1 /*
2 * Copyright 2002-2004 The Apache Software Foundation
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.apache.commons.clazz;
17
18 import java.util.HashMap;
19
20 import org.apache.commons.clazz.common.GroupClazzLoader;
21
22 /**
23 * An implementation of <code>ClazzLoader</code> that functions as the top-
24 * level clazz loader for a model and caches all clazzes by name.
25 *
26 * @author <a href="mailto:dmitri@apache.org">Dmitri Plotnikov</a>
27 * @version $Id: ModelClazzLoader.java 155436 2005-02-26 13:17:48Z dirkv $
28 */
29 public class ModelClazzLoader extends GroupClazzLoader {
30
31 private String model;
32 private HashMap clazzMap = new HashMap();
33
34 public ModelClazzLoader(String model) {
35 super(null);
36 this.model = model;
37 }
38
39 public String getModel() {
40 return model;
41 }
42
43 /**
44 * @see ClazzLoader#getClazzForName(String)
45 */
46 public Clazz getClazzForName(String name) {
47 Clazz clazz = (Clazz) clazzMap.get(name);
48 if (clazz == null) {
49 clazz = super.getClazzForName(name);
50 if (clazz != null) {
51 clazzMap.put(name, clazz);
52 }
53 }
54 return clazz;
55 }
56
57 /**
58 * @see ClazzLoader#defineClazz(String, Class, Class)
59 */
60 public Clazz defineClazz(
61 String name,
62 Class clazzType,
63 Class instanceClass)
64 {
65 Clazz clazz = super.defineClazz(name, clazzType, instanceClass);
66 if (clazz != null) {
67 clazzMap.put(name, clazz);
68 }
69 return clazz;
70 }
71 }