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