InterceptorsChain


1   /*
2    * Copyright 2003-2006 the original author or authors.
3    * Licensed under the Apache License, Version 2.0 (the "License");
4    * you may not use this file except in compliance with the License.
5    * You may obtain a copy of the License at
6    *
7    * http://www.apache.org/licenses/LICENSE-2.0
8    *
9    * Unless required by applicable law or agreed to in writing, software
10   * distributed under the License is distributed on an "AS IS" BASIS,
11   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12   * See the License for the specific language governing permissions and
13   * limitations under the License.
14   * 
15   */
16  package com.jdon.aop.interceptor;
17  
18  import java.util.ArrayList  ;
19  import java.util.HashMap  ;
20  import java.util.List  ;
21  import java.util.Map  ;
22  
23  import org.aopalliance.intercept.MethodInterceptor;
24  
25  import com.jdon.aop.joinpoint.Pointcut;
26  import com.jdon.container.pico.Startable;
27  import com.jdon.util.Debug;
28  
29  
30  /**
31   * Interceptors chain
32   * 
33   * all interceptors will add in this collection
34   * 
35   * @author <a HREF="mailto:banqiao@jdon.com">banq</a>
36   *
37   */
38  public class InterceptorsChain implements Startable{
39      private final static String   module = InterceptorsChain.class.getName();
40      public final static String   NAME = "InterceptorsChain";
41      
42      /**
43       * the key is interceptor target
44       * the value is the interceptor instance
45       */
46      private Map   chain = new HashMap  ();
47      
48      public void start(){
49          Debug.logVerbose("[JdonFramework]InterceptorsChain start..", module);
50      }
51      
52      public void stop(){
53          chain.clear();
54      }
55    
56      public void addInterceptor(String   pointcut, MethodInterceptor interceptor ){
57          List   interceptors = getInterceptors(pointcut);
58          if ((interceptors == null) && isPointcut(pointcut)){
59              interceptors = new ArrayList  ();
60              chain.put(pointcut, interceptors);
61          }
62          interceptors.add(interceptor);
63      }
64      
65      private boolean isPointcut(String   pointcut){
66          if ((pointcut.equals(Pointcut.TARGET_PROPS_SERVICES)) ||
67              (pointcut.equals(Pointcut.EJB_TARGET_PROPS_SERVICES)) ||
68              (pointcut.equals(Pointcut.POJO_TARGET_PROPS_SERVICES)))
69              return true;
70          else 
71              return false;            
72      }
73      
74      
75      /**
76       * @return Returns the interceptors.
77       */
78      public List   getInterceptors(String   pointcut) {
79          return (List  )chain.get(pointcut);
80      }
81      
82      public int size(){
83          return chain.size();
84      }
85  }
86
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