StaticJavaBindingBuilder


1   /***
2    * Fractal ADL Parser
3    * Copyright (C) 2002-2004 France Telecom R&D
4    *
5    * This library is free software; you can redistribute it and/or
6    * modify it under the terms of the GNU Lesser General Public
7    * License as published by the Free Software Foundation; either
8    * version 2 of the License, or (at your option) any later version.
9    *
10   * This library is distributed in the hope that it will be useful,
11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   * Lesser General Public License for more details.
14   *
15   * You should have received a copy of the GNU Lesser General Public
16   * License along with this library; if not, write to the Free Software
17   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18   *
19   * Contact: Eric.Bruneton@rd.francetelecom.com
20   *
21   * Author: Eric Bruneton
22   */
23  
24  package org.objectweb.fractal.adl.bindings;
25  
26  import java.io.PrintWriter  ;
27  import java.util.ArrayList  ;
28  import java.util.HashSet  ;
29  import java.util.List  ;
30  import java.util.Map  ;
31  import java.util.Set  ;
32  import java.util.WeakHashMap  ;
33  
34  /**
35   * A Java based, static implementation of the {@link BindingBuilder} interface. 
36   * This implementation produces standard Java code that binds components. 
37   */
38  
39  public class StaticJavaBindingBuilder implements BindingBuilder {
40  
41    /**
42     * Associates a list of bindings to each context. The contexts are the last
43     * argument of the bindComponent method. The list of bindings for a context
44     * is the list of the primitive bindings that have been build so far in this
45     * context, as a list of Binding objects.
46     */
47    
48    private Map   bindingLists = new WeakHashMap  ();
49    
50    /**
51     * Associates a set of String to each context. This set contains code 
52     * fragments that have already been generated; it is used to avoid generating
53     * the same fragment several times.
54     */
55    
56    private Map   itfSets = new WeakHashMap  ();
57    
58    // --------------------------------------------------------------------------
59    // Implementation of the BindingBuilder interface
60    // --------------------------------------------------------------------------
61    
62    public void bindComponent (
63      final int type,
64      final Object   clientComp, 
65      final String   clientItf, 
66      final Object   serverComp, 
67      final String   serverItf, 
68      final Object   context)
69    {
70      Binding b = new Binding();
71      b.client = (String  )clientComp;
72      b.clientInterface = clientItf;
73      b.server = (String  )serverComp;
74      b.serverInterface = serverItf;
75          
76      List   bindings = (List  )bindingLists.get(context);
77      if (bindings == null) {
78        bindings = new ArrayList  ();
79        bindingLists.put(context, bindings);
80      }
81      bindings.add(b);
82      Set   itfs = (Set  )itfSets.get(context);
83      if (itfs == null) {
84        itfs = new HashSet  ();
85        itfSets.put(context, itfs);
86      }
87  
88      PrintWriter   pw = (PrintWriter  )((Map  )context).get("printwriter");
89      
90      // generate code to create direct bindings between the primitive components
91      for (int i = 0; i < bindings.size(); ++i) {
92        b = (Binding)bindings.get(i);
93        String   client = (String  )b.client;
94        String   clientInterface = b.clientInterface;
95        String   server = (String  )b.server;
96        String   serverInterface = b.serverInterface;
97        top: while (server != null && !server.startsWith("P")) {
98          for (int j = 0; j < bindings.size(); ++j) {
99            b = (Binding)bindings.get(j);
100           if (b.client.equals(server) && b.clientInterface.equals(serverInterface)) {
101             server = b.server;
102             serverInterface = b.serverInterface;
103             continue top;
104           }
105         }
106         server = null;
107       }
108       if (server != null) {
109         if (client.startsWith("P") ){
110           pw.print(client);
111           pw.print(".bindFc(\"");
112           pw.print(clientInterface);
113           pw.print("\",");
114           pw.print(server);
115           pw.println(");");
116           bindings.remove(i--);
117         } else {
118           StringBuffer   buf = new StringBuffer  (); 
119           buf.append(client);
120           buf.append(".put(\"");
121           buf.append(clientInterface);
122           buf.append("\",");
123           buf.append(server);
124           buf.append(");\n");
125           String   s = buf.toString();
126           if (!itfs.contains(s)) {
127             itfs.add(s);
128             pw.write(s);
129           }
130         }
131       }
132     }
133   }  
134 
135   // --------------------------------------------------------------------------
136   // Inner classes
137   // --------------------------------------------------------------------------
138   
139   static class Binding {
140     String   client;
141     String   clientInterface;
142     String   server;
143     String   serverInterface;
144   }
145 }
146
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