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1 /*
2  * The Apache Software License, Version 1.1
3  *
4  * Copyright (c) 2002 The Apache Software Foundation. All rights
5  * reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  *
14  * 2. Redistributions in binary form must reproduce the above copyright
15  * notice, this list of conditions and the following disclaimer in
16  * the documentation and/or other materials provided with the
17  * distribution.
18  *
19  * 3. The end-user documentation included with the redistribution, if
20  * any, must include the following acknowlegement:
21  * "This product includes software developed by the
22  * Apache Software Foundation (http://www.apache.org/)."
23  * Alternately, this acknowlegement may appear in the software itself,
24  * if and wherever such third-party acknowlegements normally appear.
25  *
26  * 4. The names "Apache BSF", "Apache", and "Apache Software Foundation"
27  * must not be used to endorse or promote products derived from
28  * this software without prior written permission. For written
29  * permission, please contact apache@apache.org.
30  *
31  * 5. Products derived from this software may not be called "Apache"
32  * nor may "Apache" appear in their names without prior written
33  * permission of the Apache Group.
34  *
35  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46  * SUCH DAMAGE.
47  * ====================================================================
48  *
49  * This software consists of voluntary contributions made by many individuals
50  * on behalf of the Apache Software Foundation and was originally created by
51  * Sanjiva Weerawarana and others at International Business Machines
52  * Corporation. For more information on the Apache Software Foundation,
53  * please see <http://www.apache.org/>.
54  */
55
56 package org.apache.bsf.util;
57
58 import java.rmi.RemoteException JavaDoc;
59
60 import java.util.Enumeration JavaDoc;
61 import java.util.Vector JavaDoc;
62
63 import org.apache.bsf.*;
64 import org.apache.bsf.debug.*;
65
66 public class LangCell {
67
68     String JavaDoc m_lang;
69     Vector JavaDoc m_engines;
70     BSFDebugger m_debugger;
71
72     LangCell(String JavaDoc lang) {
73         m_lang = lang;
74         m_engines = new Vector JavaDoc();
75     }
76     
77     void terminateNotify() {
78         disconnectDebugger();
79     }
80     
81     void disconnectDebugger() {
82         
83         m_debugger = null;
84         
85         // Then make sure that all engines are
86 // told that we disconnected their debugger
87 // so that they can dropped their callback...
88
89         BSFEngine eng;
90         Object JavaDoc debugProxy;
91         Enumeration JavaDoc e;
92         e = m_engines.elements();
93         while (e.hasMoreElements()) {
94             eng = (BSFEngine) e.nextElement();
95             eng.disconnectedDebuggerNotify();
96         }
97     }
98     void setDebugger(BSFDebugger debugger) {
99         
100         if (m_debugger!=null) {
101             disconnectDebugger();
102         }
103         m_debugger = debugger;
104         if (m_debugger == null)
105             return;
106                     
107         // notify the new registered debugger about the engines
108 // we already know about for the specified language.
109
110         BSFEngine eng;
111         Object JavaDoc debugInterface;
112         Enumeration JavaDoc e;
113         e = m_engines.elements();
114         while (e.hasMoreElements()) {
115             eng = (BSFEngine) e.nextElement();
116             debugInterface = eng.getSpecificDebuggingInterface();
117             try {
118                 m_debugger.createdEngine(m_lang, debugInterface);
119             } catch (RemoteException JavaDoc ex) {
120                 disconnectDebugger();
121             }
122         }
123     }
124     
125     BSFDebugger getDebugger() {
126         return m_debugger;
127     }
128     
129     void addEngine(BSFEngine eng) {
130         m_engines.addElement(eng);
131
132         if (m_debugger!=null) {
133             Object JavaDoc debugInterface;
134             debugInterface = eng.getSpecificDebuggingInterface();
135             try {
136                 m_debugger.createdEngine(m_lang,debugInterface);
137             } catch (RemoteException JavaDoc ex) {
138                 disconnectDebugger();
139             }
140         }
141     }
142
143     void removeEngine(BSFEngine eng) {
144         m_engines.removeElement(eng);
145         if (m_debugger!=null) {
146             Object JavaDoc debugInterface;
147             debugInterface = eng.getSpecificDebuggingInterface();
148             try {
149                 m_debugger.deletedEngine(debugInterface);
150             } catch (RemoteException JavaDoc ex) {
151                 disconnectDebugger();
152             }
153         }
154     }
155
156     Enumeration JavaDoc engines() {
157         return m_engines.elements();
158     }
159 }
160
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