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Java > Open Source Codes > com > caucho > aop > AopCallChain


1 /*
2  * Copyright (c) 1998-2004 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  *
23  * Free Software Foundation, Inc.
24  * 59 Temple Place, Suite 330
25  * Boston, MA 02111-1307 USA
26  *
27  * @author Scott Ferguson
28  */
29
30 package com.caucho.aop;
31
32 import java.io.IOException;
33
34 import com.caucho.util.L10N;
35
36 import com.caucho.java.JavaWriter;
37
38 import com.caucho.java.gen.FilterCallChain;
39 import com.caucho.java.gen.CallChain;
40
41 /**
42  * Enhancing a method objects.
43  */
44 public class AopCallChain extends FilterCallChain {
45   private static final L10N L = new L10N(AopCallChain.class);
46
47   private AopVarComponent _aopVar;
48   
49   public AopCallChain(CallChain next, AopVarComponent var)
50   {
51     super(next);
52     
53     _aopVar = var;
54   }
55
56   /**
57    * Generates the code for the method call.
58    *
59    * @param out the writer to the output stream.
60    * @param retVar the variable to hold the return value
61    * @param var the object to be called
62    * @param args the method arguments
63    */
64   public void generateCall(JavaWriter out, String retVar,
65                String var, String []args)
66     throws IOException
67   {
68     String fieldName = _aopVar.getFieldName();
69     
70     out.print(fieldName + " invocation");
71     out.print(" = new " + fieldName + "(this");
72
73     for (int i = 0; i < args.length; i++) {
74       out.print(", ");
75       out.print(args[i]);
76     }
77     out.println(");");
78
79     out.println("try {");
80     out.pushDepth();
81     
82     out.println("Object result = invocation._interceptor.invoke(invocation);");
83
84     out.popDepth();
85     out.println("} catch (Throwable e) {");
86     out.println(" throw new RuntimeException(e);");
87     out.println("}");
88   }
89 }
90
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