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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;
19  
20  import org.apache.commons.proxy.Invocation;
21  import org.apache.commons.proxy.Interceptor;
22  
23  /**
24   * Decorates another <code>MethodInterceptor</code> by only calling it if the method is accepted by the supplied
25   * <code>MethodFilter</code>.
26   *
27   * @author James Carman
28   * @since 1.0
29   */
30  public class FilteredInterceptor implements Interceptor
31  {
32  //----------------------------------------------------------------------------------------------------------------------
33  // Fields
34  //----------------------------------------------------------------------------------------------------------------------
35  
36      private final Interceptor inner;
37      private final MethodFilter filter;
38  
39  //----------------------------------------------------------------------------------------------------------------------
40  // Constructors
41  //----------------------------------------------------------------------------------------------------------------------
42  
43      public FilteredInterceptor( Interceptor inner, MethodFilter filter )
44      {
45          this.inner = inner;
46          this.filter = filter;
47      }
48  
49  //----------------------------------------------------------------------------------------------------------------------
50  // MethodInterceptor Implementation
51  //----------------------------------------------------------------------------------------------------------------------
52  
53      public Object intercept( Invocation invocation ) throws Throwable
54      {
55          if( filter.accepts( invocation.getMethod() ) )
56          {
57              return inner.intercept( invocation );
58          }
59          else
60          {
61              return invocation.proceed();
62          }
63      }
64  }
65