1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * This library is free software; you can redistribute it and/or modify it under
5    * the terms of the GNU Lesser General Public License as published by the Free
6    * Software Foundation; either version 2.1 of the License, or (at your option)
7    * any later version.
8    *
9    * This library is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11   * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12   * details.
13   */
14  
15  package com.liferay.portlet.unitconverter.util;
16  
17  import com.liferay.portlet.unitconverter.model.Conversion;
18  
19  /**
20   * <a href="ConverterUtil.java.html"><b><i>View Source</i></b></a>
21   *
22   * @author James Lefeu
23   */
24  public class ConverterUtil {
25  
26      public static int TEMPERATURE_CELSIUS = 1;
27  
28      public static int TEMPERATURE_FAHRENHEIHT = 2;
29  
30      public static Conversion getConversion(int type, int fromId,
31                                             int toId, double fromValue) {
32          double toValue = 0;
33  
34          if (type == 0) {
35              toValue = convertLength(fromId, toId, fromValue);
36          }
37          else if (type == 1) {
38              toValue = convertArea(fromId, toId, fromValue);
39          }
40          else if (type == 2) {
41              toValue = convertVolume(fromId, toId, fromValue);
42          }
43          else if (type == 3) {
44              toValue = convertMass(fromId, toId, fromValue);
45          }
46          else if (type == 4) {
47              toValue = convertTemperature(fromId, toId, fromValue);
48          }
49  
50          return new Conversion(type, fromId, toId, fromValue, toValue);
51      }
52  
53      public static double convertArea(int fromId, int toId, double fromValue) {
54          return (fromValue / _AREA[fromId]) * _AREA[toId];
55      }
56  
57      public static double convertLength(int fromId, int toId, double fromValue) {
58          return (fromValue / _LENGTH[fromId]) * _LENGTH[toId];
59      }
60  
61      public static double convertMass(int fromId, int toId, double fromValue) {
62          return (fromValue / _MASS[fromId]) * _MASS[toId];
63      }
64  
65      public static double convertTemperature(int fromId, int toId,
66                                              double fromValue) {
67          return _fromTemperature(toId, _toTemperature(fromId, fromValue));
68      }
69  
70      public static double convertVolume(int fromId, int toId, double fromValue) {
71          return (fromValue / _VOLUME[fromId]) * _VOLUME[toId];
72      }
73  
74      private final static double _fromTemperature(int toId, double fromValue) {
75          if (toId == 0) {
76              return fromValue;                   // Kelvin
77          }
78          else if (toId == 1) {
79              return fromValue - 273.15;          // Celsius
80          }
81          else if (toId == 2) {
82              return (1.8 * fromValue) - 459.67;  // Fahrenheit
83          }
84          else if (toId == 3) {
85              return 1.8 * fromValue;             // Rankine
86          }
87          else if (toId == 4) {
88              return .8 * (fromValue - 273.15);   // R?aumure
89          }
90          else {
91              return 0;
92          }
93      }
94  
95      private final static double _toTemperature(int fromId, double fromValue) {
96          if (fromId == 0) {                      // Kelvin
97              return fromValue;
98          }
99          else if (fromId == 1) {                 // Celsius
100             return fromValue + 273.15;
101         }
102         else if (fromId == 2) {                 // Fahrenheit
103             return .5555555555 * (fromValue + 459.67);
104         }
105         else if (fromId == 3) {                 // Rankine
106             return .5555555555 * fromValue;
107         }
108         else if (fromId == 4) {
109             return (1.25 * fromValue) + 273.15; // R?aumure
110         }
111         else {
112             return 0;
113         }
114     }
115 
116     private final static double _AREA[] = new double[] {
117         1.0,                // Square Kilometer
118         1000000.0,          // Square Meter
119         10000000000.0,      // Square Centimeter
120         1000000000000.0,    // Square Millimeter
121         10763910,           // Square Foot
122         1550003000,         // Square Inch
123         1195990,            // Square Yard
124         0.3861022,          // Square Mile
125         100,                // Hectare
126         247.1054,           // Acre
127     };
128 
129     private final static double _LENGTH[] = new double[] {
130         1.0,                // Meter
131         1000.0,             // Millimeter
132         100.0,              // Centimeter
133         0.001,              // Kilometer
134         3.28084,            // Foot
135         39.37008,           // Inch
136         1.093613,           // Yard
137         0.000621,           // Mile
138         2.187227,           // Cubit
139         4.374453,           // Talent
140         13.12336            // Handbreath
141     };
142 
143     private final static double _MASS[] = new double[] {
144         1.0,                // Kilogram
145         2.204623,           // Pound
146         0.00110,            // Ton
147         0.02939497,         // Talent
148         1.763698,           // Mina
149         88.18491,           // Shekel
150         132.2774,           // Pim
151         176.2698,           // Beka
152         1763.698,           // Gerah
153     };
154 
155     private final static double _VOLUME[] = new double[] {
156         1.0,                // Liter
157         1000,               // Cubic Centimeter
158         61.02374,           // Cubic Inch (Liquid Measure)
159         1.816166,           // Pint (Dry Measure)
160         0.004729599,        // Cor (Homer)
161         0.009459198,        // Lethek
162         0.04729599,         // Ephah
163         0.141888,           // Seah
164         0.4729599,          // Omer
165         0.851328,           // Cab
166         0.04402868,         // Bath
167         0.2641721,          // Hin
168         3.170065,           // Log
169     };
170 
171 }