Codifier


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15    * Lesser General Public License for more details.
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22  package org.jboss.aop.instrument;
23  
24  import java.util.ArrayList  ;
25  import java.util.Collection  ;
26  import java.util.Iterator  ;
27  
28  import javassist.CannotCompileException;
29  import javassist.CtMethod;
30  
31  /**
32   * Register pending codes, so that they can be added
33   * to a class bytecode in a later moment.
34   * @author Flavia Rainone
35   */
36  public class Codifier
37  {
38  
39     private Collection   pendingCodes;
40     
41     /**
42      * Constructor.
43      */
44     public Codifier()
45     {
46        this.pendingCodes = new ArrayList  ();
47     }
48     
49     /**
50      * Register the body of <code>method</code> as a pending code.
51      * @param method the method whose body will be <code>coded</code> in a later moment.
52      * @param body the future body of <code>method</code>.
53      */
54     public synchronized void addPendingCode(CtMethod method, String   body)
55     {
56        PendingCode pendingCode = new PendingCode(method, body);
57        this.pendingCodes.add(pendingCode);
58     }
59     
60     /**
61      * Deploys pending code. In other words: changes the body of methods to their
62      * pending bodies, which must have been registered through <code>addPendingCode</code>
63      * method.
64      * @throws CannotCompileException thrown if javassist cannot compile a pending code,
65      * registered through <code>addPendingCode</code> method.
66      */
67     public synchronized void codifyPending() throws CannotCompileException
68     {
69        for (Iterator   iterator = pendingCodes.iterator(); iterator.hasNext();)
70        {
71           PendingCode pendingCode = (PendingCode) iterator.next();
72           pendingCode.method.setBody(pendingCode.body);
73        }
74        pendingCodes.clear();
75     }
76     
77     /**
78      * Represents a pending code, to be applied to a method body in the appropriate moment.
79      */
80     private class PendingCode
81     {
82        CtMethod method;
83        String   body;
84        
85        public PendingCode(CtMethod method, String   body)
86        {
87           this.method = method;
88           this.body = body;
89        }
90     }
91  }
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