JDKHooks


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61  
62  package org.apache.commons.discovery.jdk;
63  
64  import java.util.Enumeration  ;
65  import java.io.IOException  ;
66  
67  
68  /**
69   * @author Richard A. Sitze
70   */
71  public abstract class JDKHooks {
72      private static final JDKHooks jdkHooks;
73      
74      static {
75          jdkHooks = new JDK12Hooks();
76      }
77      
78      protected JDKHooks() { }
79      
80      /**
81       * Return singleton object representing JVM hooks/tools.
82       * 
83       * TODO: add logic to detect JDK level.
84       */
85      public static final JDKHooks getJDKHooks() {
86          return jdkHooks;
87      }
88  
89      /**
90       * The thread context class loader is available for JDK 1.2
91       * or later, if certain security conditions are met.
92       * 
93       * @return The thread context class loader, if available.
94       *         Otherwise return null.
95       */
96      public abstract ClassLoader   getThreadContextClassLoader();
97  
98      /**
99       * The system class loader is available for JDK 1.2
100      * or later, if certain security conditions are met.
101      * 
102      * @return The system class loader, if available.
103      *         Otherwise return null.
104      */
105     public abstract ClassLoader   getSystemClassLoader();
106     
107     public abstract Enumeration   getResources(ClassLoader   loader,
108                                              String   resourceName)
109         throws IOException  ;
110 }
111
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