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/jEdit/tags/jedit-4-2-pre14/bsh/BSHCastExpression.java

#
Java | 70 lines | 19 code | 8 blank | 43 comment | 0 complexity | b559bf3f9e589cfc2313b7c525822430 MD5 | raw file
 1/*****************************************************************************
 2 *                                                                           *
 3 *  This file is part of the BeanShell Java Scripting distribution.          *
 4 *  Documentation and updates may be found at http://www.beanshell.org/      *
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 6 *  Sun Public License Notice:                                               *
 7 *                                                                           *
 8 *  The contents of this file are subject to the Sun Public License Version  *
 9 *  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 *
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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 *****************************************************************************/
33
34
35package bsh;
36
37/**
38	Implement casts.
39
40	I think it should be possible to simplify some of the code here by
41	using the Types.getAssignableForm() method, but I haven't looked 
42	into it.
43*/
44class BSHCastExpression extends SimpleNode {
45
46    public BSHCastExpression(int id) { super(id); }
47
48	/**
49		@return the result of the cast.
50	*/
51	public Object eval(
52		CallStack callstack, Interpreter interpreter ) throws EvalError
53    {
54		NameSpace namespace = callstack.top();
55        Class toType = ((BSHType)jjtGetChild(0)).getType( 
56			callstack, interpreter );
57		SimpleNode expression = (SimpleNode)jjtGetChild(1);
58
59        // evaluate the expression
60        Object fromValue = expression.eval(callstack, interpreter);
61        Class fromType = fromValue.getClass();
62
63		try {
64			return Types.castObject( fromValue, toType, Types.CAST );
65		} catch ( UtilEvalError e ) {
66			throw e.toEvalError( this, callstack  );
67		}
68    }
69
70}