SimpleInstrumentableClassLoader


1   /*
2    * Copyright 2002-2006 the original author or authors.
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  
17  package org.springframework.instrument.classloading;
18  
19  import java.lang.instrument.ClassFileTransformer  ;
20  
21  import org.springframework.core.OverridingClassLoader;
22  
23  /**
24   * Simplistic implementation of an instrumentable ClassLoader.
25   * Usable in tests and standalone environments.
26   *
27   * @author Rod Johnson
28   * @author Costin Leau
29   * @since 2.0
30   */
31  public class SimpleInstrumentableClassLoader extends OverridingClassLoader  {
32  
33      private final WeavingTransformer weavingTransformer;
34  
35  
36      /**
37       * Create a new SimpleLoadTimeWeaver for the given class loader.
38       * @param parent the ClassLoader to build an simple instrumentable
39       * ClassLoader for
40       */
41      public SimpleInstrumentableClassLoader(ClassLoader   parent) {
42          super(parent);
43          this.weavingTransformer = new WeavingTransformer(parent);
44      }
45  
46  
47      /**
48       * Add a class file transformer to be applied by this ClassLoader.
49       * @param transformer the class file transformer to register
50       */
51      public void addTransformer(ClassFileTransformer   transformer) {
52          this.weavingTransformer.addTransformer(transformer);
53      }
54  
55  
56      @Override  
57      protected byte[] transformIfNecessary(String   name, byte[] bytes) {
58          return this.weavingTransformer.transformIfNecessary(name, bytes);
59      }
60  
61  }
62
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