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1   /*
2    * $Id: InterceptorStack.java 19887 2010-10-13 14:58:55Z dfeist $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  
11  package org.mule.interceptor;
12  
13  import org.mule.api.MuleEvent;
14  import org.mule.api.MuleException;
15  import org.mule.api.interceptor.Interceptor;
16  import org.mule.api.lifecycle.Disposable;
17  import org.mule.api.lifecycle.Initialisable;
18  import org.mule.api.lifecycle.InitialisationException;
19  import org.mule.api.processor.MessageProcessor;
20  import org.mule.processor.AbstractInterceptingMessageProcessor;
21  import org.mule.processor.chain.DefaultMessageProcessorChainBuilder;
22  
23  import java.util.List;
24  
25  /**
26   * Maintains a list of interceptors that can be applied to components.
27   */
28  public class InterceptorStack extends AbstractInterceptingMessageProcessor
29      implements Interceptor, Initialisable, Disposable
30  {
31  
32      private List<Interceptor> interceptors;
33      private MessageProcessor chain;
34  
35      public InterceptorStack()
36      {
37          // For spring
38      }
39  
40      public InterceptorStack(List<Interceptor> interceptors)
41      {
42          this.interceptors = interceptors;
43      }
44  
45      public MuleEvent process(MuleEvent event) throws MuleException
46      {
47          return chain.process(event);
48      }
49  
50      public List<Interceptor> getInterceptors()
51      {
52          return interceptors;
53      }
54  
55      public void setInterceptors(List<Interceptor> interceptors)
56      {
57          this.interceptors = interceptors;
58      }
59  
60      public void initialise() throws InitialisationException
61      {
62          DefaultMessageProcessorChainBuilder chainBuilder = new DefaultMessageProcessorChainBuilder();
63          for (Interceptor interceptor : interceptors)
64          {
65              if (interceptor instanceof Initialisable)
66              {
67                  ((Initialisable) interceptor).initialise();
68              }
69              chainBuilder.chain(interceptor);
70          }
71          if (next != null)
72          {
73              chainBuilder.chain(next);
74          }
75          try
76          {
77              chain = chainBuilder.build();
78          }
79          catch (MuleException e)
80          {
81              throw new InitialisationException(e, this);
82          }
83      }
84  
85      public void dispose()
86      {
87          for (Interceptor interceptor : interceptors)
88          {
89              if (interceptor instanceof Disposable)
90              {
91                  ((Disposable) interceptor).dispose();
92              }
93          }
94      }
95  
96      @Override
97      public int hashCode()
98      {
99          final int prime = 31;
100         int result = 1;
101         result = prime * result + ((interceptors == null) ? 0 : interceptors.hashCode());
102         return result;
103     }
104 
105     @Override
106     public boolean equals(Object obj)
107     {
108         if (this == obj) return true;
109         if (obj == null) return false;
110         if (getClass() != obj.getClass()) return false;
111         InterceptorStack other = (InterceptorStack) obj;
112         if (interceptors == null)
113         {
114             if (other.interceptors != null) return false;
115         }
116         else if (!interceptors.equals(other.interceptors)) return false;
117         return true;
118     }
119 
120 }