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Java > Open Source Codes > org > apache > commons > discovery > jdk > JDKHooks


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61
62 package org.apache.commons.discovery.jdk;
63
64 import java.util.Enumeration JavaDoc;
65 import java.io.IOException JavaDoc;
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 JavaDoc 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 JavaDoc getSystemClassLoader();
106     
107     public abstract Enumeration JavaDoc getResources(ClassLoader JavaDoc loader,
108                                              String JavaDoc resourceName)
109         throws IOException JavaDoc;
110 }
111
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