01: //--------------------------------------------------------------------------
02: // Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
03: // All rights reserved.
04: //
05: // Redistribution and use in source and binary forms, with or without
06: // modification, are permitted provided that the following conditions are
07: // met:
08: //
09: // Redistributions of source code must retain the above copyright notice,
10: // this list of conditions and the following disclaimer.
11: // Redistributions in binary form must reproduce the above copyright
12: // notice, this list of conditions and the following disclaimer in the
13: // documentation and/or other materials provided with the distribution.
14: // Neither the name of the Drew Davidson nor the names of its contributors
15: // may be used to endorse or promote products derived from this software
16: // without specific prior written permission.
17: //
18: // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19: // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20: // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21: // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22: // COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23: // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24: // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25: // OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26: // AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27: // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
28: // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
29: // DAMAGE.
30: //--------------------------------------------------------------------------
31: package ognl;
32:
33: import java.util.*;
34:
35: /**
36: * Default class resolution. Uses Class.forName() to look up classes by name.
37: * It also looks in the "java.lang" package if the class named does not give
38: * a package specifier, allowing easier usage of these classes.
39: * @author Luke Blanshard (blanshlu@netscape.net)
40: * @author Drew Davidson (drew@ognl.org)
41: */
42: public class DefaultClassResolver extends Object implements
43: ClassResolver {
44: private Map classes = new HashMap(101);
45:
46: public DefaultClassResolver() {
47: super ();
48: }
49:
50: public Class classForName(String className, Map context)
51: throws ClassNotFoundException {
52: Class result = null;
53:
54: if ((result = (Class) classes.get(className)) == null) {
55: try {
56: result = Class.forName(className);
57: } catch (ClassNotFoundException ex) {
58: if (className.indexOf('.') == -1) {
59: result = Class.forName("java.lang." + className);
60: classes.put("java.lang." + className, result);
61: }
62: }
63: classes.put(className, result);
64: }
65: return result;
66: }
67: }
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