01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.commons.discovery.jdk;
18:
19: import java.util.Enumeration;
20: import java.io.IOException;
21:
22: /**
23: * @author Richard A. Sitze
24: */
25: public abstract class JDKHooks {
26: private static final JDKHooks jdkHooks;
27:
28: static {
29: jdkHooks = new JDK12Hooks();
30: }
31:
32: protected JDKHooks() {
33: }
34:
35: /**
36: * Return singleton object representing JVM hooks/tools.
37: *
38: * TODO: add logic to detect JDK level.
39: */
40: public static final JDKHooks getJDKHooks() {
41: return jdkHooks;
42: }
43:
44: /**
45: * Get the system property
46: *
47: * @param propName name of the property
48: * @return value of the property
49: */
50: public abstract String getSystemProperty(final String propName);
51:
52: /**
53: * The thread context class loader is available for JDK 1.2
54: * or later, if certain security conditions are met.
55: *
56: * @return The thread context class loader, if available.
57: * Otherwise return null.
58: */
59: public abstract ClassLoader getThreadContextClassLoader();
60:
61: /**
62: * The system class loader is available for JDK 1.2
63: * or later, if certain security conditions are met.
64: *
65: * @return The system class loader, if available.
66: * Otherwise return null.
67: */
68: public abstract ClassLoader getSystemClassLoader();
69:
70: public abstract Enumeration getResources(ClassLoader loader,
71: String resourceName) throws IOException;
72: }
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