Source code: com/tripi/asp/OutputNode.java
1 /**
2 * ArrowHead ASP Server
3 * This is a source file for the ArrowHead ASP Server - an 100% Java
4 * VBScript interpreter and ASP server.
5 *
6 * For more information, see http://www.tripi.com/arrowhead
7 *
8 * Copyright (C) 2002 Terence Haddock
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 *
24 */
25 package com.tripi.asp;
26
27 import java.io.IOException;
28
29 /**
30 * OutputNode handles the ASP notation <%= value %> to directly output
31 * an expression's value.
32 * @author Terence Haddock
33 * @version 0.9
34 */
35 public class OutputNode extends DefaultNode
36 {
37 /** Expression to output */
38 Node expr;
39
40 /** Debugging context, location of output node in asp code. */
41 DebugContext dbgCtx;
42
43 /**
44 * Constructor.
45 * @param expr Expression to output.
46 * @param dbgCtx Context of expression in ASP file.
47 */
48 public OutputNode(Object expr, DebugContext dbgCtx)
49 {
50 this.expr = (Node)expr;
51 }
52
53 /**
54 * Dumps the representation of this node.
55 * @throws AspException in case of error
56 * @see Node#dump
57 */
58 public void dump() throws AspException
59 {
60 System.out.print("<%=");
61 expr.dump();
62 System.out.print("%>");
63 }
64
65 /**
66 * Executes this output node.
67 * @param context AspContext under which to execute this node.
68 * @return return value, for this node always null
69 * @throws AspException in case of error
70 * @see Node#execute
71 */
72 public Object execute(AspContext context) throws AspException
73 {
74 final IdentNode respIdent = new IdentNode("response");
75 try {
76 Object obj = expr.execute(context);
77 String str = Types.coerceToString(obj);
78 JavaObjectNode respObj = (JavaObjectNode)context.getValue(respIdent);
79 Response resp = (Response)respObj.getSubObject();
80 resp.Write(str);
81 } catch (IOException ex) {
82 throw new AspNestedException(ex, dbgCtx);
83 } catch (AspException ex) {
84 if (!ex.hasContext()) {
85 ex.setContext(dbgCtx);
86 }
87 throw ex;
88 }
89 return null;
90 }
91 };
92