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Java > Open Source Codes > org > jscience > physics > quantities > SolidAngle


1 /*
2  * JScience - Java(TM) Tools and Libraries for the Advancement of Sciences.
3  * Copyright (C) 2005 - JScience (http://jscience.org/)
4  * All rights reserved.
5  *
6  * Permission to use, copy, modify, and distribute this software is
7  * freely granted, provided that this notice is preserved.
8  */
9 package org.jscience.physics.quantities;
10
11 import org.jscience.physics.units.SI;
12 import org.jscience.physics.units.Unit;
13
14 /**
15  * This class represents the angle formed by three or more planes intersecting
16  * at a common point. The system unit for this quantity is "sr".
17  * This quantity is dimensionless.
18  *
19  * @author <a HREF="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a>
20  * @version 1.0, October 24, 2004
21  */
22 public class SolidAngle extends Dimensionless {
23
24     /**
25      * Holds the associated unit.
26      */
27     private final static Unit<SolidAngle> UNIT = SI.STERADIAN;
28
29     /**
30      * Holds the factory for this class.
31      */
32     private final static Factory<SolidAngle> FACTORY = new Factory<SolidAngle>(
33             UNIT) {
34         protected SolidAngle create() {
35             return new SolidAngle();
36         }
37     };
38
39     /**
40      * Represents a {@link SolidAngle} amounting to nothing.
41      */
42     public final static SolidAngle ZERO = Quantity.valueOf(0, UNIT);
43
44     /**
45      * Default constructor (allows for derivation).
46      */
47     protected SolidAngle() {
48     }
49
50     /**
51      * Shows {@link SolidAngle} instances in the specified unit.
52      *
53      * @param unit the display unit for {@link SolidAngle} instances.
54      */
55     public static void showAs(Unit unit) {
56         QuantityFormat.show(SolidAngle.class, unit);
57     }
58
59     private static final long serialVersionUID = 1L;
60
61 }
62
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