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: /**
35: Implement casts.
36:
37: I think it should be possible to simplify some of the code here by
38: using the Types.getAssignableForm() method, but I haven't looked
39: into it.
40: */
41: class BSHCastExpression extends SimpleNode {
42:
43: public BSHCastExpression(int id) {
44: super (id);
45: }
46:
47: /**
48: @return the result of the cast.
49: */
50: public Object eval(CallStack callstack, Interpreter interpreter)
51: throws EvalError {
52: NameSpace namespace = callstack.top();
53: Class toType = ((BSHType) jjtGetChild(0)).getType(callstack,
54: interpreter);
55: SimpleNode expression = (SimpleNode) jjtGetChild(1);
56:
57: // evaluate the expression
58: Object fromValue = expression.eval(callstack, interpreter);
59: Class fromType = fromValue.getClass();
60:
61: // TODO: need to add isJavaCastable() test for strictJava
62: // (as opposed to isJavaAssignable())
63: try {
64: return Types.castObject(fromValue, toType, Types.CAST);
65: } catch (UtilEvalError e) {
66: throw e.toEvalError(this, callstack);
67: }
68: }
69:
70: }
|