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1
4 package gnu.math;
5 import java.io.*;
6
7
10
11 public class DQuantity extends Quantity implements Externalizable
12 {
13 double factor;
14 Unit unt;
15 public final Unit unit() { return unt; }
16 public final Complex number() { return new DFloNum(factor); }
17
18 public final RealNum re() { return new DFloNum (factor); }
19 public final double doubleValue() { return factor * unt.factor; }
20
21 public DQuantity (double factor, Unit unit)
22 {
23 this.factor = factor;
24 this.unt = unit;
25 }
26
27 public boolean isExact () { return false; }
28
29 public boolean isZero () { return factor == 0.0; }
30
31 public static DQuantity add (DQuantity x, DQuantity y, double k)
32 {
33 if (x.dimensions() != y.dimensions())
34 throw new ArithmeticException  ("units mis-match");
35 double unit_ratio = y.unit().factor / x.unit().factor;
36 return new DQuantity (x.factor + k * unit_ratio * y.factor, x.unit());
37 }
38
39 public static DQuantity times (DQuantity x, DQuantity y)
40 {
41 double factor = x.factor * y.factor;
42 Unit unit = Unit.times(x.unit(), y.unit());
43 return new DQuantity (factor, unit);
44 }
45
46 public static DQuantity divide (DQuantity x, DQuantity y)
47 {
48 double factor = x.factor / y.factor;
49 Unit unit = Unit.divide(x.unit(), y.unit());
50 return new DQuantity (factor, unit);
51 }
52
53 public Numeric add (Object y, int k)
54 {
55 if (y instanceof DQuantity)
56 return add (this, (DQuantity) y, (double) k);
57 if (dimensions() == Dimensions.Empty && y instanceof RealNum)
58 return new DQuantity (factor + k * ((RealNum)y).doubleValue (), unit());
59 if (!(y instanceof Numeric))
60 throw new IllegalArgumentException ();
61 return ((Numeric)y).addReversed(this, k);
62 }
63
64 public Numeric addReversed (Numeric x, int k)
65 {
66 if (dimensions() == Dimensions.Empty && x instanceof RealNum)
67 return new DFloNum (((RealNum)x).doubleValue () + k * factor);
68 throw new IllegalArgumentException ();
69 }
70
71 public Numeric mul (Object y)
72 {
73 if (y instanceof DQuantity)
74 return times(this, (DQuantity) y);
75 if (y instanceof RealNum)
76 return new DQuantity (factor * ((RealNum)y).doubleValue (), unit());
77 if (!(y instanceof Numeric))
78 throw new IllegalArgumentException ();
79 return ((Numeric)y).mulReversed(this);
80 }
81
82 public Numeric mulReversed (Numeric x)
83 {
84 if (x instanceof RealNum)
85 return new DQuantity (((RealNum)x).doubleValue () * factor, unit());
86 throw new IllegalArgumentException ();
87 }
88
89 public Numeric div (Object y)
90 {
91 if (y instanceof DQuantity)
92 {
93 DQuantity qy = (DQuantity) y;
94 if (dimensions() == qy.dimensions())
95 return new DFloNum ((factor * unit().doubleValue())
96 / (qy.factor * qy.unit().factor));
97 return divide(this, qy);
98 }
99 if (y instanceof RealNum)
100 return new DQuantity (factor / ((RealNum)y).doubleValue (), unit());
101 if (!(y instanceof Numeric))
102 throw new IllegalArgumentException ();
103 return ((Numeric)y).divReversed(this);
104 }
105
106 public Numeric divReversed (Numeric x)
107 {
108 if (x instanceof RealNum)
109 return new DQuantity (((RealNum)x).doubleValue () / factor,
110 Unit.divide(Unit.Empty, unit()));
111 throw new IllegalArgumentException ();
112 }
113
114
118
119 public void writeExternal(ObjectOutput out) throws IOException
120 {
121 out.writeDouble(factor);
122 out.writeObject(unt);
123 }
124
125 public void readExternal(ObjectInput in)
126 throws IOException, ClassNotFoundException
127 {
128 factor = in.readDouble();
129 unt = (Unit) in.readObject();
130 }
131 }
132 |
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