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


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 a force applied uniformly over a surface.
16  * The system unit for this quantity is "kg/(m·s²)". By default, instances of
17  * this class are showed in Pascal ("Pa").
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 Pressure extends Quantity {
23
24     /**
25      * Holds the associated unit.
26      */
27     private final static Unit<Pressure> UNIT = SI.PASCAL;
28
29     /**
30      * Holds the factory for this class.
31      */
32     private final static Factory<Pressure> FACTORY = new Factory<Pressure>(UNIT) {
33         protected Pressure create() {
34             return new Pressure();
35         }
36     }.useFor(UNIT.getBaseUnits());
37
38     /**
39      * Represents a {@link Pressure} amounting to nothing.
40      */
41     public final static Pressure ZERO = Quantity.valueOf(0, UNIT);
42
43     /**
44      * Default constructor (allows for derivation).
45      */
46     protected Pressure() {
47     }
48
49     /**
50      * Shows {@link Pressure} instances in the specified unit.
51      *
52      * @param unit the display unit for {@link Pressure} instances.
53      */
54     public static void showAs(Unit unit) {
55         QuantityFormat.show(Pressure.class, unit);
56     }
57
58     private static final long serialVersionUID = 1L;
59
60 }
61
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