMeters_D);
    /** Kilometers, in WGS 84 Spherical earth model units. */
    public final static Length KM = new Length("kilometer", "km", Planet.wgs84_earthEquatorialCircumferenceKM_D);
    /** Nautical Miles, in WGS 84 Spherical earth model units. */
    public final static Length NM = new Length("nautical mile", "nm", Planet.wgs84_earthEquatorialCircumferenceNMiles_D);
    /** Decimal Degrees, in WGS 84 Spherical earth model units. */
    public final static Length DECIMAL_DEGREE = new Length("decimal degree", "deg", 360.0);
    /** Data Mile, in WGS 84 spherical earth model units. */
    public final static Length DM = new Length("datamile", "dm", Planet.wgs84_earthEquatorialCircumferenceMiles_D * 5280.0 / 6000.0);

    /** Radians, in terms of a spherical earth. */
    public final static Length RADIAN = new Length("radian", "rad", MoreMath.TWO_PI_D) {

        public float toRadians(float numUnits) {
            return numUnits;
        }

        public double toRadians(double numUnits) {
            return numUnits;
        }

        public float fromRadians(float numRadians) {
            return numRadians;
        }

        public double fromRadians(double numRadians) {
            return numRadians;
        }
    };

    /** Unit/radians */
    protected final double constant;
    protected final String name;
    protected final String abbr;
    protected double unitEquatorCircumference;

    /**
     * Create a Length, with a name an the number of it's units that go around
     * the earth at its equator. The name and abbreviation are converted to
     * lower case for consistency.
     */
    public Length(String name, String abbr, double unitEquatorCircumference) {
        this.name = name.toLowerCase();
        this.unitEquatorCircumference = unitEquatorCircumference;
        this.constant = unitEquatorCircumference / MoreMath.TWO_PI_D;
        this.abbr = abbr.toLowerCase().intern();
    }

    /**
     * Given a number of units provided by this Length, convert to a number of
     * radians.
     */
    public float toRadians(float numUnits) {
        return numUnits / (float) constant;
    }

    public double toRadians(double numUnits) {
        return numUnits / constant;
    }

    /**
     * Given a number of radians, convert to the number of units represented by
     * this length.
     */
    public float fromRadians(float numRadians) {
        return numRadians * (float) constant;
    }

    /**
     * Given a number of radians, convert to the number of units represented by
     * this length.
     */
    public double fromRadians(double numRadians) {
        return numRadians * constant;
    }

    /**
     * Return the name for this length type.
     */
    public String toString() {
        return name;
    }

    /**
     * Return the abbreviation for this length type.
     */
    public String getAbbr() {
        return abbr;
    }

    /**
     * Get a list of the Lengths currently defined as static implementations of
     * this class.
     */
    public static Length[] getAvailable() {
        return new Length[] { METER, KM, FEET, MILE, DM, NM, DECIMAL_DEGREE };
    }

    /**
     * Get the Length object with the given name or abbreviation. If nothing
     * exists with that name, then return null. The lower case version of the
     * name or abbreviation is checked against the available options.
     */
    public static Length get(String name) {
        Length[] choices = getAvailable();

        for (int i = 0; i < choices.length; i++) {
            if (name.toLowerCase().intern() == choices[i].toString() || name.toLowerCase().intern() == choices[i].getAbbr()) {
                return choices[i];
            }
        }
        return null;
    }
}

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