01: /*****************************************************************************
02: * *
03: * This file is part of the BeanShell Java Scripting distribution. *
04: * Documentation and updates may be found at http://www.beanshell.org/ *
05: * *
06: * Sun Public License Notice: *
07: * *
08: * The contents of this file are subject to the Sun Public License Version *
09: * 1.0 (the "License"); you may not use this file except in compliance with *
10: * the License. A copy of the License is available at http://www.sun.com *
11: * *
12: * The Original Code is BeanShell. The Initial Developer of the Original *
13: * Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
14: * (C) 2000. All Rights Reserved. *
15: * *
16: * GNU Public License Notice: *
17: * *
18: * Alternatively, the contents of this file may be used under the terms of *
19: * the GNU Lesser General Public License (the "LGPL"), in which case the *
20: * provisions of LGPL are applicable instead of those above. If you wish to *
21: * allow use of your version of this file only under the terms of the LGPL *
22: * and not to allow others to use your version of this file under the SPL, *
23: * indicate your decision by deleting the provisions above and replace *
24: * them with the notice and other provisions required by the LGPL. If you *
25: * do not delete the provisions above, a recipient may use your version of *
26: * this file under either the SPL or the LGPL. *
27: * *
28: * Patrick Niemeyer (pat@pat.net) *
29: * Author of Learning Java, O'Reilly & Associates *
30: * http://www.pat.net/~pat/ *
31: * *
32: *****************************************************************************/package bsh;
33:
34: class BSHArguments extends SimpleNode {
35: BSHArguments(int id) {
36: super (id);
37: }
38:
39: /**
40: This node holds a set of arguments for a method invocation or
41: constructor call.
42:
43: Note: arguments are not currently allowed to be VOID.
44: */
45: /*
46: Disallowing VOIDs here was an easy way to support the throwing of a
47: more descriptive error message on use of an undefined argument to a
48: method call (very common). If it ever turns out that we need to
49: support that for some reason we'll have to re-evaluate how we get
50: "meta-information" about the arguments in the various invoke() methods
51: that take Object []. We could either pass BSHArguments down to
52: overloaded forms of the methods or throw an exception subtype
53: including the argument position back up, where the error message would
54: be compounded.
55: */
56: public Object[] getArguments(CallStack callstack,
57: Interpreter interpreter) throws EvalError {
58: // evaluate each child
59: Object[] args = new Object[jjtGetNumChildren()];
60: for (int i = 0; i < args.length; i++) {
61: args[i] = ((SimpleNode) jjtGetChild(i)).eval(callstack,
62: interpreter);
63: if (args[i] == Primitive.VOID)
64: throw new EvalError("Undefined argument: "
65: + ((SimpleNode) jjtGetChild(i)).getText(),
66: this, callstack);
67: }
68:
69: return args;
70: }
71: }
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