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Java > Open Source Codes > gnu > kawa > servlet > KawaServlet


1 // Copyright (c) 2001 Per M.A. Bothner and Brainfood Inc.
2 // This is free software; for terms and warranty disclaimer see ./COPYING.
3
4 package gnu.kawa.servlet;
5 import javax.servlet.*;
6 import javax.servlet.http.*;
7 import gnu.mapping.*;
8 import gnu.xml.*;
9 import java.io.IOException JavaDoc;
10
11 public abstract class KawaServlet
12 extends HttpServlet
13 {
14   public abstract void run(CallContext ctx) throws Throwable JavaDoc;
15
16    public void doPost (HttpServletRequest request,
17                HttpServletResponse response)
18      throws ServletException, IOException JavaDoc
19   {
20     doGet(request, response);
21   }
22
23   public void doGet(HttpServletRequest request, HttpServletResponse response)
24     throws ServletException, IOException JavaDoc
25   {
26     CallContext ct = CallContext.getOnlyInstance();
27     ServletCallContext ctx;
28     if (ct instanceof ServletCallContext)
29       {
30     ctx = (ServletCallContext) ct;
31       }
32     else
33       {
34     ctx = new ServletCallContext();
35     CallContext.setInstance(ctx);
36       }
37     ctx.consumer = new ServletPrinter(response); // FIXME - should re-use
38 ctx.request = request;
39     ctx.response = response;
40     ctx.servlet = this;
41     ctx.values = Values.noArgs;
42
43     /* FIXME should use fluid binding - or ThreadLocation!
44     gnu.expr.Language language = gnu.expr.Language.getDefaultLanguage();
45     String lang = language.getName();
46     Environment env = Environment.getCurrent();
47     if (lang == "XQuery")
48       {
49     env.defineValue("request", request);
50     env.defineValue("response", response);
51     env.defineValue("servlet", this);
52     env.defineValue("out", out);
53       }
54     else
55       {
56     env.defineValue("*request*", request);
57     env.defineValue("*response*", response);
58     env.defineValue("*servlet*", this);
59     env.defineValue("*out*", out);
60       }
61     */
62
63     ctx.consumer.beginDocument();
64     try
65       {
66     run(ctx);
67       }
68     catch (Throwable JavaDoc throwable)
69       {
70     // Clear partial output on an error.
71 response.resetBuffer();
72     if (throwable instanceof WrappedException)
73       {
74         Throwable JavaDoc cause = ((WrappedException) throwable).getCause();
75         if (cause != null)
76           throwable = cause;
77       }
78     throw new ServletException(throwable);
79       }
80     ctx.consumer.endDocument();
81   }
82 }
83
84
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