1//
2//  ========================================================================
3//  Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
4//  ------------------------------------------------------------------------
5//  All rights reserved. This program and the accompanying materials
6//  are made available under the terms of the Eclipse Public License v1.0
7//  and Apache License v2.0 which accompanies this distribution.
8//
9//      The Eclipse Public License is available at
10//      http://www.eclipse.org/legal/epl-v10.html
11//
12//      The Apache License v2.0 is available at
13//      http://www.opensource.org/licenses/apache2.0.php
14//
15//  You may elect to redistribute this code under either of these licenses.
16//  ========================================================================
17//
18
19package org.eclipse.jetty.webapp;
20
21import org.eclipse.jetty.util.Loader;
22import org.eclipse.jetty.util.log.Log;
23import org.eclipse.jetty.util.log.Logger;
24import org.eclipse.jetty.util.resource.Resource;
25
26/**
27 * DiscoveredAnnotation
28 *
29 * Represents an annotation that has been discovered
30 * by scanning source code of WEB-INF/classes and WEB-INF/lib jars.
31 *
32 */
33public abstract class DiscoveredAnnotation
34{
35    private static final Logger LOG = Log.getLogger(DiscoveredAnnotation.class);
36
37    protected WebAppContext _context;
38    protected String _className;
39    protected Class<?> _clazz;
40    protected Resource _resource; //resource it was discovered on, can be null (eg from WEB-INF/classes)
41
42    public abstract void apply();
43
44    public DiscoveredAnnotation (WebAppContext context, String className)
45    {
46        this(context,className, null);
47    }
48
49
50    public DiscoveredAnnotation(WebAppContext context, String className, Resource resource)
51    {
52        _context = context;
53        _className = className;
54        _resource = resource;
55    }
56
57    public Resource getResource ()
58    {
59        return _resource;
60    }
61
62    public Class<?> getTargetClass()
63    {
64        if (_clazz != null)
65            return _clazz;
66
67        loadClass();
68
69        return _clazz;
70    }
71
72    private void loadClass ()
73    {
74        if (_clazz != null)
75            return;
76
77        if (_className == null)
78            return;
79
80        try
81        {
82            _clazz = Loader.loadClass(null, _className);
83        }
84        catch (Exception e)
85        {
86            LOG.warn(e);
87        }
88    }
89}
90