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1   /*
2    * $Id: InterceptorStack.java 21307 2011-02-17 15:35:44Z 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          chainBuilder.setName("interceptor stack");
64          for (Interceptor interceptor : interceptors)
65          {
66              if (interceptor instanceof Initialisable)
67              {
68                  ((Initialisable) interceptor).initialise();
69              }
70              chainBuilder.chain(interceptor);
71          }
72          if (next != null)
73          {
74              chainBuilder.chain(next);
75          }
76          try
77          {
78              chain = chainBuilder.build();
79          }
80          catch (MuleException e)
81          {
82              throw new InitialisationException(e, this);
83          }
84      }
85  
86      public void dispose()
87      {
88          for (Interceptor interceptor : interceptors)
89          {
90              if (interceptor instanceof Disposable)
91              {
92                  ((Disposable) interceptor).dispose();
93              }
94          }
95      }
96  
97      @Override
98      public int hashCode()
99      {
100         final int prime = 31;
101         int result = 1;
102         result = prime * result + ((interceptors == null) ? 0 : interceptors.hashCode());
103         return result;
104     }
105 
106     @Override
107     public boolean equals(Object obj)
108     {
109         if (this == obj) return true;
110         if (obj == null) return false;
111         if (getClass() != obj.getClass()) return false;
112         InterceptorStack other = (InterceptorStack) obj;
113         if (interceptors == null)
114         {
115             if (other.interceptors != null) return false;
116         }
117         else if (!interceptors.equals(other.interceptors)) return false;
118         return true;
119     }
120 
121 }