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1   package org.apache.commons.beanutils2.transformers;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import java.lang.reflect.ParameterizedType;
23  import java.lang.reflect.Type;
24  
25  import org.apache.commons.beanutils2.Transformer;
26  
27  public abstract class AbstractTransformer<S, T>
28      implements Transformer<S, T>
29  {
30  
31      private final Type sourceType;
32  
33      private final Type targetType;
34  
35      public AbstractTransformer()
36      {
37          Type superclass = getClass().getGenericSuperclass();
38          if ( superclass instanceof Class )
39          {
40              throw new RuntimeException( "Missing type parameter." );
41          }
42          ParameterizedType parameterizedType = (ParameterizedType) superclass;
43          sourceType = parameterizedType.getActualTypeArguments()[0];
44          targetType = parameterizedType.getActualTypeArguments()[1];
45      }
46  
47      public final Type getSourceType()
48      {
49          return sourceType;
50      }
51  
52      public final Type getTargetType()
53      {
54          return targetType;
55      }
56  
57  }