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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.proxy.interceptor.filter;
19  
20  import org.apache.commons.proxy.interceptor.MethodFilter;
21  
22  import java.lang.reflect.Method;
23  import java.util.Arrays;
24  import java.util.Collection;
25  import java.util.HashSet;
26  import java.util.Set;
27  
28  /**
29   * Filters methods based on their return type.
30   * @author James Carman
31   * @since 1.0
32   */
33  public class ReturnTypeFilter implements MethodFilter
34  {
35      private final Set validReturnTypes = new HashSet();
36  
37      public ReturnTypeFilter( Class[] validReturnTypes )
38      {
39          this( Arrays.asList( validReturnTypes ) );
40      }
41  
42      public ReturnTypeFilter( Collection validReturnTypes )
43      {
44          this.validReturnTypes.addAll( validReturnTypes );
45      }
46  
47      public boolean accepts( Method method )
48      {
49          return validReturnTypes.contains( method.getReturnType() );
50      }
51  }