Platform


1   /*
2    * EJTools, the Enterprise Java Tools
3    *
4    * Distributable under LGPL license.
5    * See terms of license at www.gnu.org.
6    */
7   package org.ejtools.util;
8   
9   
10  /**
11   * Description of the Class
12   *
13   * @author    Laurent Etiemble
14   * @version   $Revision: 1.2 $
15   */
16  public class Platform
17  {
18     /** Description of the Field */
19     private static String   JAVA_VERSION;
20     /** Description of the Field */
21     public final static boolean IS_JAVA_1_1 = Platform.getJavaVersionMatches(Platform.JAVA_1_1);
22     /** Description of the Field */
23     public final static boolean IS_JAVA_1_2 = Platform.getJavaVersionMatches(Platform.JAVA_1_2);
24     /** Description of the Field */
25     public final static boolean IS_JAVA_1_3 = Platform.getJavaVersionMatches(Platform.JAVA_1_3);
26     /** Description of the Field */
27     public final static boolean IS_JAVA_1_4 = Platform.getJavaVersionMatches(Platform.JAVA_1_4);
28     /** Description of the Field */
29     public final static boolean IS_JAVA_1_5 = Platform.getJavaVersionMatches(Platform.JAVA_1_5);
30     /** Description of the Field */
31     public final static String   JAVA_1_1 = "1.1";
32     /** Description of the Field */
33     public final static String   JAVA_1_2 = "1.2";
34     /** Description of the Field */
35     public final static String   JAVA_1_3 = "1.3";
36     /** Description of the Field */
37     public final static String   JAVA_1_4 = "1.4";
38     /** Description of the Field */
39     public final static String   JAVA_1_5 = "1.5";
40  
41  
42     /** Avoid instantiation */
43     private Platform() { }
44  
45  
46     /**
47      * Gets the javaVersion attribute of the Platform class
48      *
49      * @return   The javaVersion value
50      */
51     public static String   getJavaVersion()
52     {
53        if (JAVA_VERSION == null)
54        {
55           JAVA_VERSION = System.getProperty("java.version");
56        }
57        return JAVA_VERSION;
58     }
59  
60  
61     /**
62      * Gets the javaVersionCompatible attribute of the Platform class
63      *
64      * @param version  Description of the Parameter
65      * @return         The javaVersionCompatible value
66      */
67     public static boolean isJavaVersionCompatible(String   version)
68     {
69        if (getJavaVersion() == null)
70        {
71           return false;
72        }
73        return (JAVA_VERSION.compareTo(version) >= 0);
74     }
75  
76  
77     /**
78      * Gets the javaVersionMatches attribute of the Platform class
79      *
80      * @param versionPrefix  Description of the Parameter
81      * @return               The javaVersionMatches value
82      */
83     private static boolean getJavaVersionMatches(String   versionPrefix)
84     {
85        if (getJavaVersion() == null)
86        {
87           return false;
88        }
89        return JAVA_VERSION.startsWith(versionPrefix);
90     }
91  }
92
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