|
|||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
ClassResolver.java | - | - | - | - |
|
1 | // Copyright 2004, 2005 The Apache Software Foundation | |
2 | // | |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 | // you may not use this file except in compliance with the License. | |
5 | // You may obtain a copy of the License at | |
6 | // | |
7 | // http://www.apache.org/licenses/LICENSE-2.0 | |
8 | // | |
9 | // Unless required by applicable law or agreed to in writing, software | |
10 | // distributed under the License is distributed on an "AS IS" BASIS, | |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 | // See the License for the specific language governing permissions and | |
13 | // limitations under the License. | |
14 | ||
15 | package org.apache.hivemind; | |
16 | ||
17 | import java.net.URL; | |
18 | ||
19 | /** | |
20 | * An object which is used to resolve classes and class-path resources. This is needed because, in | |
21 | * an application server, different class loaders may be involved in loading different HiveMind | |
22 | * modules. For example, the HiveMind library may be on the system claasspath, and modules may | |
23 | * include EJBs and WARs, each loaded by a different classloader. | |
24 | * <p> | |
25 | * The class loader for the framework needs to be able to see resources in the application, but the | |
26 | * application's class loader is a descendent of the framework's class loader. To resolve this, we | |
27 | * need a 'hook', an instance that provides access to the application's class loader. | |
28 | * | |
29 | * @author Howard Lewis Ship | |
30 | */ | |
31 | ||
32 | public interface ClassResolver | |
33 | { | |
34 | /** | |
35 | * Forwarded, unchanged, to the class loader. Returns null if the resource is not found. | |
36 | */ | |
37 | ||
38 | public URL getResource(String name); | |
39 | ||
40 | /** | |
41 | * Forwarded, to the the method <code>Class.forName(String, boolean, ClassLoader)</code>, | |
42 | * using the resolver's class loader. | |
43 | * <p> | |
44 | * Since 1.1, the type may include primitive types and arrays (of primitives or of objects). | |
45 | * | |
46 | * @throws ApplicationRuntimeException | |
47 | * on any error. | |
48 | */ | |
49 | ||
50 | public Class findClass(String type); | |
51 | ||
52 | /** | |
53 | * Like {@link #findClass(String)}, but simply returns null if the class does not exist (i.e., | |
54 | * if {@link ClassNotFoundException} is thrown). This is used in certain spots when (typically) | |
55 | * the exact package for a class is not known. | |
56 | */ | |
57 | ||
58 | public Class checkForClass(String type); | |
59 | ||
60 | /** | |
61 | * Returns a {@link java.lang.ClassLoader} that can see all the classes the resolver can access. | |
62 | */ | |
63 | ||
64 | public ClassLoader getClassLoader(); | |
65 | } |
|